Pima County, Arizona, USA (original) (raw)

Description: Plagioclase in the andesine-labradorite range. Phenocrysts to 2 inches in intrusive & flow porphyritic rocks, locally termed 'Turkey Track' porphyry.

ⓘ Anthophyllite

Formula: ◻{Mg2}{Mg5}(Si8O22)(OH)2

Localities:

Blue Jay Mine, Blue Jay-Good Friday Mines, Sycamore Canyon, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Kielberg's Iron Mountain claim, Pima County, Arizona, USA

ⓘ Antigorite

Formula: Mg3(Si2O5)(OH)4

ⓘ Antimony

Formula: Sb

ⓘ Antlerite

Formula: Cu3(SO4)(OH)4

ⓘ 'Apatite'

Formula: Ca5(PO4)3(Cl/F/OH)

Localities: Reported from at least 6 localities in this region.

Description: Minor amounts in altered rock.

ⓘ 'Apophyllite Group'

Formula: A B4[Si8O22]X · 8H2O

Localities: Reported from at least 6 localities in this region.

ⓘ Aragonite

Formula: CaCO3

Localities: Reported from at least 9 localities in this region.

Description: Occurs as large fibrous and stalactitic masses.

ⓘ 'Asbestos'

Localities:

Rosemont Mine, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Unnamed Asbestos occurrence (2), Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Unnamed Asbestos occurrence (3), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

ⓘ Atacamite

Formula: Cu2(OH)3Cl

Localities: Reported from at least 8 localities in this region.

ⓘ Augite

Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Batamote Crater, Batamote Mountains, Pima County, Arizona, USA
Unnamed smelter slag locality, Gunsight Pass, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA

Description: Rock forming minerals

ⓘ Aurichalcite

Formula: (Zn,Cu)5(CO3)2(OH)6

Localities: Reported from at least 15 localities in this region.

ⓘ Autunite

Formula: Ca(UO2)2(PO4)2 · 10-12H2O

Localities:

Van Hill No. 5 claim, Van Hill claims (Van Hill Nos. 1-8; Bluerock Mine; Blue State Mine; Vanover property), Redington quadrangle, Redington Mining District, Pima County, Arizona, USA
Sure Fire No. 1 claim (Sure Fire claim; Vanover property), Bar-LY Ranch, Redington Mining District, Pima County, Arizona, USA

ⓘ Axinite-(Mn)

Formula: Ca2Mn2+Al2BSi4O15(OH)

Habit: Plates

Colour: Yellow

Description: Occurs in vesicles in andesite flow boulders being replaced by withamite variety of clinozoisite.

ⓘ Azurite

Formula: Cu3(CO3)2(OH)2

Localities: Reported from at least 69 localities in this region.

Habit: Blocky, tabular, terminated

Colour: Azure-blue

Fluorescence: None

Description: Exceptionally sharp crystals common in gossan cavities and fissures.

ⓘ Baryte

Formula: BaSO4

Localities: Reported from at least 67 localities in this region.

Habit: Rosette-shaped aggregates to 15 cm

Colour: Pink

ⓘ Bassanite

Formula: Ca(SO4) · 0.5H2O

Habit: Tiny, sub-hedral, fibrous crystals

Description: Occurs in veinlets filled with quartz in hydrothermally altered diorite and quartz diorite porphyry.

ⓘ Bayldonite

Formula: PbCu3(AsO4)2(OH)2

ⓘ Beidellite

Formula: (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Concentrator Hill, New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA

Description: Pseudomorphic replacements of plagioclase phenocrysts in outlying parts of mineralized area. Occurs also in zone of oxidation coating malachite.

ⓘ Beryl

Formula: Be3Al2(Si6O18)

Localities: Reported from at least 6 localities in this region.

Description: Occurs in a vein in granite.

ⓘ Beudantite

Formula: PbFe3(AsO4)(SO4)(OH)6

Localities:

Silver Hill Mine group, Silver Hill, Silver Hill Mining District, Waterman Mining District, Pima County, Arizona, USA
Saginaw Hill (Saginaw property), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
South side of Saginaw Hill, Amole Mine group, Saginaw Hill (Saginaw property), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA

ⓘ Bieberite

Formula: CoSO4 · 7H2O

Colour: Pink

Description: Efflorescences on side of ditch draining approach to the pit.

ⓘ 'Bindheimite'

Formula: Pb2Sb2O6O

Localities:

Frijole prospect, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Silver Hill Mine group, Silver Hill, Silver Hill Mining District, Waterman Mining District, Pima County, Arizona, USA
Snyder Hill Mine (Snyder Hill prospect), Snyder Hill, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA

ⓘ 'Biotite'

Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

Localities: Reported from at least 14 localities in this region.

Description: Rock forming mineral. Occurs in the Cardigan gneiss, Concentrator volcanics, and Cornelia quartz monzonite. A little broadleaved material associated with pegmatized part of the Cornelia quartz monzonite in the orebody.

ⓘ 'Bisbeeite'

Formula: (Cu,Mg)SiO3 · nH2O

ⓘ Bismuth

Formula: Bi

ⓘ Bismuthinite

Formula: Bi2S3

ⓘ Bismutite

Formula: (BiO)2CO3

ⓘ Bornite

Formula: Cu5FeS4

Localities: Reported from at least 54 localities in this region.

ⓘ Bornite var. Silver-bearing Bornite

Formula: (Cu,Ag)5FeS4

ⓘ Bournonite

Formula: PbCuSbS3

Localities:

Dimple Mine group, Mount Fagan, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Busterville Mine, Avra, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA

ⓘ Braunite

Formula: Mn2+Mn3+6(SiO4)O8

Localities:

Baboquivari Mountains, Pima County, Arizona, USA
COD Mine, Arivaca Mining District (Las Guijas Mining District), Las Guijas & San Luis Mountains, Pima County, Arizona, USA
Coyote Mountains, Pima County, Arizona, USA
Juan Santa Cruz picnic grounds, Tucson Mountains, Pima County, Arizona, USA
Silver Hill Mine group, Silver Hill, Silver Hill Mining District, Waterman Mining District, Pima County, Arizona, USA

ⓘ Brezinaite (TL)

Formula: Cr3S4

Type Locality:

Description: Occurs in iron meteorite as tiny (5-80 micron) anhedral grains in metal matrix & contiguous to silicate inclusions.

ⓘ Brochantite

Formula: Cu4(SO4)(OH)6

Localities: Reported from at least 15 localities in this region.

ⓘ Brookite

Formula: TiO2

Habit: Minute, less than 0.01 mm diameter

Description: Rock forming mineral. Replacing titanite in a single sample from a drill core in quartz monzonite.

ⓘ Buttgenbachite

Formula: Cu19(NO3)2(OH)32Cl4 · 2H2O

Localities:

Description: Product of oxidation of sulfide ores. Occurs in quartz veins cutting andesite.

ⓘ Cacoxenite

Formula: Fe3+24AlO6(PO4)17(OH)12 · 75H2O

Localities:

El Tiro Mine, Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Oxide Mine, Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

Description: Occurs coating torbernite with turquoise.

ⓘ Calcite

Formula: CaCO3

Localities: Reported from at least 138 localities in this region.

ⓘ Calcite var. Limestone Onyx

Formula: CaCO3

Colour: Brown

Description: Occurs as brown travertine.

ⓘ Calcite var. Manganese-bearing Calcite

Formula: (Ca,Mn)CO3

ⓘ Caledonite

Formula: Pb5Cu2(SO4)3(CO3)(OH)6

Localities:

Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Golden Cross Mine, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

Habit: Single anhedra to 25 mm diameter

Description: Occurs surrounded by cerussite altering to malachite.

ⓘ Carminite

Formula: PbFe3+2(AsO4)2(OH)2

Localities:

ⓘ Carnotite

Formula: K2(UO2)2(VO4)2 · 3H2O

ⓘ Cerussite

Formula: PbCO3

Localities: Reported from at least 52 localities in this region.

ⓘ 'Chabazite'

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Phelps Dodge Corporation Well No. 1, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA

ⓘ Chalcanthite

Formula: CuSO4 · 5H2O

Localities: Reported from at least 9 localities in this region.

ⓘ Chalcocite

Formula: Cu2S

Localities: Reported from at least 104 localities in this region.

Description: Relatively small amounts; disseminated in narrow band bordering the southern part of the orebody.

ⓘ Chalcocite var. Silver-bearing Chalcocite

Formula: (Cu,Ag)2S

Localities:

Yellow Bird Mine, Lincoln Mine group, Stevens Mountain, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
Providence Mine, Lincoln Mine group, Stevens Mountain, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA

ⓘ Chalcopyrite

Formula: CuFeS2

Localities: Reported from at least 234 localities in this region.

ⓘ Chamosite

Formula: (Fe2+)5Al(Si,Al)4O10(OH,O)8

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Chicago Mine, Sells, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA

ⓘ Chlorargyrite

Formula: AgCl

Localities: Reported from at least 34 localities in this region.

ⓘ 'Chlorite Group'

Localities: Reported from at least 42 localities in this region.

ⓘ Chrysocolla

Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1

Localities: Reported from at least 80 localities in this region.

ⓘ Cinnabar

Formula: HgS

Localities: Reported from at least 9 localities in this region.

Description: Traces.

ⓘ 'Clay minerals'

Localities: Reported from at least 16 localities in this region.

ⓘ Clinochlore

Formula: Mg5Al(AlSi3O10)(OH)8

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Linda Lee claims, Quijotoa (Covered Wells), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA
Mount Fagan, Pima County, Arizona, USA
Ajo Mining District, Pima County, Arizona, USA

ⓘ Clinochlore var. Diabantite

Formula: (Mg,Fe,Al)6((Si,Al)4O10)(OH)8

Description: In Cornelia quartz monzonite.

ⓘ Clinochlore var. Pennine

Formula: Mg5Al(AlSi3O10)(OH)8

ⓘ 'Clinoptilolite Subgroup'

Formula: M3-6(Si30Al6)O72 · 20H2O

Localities:

Phelps Dodge Corporation Well No. 1, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Sikort Chuapa Mountains, Pima County, Arizona, USA
Ajo Mountains Zeolite occurrence, Ajo Mountains, Organ Pipe Cactus National Monument, Pima County, Arizona, USA
Cerro Colorado Zeolite occurrence (Cerro Colorado Clinoptilolite), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA

ⓘ Clinozoisite

Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH)

Localities:

Kovaya Hills area, Kovaya Hills, Comobabi Mountains, Pima County, Arizona, USA
Silver Leaf Mine, Greaterville Mining District, Pima County, Arizona, USA
New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA ? (more information)

Description: Occurs as vesicle fillings in andesite flow boulders. Variety withamite.

ⓘ Cobaltite

Formula: CoAsS

ⓘ Columbite-(Fe)

Formula: Fe2+Nb2O6

Localities:

Valentine 1 claim, San Antonio group of claims, Chico Shunie, Chico Shunie Hills, Ajo Mining District, Pima County, Arizona, USA
Valentine 2 claim, San Antonio group of claims, Chico Shunie, Chico Shunie Hills, Ajo Mining District, Pima County, Arizona, USA
Valentine 3 claim, San Antonio group of claims, Chico Shunie, Chico Shunie Hills, Ajo Mining District, Pima County, Arizona, USA

ⓘ Conichalcite

Formula: CaCu(AsO4)(OH)

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Rosemont (Rosemont Camp), Helvetia-Rosemont Mining District, Pima County, Arizona, USA

ⓘ Connellite

Formula: Cu19(SO4)(OH)32Cl4 · 3H2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Daisy Mine (Daisy shaft), Mineral Hill Mines (Azurite group; Old Azurite Mine; Copper Glance Mine), Mineral Hill, Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

Description: Occurs in vugs with cuprite.

ⓘ Copiapite

Formula: Fe2+Fe3+4(SO4)6(OH)2 · 20H2O

Description: Silky fibers & foliated masses.

ⓘ Copper

Formula: Cu

Localities: Reported from at least 26 localities in this region.

Description: Abundant as an oxidation product.

ⓘ 'Copper Stain'

Localities: Reported from at least 136 localities in this region.

ⓘ Coquimbite

Formula: AlFe3(SO4)6(H2O)12 · 6H2O

ⓘ Cornetite

Formula: Cu3(PO4)(OH)3

Localities:

Colour: Light peacock-blue; deep blue, deep greenish-blue

Description: Well-crystallized, fine-grained, soft clusters plastering fracture surfaces in chert or chert gangue; as clear crystal aggregates & darker crystalline clots.

ⓘ Covellite

Formula: CuS

Localities: Reported from at least 23 localities in this region.

Description: Occurs as minute blebs in chalcocite veinlets and coatings on other copper minerals, especially chalcopyrite.

ⓘ Cristobalite

Formula: SiO2

Description: Occurs in cavities in andesite.

ⓘ Crocoite

Formula: PbCr6+O4

Localities:

ⓘ Cubanite

Formula: CuFe2S3

ⓘ Cuprite

Formula: Cu2O

Localities: Reported from at least 44 localities in this region.

Description: Abundant; miners made baseballs from chalcotrichite. Occurs with supergene hematite, malachite, chrysocolla and copper in the old weathered zone of the orebody that lies beneath the Locomotive fanglomerate

ⓘ Cuprite var. Chalcotrichite

Formula: Cu2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Ajo Mining District, Pima County, Arizona, USA
Mission pit, Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Silver Bell Mountains, Pima County, Arizona, USA

Description: Abundant; miners made baseballs out of this material.

ⓘ Cuprorivaite

Formula: CaCuSi4O10

Description: On a brick from the smelter.

ⓘ Cuprotungstite

Formula: Cu2(WO4)(OH)2

Localities:

Omega Mine, Monument Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Copper World Mine, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA

ⓘ Datolite

Formula: CaB(SiO4)(OH)

Localities:

Pima Mine, Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Rosemont District - Southern half, Helvetia-Rosemont Mining District, Pima County, Arizona, USA

Description: Occurs in thin veins in diopside-garnet tactites as micro-material.

ⓘ 'Davidite'

Localities:

Quijotoa (Covered Wells), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA
Linda Lee claims, Quijotoa (Covered Wells), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA

Description: Occurs as dark, pitchy-lustered masses in a matrix of feldspar and titanite.

ⓘ Davidite-(La)

Formula: La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38

Colour: Dark brown

Description: Pitchy-lustered masses in matrix; nearly entirely metamict.

ⓘ 'Delessite'

Formula: (Mg,Fe,Fe,Al)(Si,Al)4O10(O,OH)8

ⓘ Descloizite

Formula: PbZn(VO4)(OH)

Localities:

Old Yuma Mine (Yuma Mine), Tucson Mountain District Saguaro National Park, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Sammy Dog Mine, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Total Wreck Mine, Cienega Creek, The Narrows, Empire Mining District, Empire Mountains, Pima County, Arizona, USA

Habit: Rare crystals to 5mm long

Colour: Brownish-orange

ⓘ Devilline

Formula: CaCu4(SO4)2(OH)6 · 3H2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Steppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA

ⓘ Devilline var. Zinc-bearing Devilline

Formula: Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O

Description: Occurs in quartz veins cutting andesite.

ⓘ Diaspore

Formula: AlO(OH)

ⓘ Digenite

Formula: Cu9S5

ⓘ Diopside

Formula: CaMgSi2O6

Localities: Reported from at least 19 localities in this region.

ⓘ Dioptase

Formula: CuSiO3 · H2O

ⓘ Djurleite

Formula: Cu31S16

Localities:

ASARCO claims, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Rosemont (Rosemont Camp), Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Kinoite type locality drill hole, Helvetia-Rosemont Mining District, Pima County, Arizona, USA

ⓘ Dolomite

Formula: CaMg(CO3)2

Localities: Reported from at least 13 localities in this region.

Description: A little found in ores as linings in drusy cavities. Older than calcite & coats chlorite.

ⓘ Dolomite var. Zinc-bearing Dolomite

Formula: Ca(Mg,Zn)(CO3)2

ⓘ Domitrovicite (TL)

Formula: Zn(C2H3O3)2 · 2H2O

Type Locality:

References:

Yang, H., Kampf, A.R., Gu, X., Lazar, W., Gibbs, R.B. and Downs, R.T. (2024) Domitrovicite, IMA 2023-125

ⓘ Duftite

Formula: PbCu(AsO4)(OH)

Localities:

Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Chief Mine, Prince Mine group, Hilton Mines, Copper Camp, Hilton (Lead Mountain), Empire Mining District, Empire Mountains, Pima County, Arizona, USA

ⓘ Dyscrasite

Formula: Ag3Sb

Description: A secondary mineral in quartz diorite.

ⓘ Enargite

Formula: Cu3AsS4

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Esperanza Mine [new] (Esperanza pit; Esperanza open pit mines; West Esperanza Mine), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

ⓘ Enstatite

Formula: Mg2Si2O6

Localities:

Tucson meteorite (Irwin-Ainsa meteorite), Box Canyon, Pima County, Arizona, USA
Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Ajo Mining District, Pima County, Arizona, USA
Phelps Dodge Corporation Well No. 1, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Batamote Crater, Batamote Mountains, Pima County, Arizona, USA

ⓘ Epidote

Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)

Localities: Reported from at least 95 localities in this region.

Description: With specularite in extreme NW corner of the orebody, coats specularite in vugs. Secondary alteration product of anorthite component of plagioclase along with sericite and albite.

ⓘ Epsomite

Formula: MgSO4 · 7H2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
El Tiro Mine, Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

Description: Occurs in the oxidized portion of the orebody; possible post-mining product.

ⓘ Erionite-Ca

Formula: (Ca,K2,Na2)2[Al4Si14O36] · 15H2O

ⓘ 'Erionite Subgroup'

Formula: M2[Al4Si14O36] · 15H2O

ⓘ Euxenite-(Y)

Formula: (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6

ⓘ 'Feldspar Group'

Localities: Reported from at least 7 localities in this region.

ⓘ Ferrierite-Na

Formula: (Na,K)5(Si31Al5)O72 · 18H2O

ⓘ 'Ferrierite Subgroup'

Description: Occurs is a dike with calcite and zeolites.

ⓘ Ferrimolybdite

Formula: Fe2(MoO4)3 · nH2O

Localities: Reported from at least 6 localities in this region.

ⓘ Fluorapatite

Formula: Ca5(PO4)3F

Habit: Commonly euhedral and stumpy

Description: Rock forming mineral. Occurs only as an accessory mineral in igneous rocks, including the Cornelia quartz monzonite.

ⓘ Fluorite

Formula: CaF2

Localities: Reported from at least 34 localities in this region.

ⓘ Fornacite

Formula: Pb2Cu(CrO4)(AsO4)(OH)

Localities: Reported from at least 6 localities in this region.

Description: Occurs on hematite and quartz.

ⓘ Forsterite

Formula: Mg2SiO4

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Tucson meteorite (Irwin-Ainsa meteorite), Box Canyon, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

Description: Rock forming mineral.

ⓘ 'Freibergite Subgroup'

Formula: (Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1

Localities:

Cerro Colorado Mine (Heintzelman Mine; Silver Queen Mine), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
New Colorado Mine, Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA

ⓘ Galena

Formula: PbS

Localities: Reported from at least 161 localities in this region.

ⓘ Galena var. Silver-bearing Galena

Formula: PbS with Ag

Localities: Reported from at least 28 localities in this region.

ⓘ 'Garnet Group'

Formula: X3Z2(SiO4)3

Localities: Reported from at least 65 localities in this region.

ⓘ Gerhardtite

Formula: Cu2(NO3)(OH)3

Description: Occurs as thin semas of granular material in cuprite, coated by aurichalcite.

ⓘ Glecklerite (TL)

Formula: Na(C2H3O3)

Type Locality:

ⓘ Goethite

Formula: α-Fe3+O(OH)

Localities: Reported from at least 16 localities in this region.

Description: Occurs as fine, earthy powders; a constituent of a yellow-brown to deep brown limonitic crust on the rusty outcrops of the oxidized part of the orebody.

ⓘ Gold

Formula: Au

Localities: Reported from at least 89 localities in this region.

Description: Cementing some fractures in bornite.

ⓘ Gonnardite

Formula: (Na,Ca)2(Si,Al)5O10 · 3H2O

ⓘ Goslarite

Formula: ZnSO4 · 7H2O

Localities:

Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Steppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
University Mine (SX mine - shaft No. 7), Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

ⓘ Goslarite var. Cuprogoslarite

Formula: ZnSO4 · 7H2O

Description: Occurs in old mine workings.

ⓘ Grossular

Formula: Ca3Al2(SiO4)3

Localities:

Atlas Mine, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Peach-Elgin copper deposit, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Pima Mine, Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

Description: Abundant in tactites result of pyrometasomatic alteration of limestone.

ⓘ 'Gummite'

Description: Occurs in a vein cutting arkose.

ⓘ Gypsum

Formula: CaSO4 · 2H2O

Localities: Reported from at least 40 localities in this region.

ⓘ Gypsum var. Satin Spar Gypsum

Formula: CaSO4 · 2H2O

ⓘ Gypsum var. Selenite

Formula: CaSO4 · 2H2O

Localities: Reported from at least 6 localities in this region.

ⓘ Halite

Formula: NaCl

Description: A little with epsomite and its dehydration products.

ⓘ Hausmannite

Formula: Mn2+Mn3+2O4

Description: Forms veinlets cutting a matrix of braunite.

ⓘ Hedenbergite

Formula: CaFe2+Si2O6

Localities:

Atlas Mine, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
San Xavier Mine (San Xavier Mine shaft), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Senator Morgan Mine group, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

ⓘ Hematite

Formula: Fe2O3

Localities: Reported from at least 107 localities in this region.

Description: Earthy variety of supergene origin.

ⓘ Hematite var. Specularite

Formula: Fe2O3

Localities: Reported from at least 47 localities in this region.

ⓘ Hemimorphite

Formula: Zn4Si2O7(OH)2 · H2O

Localities: Reported from at least 10 localities in this region.

ⓘ 'Heulandite Subgroup'

Formula: (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O

Localities:

Description: Occurs in a dike with calcite and ferrierite.

ⓘ Hisingerite

Formula: Fe3+2(Si2O5)(OH)4 · 2H2O

Localities:

ⓘ Hollandite

Formula: Ba(Mn4+6Mn3+2)O16

ⓘ 'Hornblende Root Name Group'

Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Iron Mask Mine (Iron Mask prospect; McCleary prospect; Littleshot prospect), Jackson Mine group (McCleary group; Old Baldy Copper Mine; Rosa Mine; Hickory; Decatur), Jackson Canyon, Old Baldy Mining District, Pima County, Arizona, USA
Prince Mine group, Hilton Mines, Copper Camp, Hilton (Lead Mountain), Empire Mining District, Empire Mountains, Pima County, Arizona, USA
Rincon Mining District, Pima County, Arizona, USA

Description: Rock forming minerals. Often partially to completely altered to chlorite.

ⓘ Hübnerite

Formula: MnWO4

Localities:

Las Guijas Mine group (Immense Lode; Grand Lode; General Electric Mine; General Electric group of claims; Obregon claims; Black Gold group), Las Guijas Mountains, Arivaca Mining District (Las Guijas Mining District), Las Guijas & San Luis Mountains, Pima County, Arizona, USA
Las Guijas Mountains, Arivaca Mining District (Las Guijas Mining District), Las Guijas & San Luis Mountains, Pima County, Arizona, USA

ⓘ Huntite

Formula: CaMg3(CO3)4

Description: As nodular masses in altered limestone with magnesite & as micro-crystals.

ⓘ Hydrohalloysite

Formula: Al2Si2O5(OH)4 · 2H2O

ⓘ Hydrozincite

Formula: Zn5(CO3)2(OH)6

ⓘ 'Hypersthene'

Formula: (Mg,Fe)SiO3

Description: As the enstatite-hypersthene series.

ⓘ Ilmenite

Formula: Fe2+TiO3

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Ajo Mining District, Pima County, Arizona, USA
Stepp - Laive occurrence, Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA
Horseshoe Basin occurrence (Ballam occurrence), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA
Batamote Crater, Batamote Mountains, Pima County, Arizona, USA

Description: A little is associated with magnetite as primary accessory constituent of the Cornelia quartz monzonite; much formed as alteration of titanite during ore deposition.

ⓘ Iodargyrite

Formula: AgI

Localities:

Cerro Colorado Mine (Heintzelman Mine; Silver Queen Mine), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Steppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA

ⓘ 'Iridescent coating'

Localities:

Unnamed copper mine, Deer Creek, Pima County, Arizona, USA
Yuba Mine (Inghram Mine), Hughes Gulch, Greaterville placer deposits, Greaterville, Greaterville Mining District, Pima County, Arizona, USA

ⓘ Iron

Formula: Fe

ⓘ Iron var. Kamacite

Formula: (Fe,Ni)

ⓘ Jarosite

Formula: KFe3+3(SO4)2(OH)6

Localities: Reported from at least 23 localities in this region.

ⓘ 'Jasper'

Localities:

Old Mission Mine (Old Bat Mine), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
Glen claims, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
Unnamed Mn prospect Vhne-031n, Vaca Hills, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Rincon Mining District, Pima County, Arizona, USA
Marsh Station vicinity, Pima County, Arizona, USA

ⓘ Jimkrieghite (TL)

Formula: Ca(C2H3O3)2

Type Locality:

ⓘ Kaolinite

Formula: Al2(Si2O5)(OH)4

Localities: Reported from at least 16 localities in this region.

ⓘ Kasolite ?

Formula: Pb(UO2)(SiO4) · H2O

Localities:

Lena No. 1 - 11 claims, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA ? (more information)
Iris and Natalia claims, Oro Blanco Mining District (Ruby Mining District), Oro Blanco Mountains, Pima County, Arizona, USA ? (more information)

ⓘ 'K Feldspar'

Localities:

Unnamed Cu-Mo prospect Vhne-078n, Vaca Hills, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Unnamed Cu-Fe prospect 118-24, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA ? (more information)

ⓘ Kinoite (TL)

Formula: Ca2Cu2(H2O)2[Si3O10]

Localities: Reported from at least 6 localities in this region.

ⓘ Laumontite

Formula: CaAl2Si4O12 · 4H2O

Localities:

Habit: Crystals elongate

Colour: Pink

Description: Occurs with calcite in andesite dikes.

ⓘ Lazaraskeite (TL)

Formula: Cu(C2H3O3)2

Type Locality:

ⓘ Lazulite

Formula: MgAl2(PO4)2(OH)2

ⓘ Leadhillite

Formula: Pb4(CO3)2(SO4)(OH)2

Localities:

ⓘ Lechatelierite

Formula: SiO2

ⓘ Lepidocrocite

Formula: γ-Fe3+O(OH)

Localities:

Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Steppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Omega Mine, Monument Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Unnamed copper mine, Deer Creek, Pima County, Arizona, USA

ⓘ Leucosphenite

Formula: BaNa4Ti2B2Si10O30

Habit: Micro-crystals

ⓘ Lianbinite (TL)

Formula: (NH4)(C2H3O3)(C2H4O3)

Type Locality:

ⓘ Libethenite

Formula: Cu2(PO4)(OH)

Localities: Reported from at least 11 localities in this region.

ⓘ 'Limonite'

Localities: Reported from at least 172 localities in this region.

ⓘ Linarite

Formula: PbCu(SO4)(OH)2

Localities:

Banner Mine group (Banner Mine; Hughes Mine), Stevens Mountain, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA

Description: Micro-crystals assoc. with brochantite.

ⓘ Lindgrenite

Formula: Cu3(MoO4)2(OH)2

Description: Very sparse.

ⓘ Litharge

Formula: PbO

Localities:

Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Steppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Weldon Mine, Ben Nevis Mountain, Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA

ⓘ Lizardite

Formula: Mg3(Si2O5)(OH)4

ⓘ Ludwigite

Formula: Mg2Fe3+(BO3)O2

Description: Occurs in a contact zone.

ⓘ Maghemite

Formula: (Fe3+0.67◻0.33)Fe3+2O4

Description: Occurs as a thin, brownish surface as an alteration product on magnetite pebbles and boulders.

ⓘ Magnesio-hornblende

Formula: ◻Ca2(Mg4Al)(Si7Al)O22(OH)2

Localities:

Vail vicinity, Pima County, Arizona, USA
Ajo Mining District, Pima County, Arizona, USA
Prince Mine group, Hilton Mines, Copper Camp, Hilton (Lead Mountain), Empire Mining District, Empire Mountains, Pima County, Arizona, USA
Quinlan Mountains, Pima County, Arizona, USA

ⓘ Magnesite

Formula: MgCO3

ⓘ Magnetite

Formula: Fe2+Fe3+2O4

Localities: Reported from at least 61 localities in this region.

Habit: discrete euhedral octahedra commonly a fraction of a mm diameter (in quartz monzonite)

Description: Appears to be of 2 generations. Older generation is a primary constituent of the Cornelia quartz monzonite; younger generation as veinlets (very thin to 4 inches (10 cm) thick, associated with pegmatites in the ore deposit

ⓘ Malachite

Formula: Cu2(CO3)(OH)2

Localities: Reported from at least 197 localities in this region.

ⓘ 'Manganese Oxides'

Localities:

Saginaw Hill (Saginaw property), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
Chief Mine, Prince Mine group, Hilton Mines, Copper Camp, Hilton (Lead Mountain), Empire Mining District, Empire Mountains, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Unnamed copper mine, Deer Creek, Pima County, Arizona, USA
Sammy Dog Mine, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

ⓘ 'Manganese Oxides var. Manganese Dendrites'

Localities:

Saginaw Hill (Saginaw property), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
Unnamed copper mine, Deer Creek, Pima County, Arizona, USA
Sammy Dog Mine, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

ⓘ Manganite

Formula: Mn3+O(OH)

Localities:

Stella Maris No. 1 Mine (Drew Springs Mine; Black Widow Mine), Sheridan Mountains, Cimarron Mining District (Salt Well Mining District), Cimarron & Sheridan Mountains, Pima County, Arizona, USA
Black Jack Mine, Drew Spring Well, Sheridan Mountains, Cimarron Mining District (Salt Well Mining District), Cimarron & Sheridan Mountains, Pima County, Arizona, USA

ⓘ Marcasite

Formula: FeS2

Localities: Reported from at least 10 localities in this region.

Description: Occurs as an alteration product of pyrrhotite

ⓘ Massicot

Formula: PbO

Localities:

Steppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Silver-Lead claim, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA

Colour: Yellow

Description: Earthy alteration product of galena.

ⓘ Matlockite

Formula: PbFCl

Description: Occurs as a single crystal in parallel growth with a prismatic anglesite crystal.

ⓘ 'Medmontite'

ⓘ Melanterite

Formula: Fe2+(H2O)6SO4 · H2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
San Xavier pit (San Xavier open pit; San Xavier West Mine; San Xavier Unit Open pit), Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
El Tiro Mine, Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

ⓘ Melanterite var. Copper-bearing Melanterite

Formula: (Fe,Cu)SO4 · 7H2O

Description: Occurs in small amounts.

ⓘ Mercury

Formula: Hg

ⓘ Meta-alunogen

Formula: Al2(SO4)3 · 12H2O

Description: Forms crusts from a seep with gypsum.

ⓘ Metatorbernite

Formula: Cu(UO2)2(PO4)2 · 8H2O

Localities:

Papago Chief Mine (Napoleon Mine), Baboquivari Mining District, Baboquivari Mountains, Pima County, Arizona, USA
Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Unnamed prospect, Linda Lee claims area, Quijotoa (Covered Wells), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA

Description: Occurs with other copper minerals.

ⓘ 'Mica Group'

Localities:

Tinker Bell prospect (J and D prospect), Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Mica Mine, Pima County, Arizona, USA
Cienega Gap area, Pima County, Arizona, USA

ⓘ Microcline

Formula: K(AlSi3O8)

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Linda Lee claims, Quijotoa (Covered Wells), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA ? (more information)

Habit: Coarse; anhedral in the pegmatites; in vugs crystals to 3 or 4 inches (5 to 10 cm) across with well-developed domes & clinopinacoids.

Description: Occurs in the south-central part of the orebody as coarse crystals in the pegmatite masses; sparsely distributed individual grains in normal quartz monzonite & in narrow veins.

ⓘ Miersite

Formula: (Ag,Cu)I

Localities:

ⓘ Mimetite

Formula: Pb5(AsO4)3Cl

Localities: Reported from at least 6 localities in this region.

Description: Micro-crystals occur with wulfenite.

ⓘ Minium

Formula: Pb3O4

Localities: Reported from at least 6 localities in this region.

Description: As coatings on wulfenite.

ⓘ Molybdenite

Formula: MoS2

Localities: Reported from at least 60 localities in this region.

Description: In vugs and open fissures resting on chalcopyrite crystals and quartz; smears on slickensided joints.

ⓘ 'Molybdenite-2H'

Formula: MoS2

ⓘ 'Monazite Group'

Formula: REE(PO4)

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Papago Wells, Agua Dulce Mining District, Agua Dulce Mountains, Pima County, Arizona, USA

Description: Rock forming minerals

ⓘ Montmorillonite

Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O

Localities:

Silver Bell area, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Esperanza Mine [new] (Esperanza pit; Esperanza open pit mines; West Esperanza Mine), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Saginaw Hill (Saginaw property), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA

Description: An alteration product replacing feldspar in dacite.

ⓘ Mordenite

Formula: (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O

Description: Occurs in altered tuff.

ⓘ Mottramite

Formula: PbCu(VO4)(OH)

Localities: Reported from at least 10 localities in this region.

ⓘ Murdochite

Formula: Cu12Pb2O15Cl2

ⓘ Muscovite

Formula: KAl2(AlSi3O10)(OH)2

Localities: Reported from at least 86 localities in this region.

Description: As 'books' of broadleaved, rather coarsely crystalline material in the Cardigan gneiss and associated pegmatites.

ⓘ Muscovite var. Fuchsite

Formula: K(Al,Cr)3Si3O10(OH)2

ⓘ Muscovite var. Illite

Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2

ⓘ Muscovite var. Sericite

Formula: KAl2(AlSi3O10)(OH)2

Localities: Reported from at least 71 localities in this region.

Description: Occurs in altered Laramide granitic intrusive.

ⓘ Neotocite

Formula: (Mn,Fe)SiO3 · H2O (?)

Colour: Black

Description: Occurs as dendrites.

ⓘ Nepheline

Formula: Na3K(Al4Si4O16)

Localities:

Description: Occurs in nepheline syenite in an exploratory drill hole.

ⓘ Nontronite

Formula: Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O

Localities:

Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Ajo Mining District, Pima County, Arizona, USA
Pauline Mine, Mount Fagan, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Arkansas Mountain, New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA

Description: Occurs in the supergene zone in collapse breccias.

ⓘ Olivenite

Formula: Cu2(AsO4)(OH)

Description: Occurs as small crystals with ajoite.

ⓘ Opal

Formula: SiO2 · nH2O

Localities: Reported from at least 9 localities in this region.

ⓘ Opal var. Opal-AN

Formula: SiO2 · nH2O

Localities:

Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Bulldozer Hill, Tiptop Mine group (Tiptop Camp prospects/mines), Tiptop Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Old Yuma Mine (Yuma Mine), Tucson Mountain District Saguaro National Park, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA

ⓘ Orthoclase

Formula: K(AlSi3O8)

Localities: Reported from at least 9 localities in this region.

Habit: Crystals to several inches diameter

Description: Part of a massive replacement of quartz monzonite; phenocrysts in the Cornelia quartz monzonite & minute crystals in the groundmass of the monzonite. Primary igneous mineral and secondary replacements of groundmass.

ⓘ Osarizawaite

Formula: Pb(Al2Cu2+)(SO4)2(OH)6

Localities:

Silver Hill Mine group, Silver Hill, Silver Hill Mining District, Waterman Mining District, Pima County, Arizona, USA
Omega Mine, Monument Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA

Colour: Blue

Description: Attractive massive to micro-crystalline material.

ⓘ Osumilite-(Mg)

Formula: K◻2Mg2Al3[Al2Si10O30]

ⓘ Oxyplumboroméite

Formula: Pb2Sb2O6O

ⓘ Palygorskite

Formula: ◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O

Localities:

ⓘ Papagoite (TL)

Formula: CaCu[H3AlSi2O9]

Type Locality:

Habit: Elongated, somewhat flattened crystals

Colour: Cerulean-blue

Description: Occurs in narrow veinlets & in veneers on slip surfaces in altered granodiorite porphyry.

ⓘ Paratacamite

Formula: Cu3(Cu,Zn)(OH)6Cl2

Description: Fibrous & granular masses embaying linarite & as pseudomorphs after atacamite in quartz veins cutting andesite.

ⓘ Perovskite

Formula: CaTiO3

Description: Occurs as polysynthetically twinned cores of titanite crystals.

ⓘ 'Phillipsite Subgroup'

ⓘ Phlogopite

Formula: KMg3(AlSi3O10)(OH)2

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Phelps Dodge Corporation Well No. 1, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

ⓘ Piemontite

Formula: (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)

Localities: Reported from at least 6 localities in this region.

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi2]O8

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Area West of Helmet Peak, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Saginaw Hill (Saginaw property), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA

Description: Rock forming minerals - wide range of compositions. Primary plagioclase of both the Concentrator volcanics & Cornelia quartz monzonite is largely andesine, although some zoned crystals show oligoclase rims.

ⓘ Plancheite

Formula: Cu8(Si8O22)(OH)4 · H2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Omega Mine, Monument Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA

ⓘ Planerite

Formula: Al6(PO4)2(PO3OH)2(OH)8 · 4H2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Camelback Mountain, New Cornelia Mine area, New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA

ⓘ Plattnerite

Formula: PbO2

Localities: Reported from at least 6 localities in this region.

ⓘ Plumbojarosite

Formula: Pb0.5Fe3+3(SO4)2(OH)6

Localities: Reported from at least 6 localities in this region.

ⓘ Polybasite

Formula: [Ag6Sb2S7][Ag9CuS4]

ⓘ Posnjakite

Formula: Cu4(SO4)(OH)6 · H2O

Description: Associated with gypsum and partly altered pyrite.

ⓘ 'Potash Clay'

Description: Occurs in a weathered, copper-stained quartz keratophyre.

ⓘ Powellite

Formula: Ca(MoO4)

Localities: Reported from at least 16 localities in this region.

ⓘ Prehnite

Formula: Ca2Al2Si3O10(OH)2

Description: Occurs in andesite.

ⓘ Pseudoboleite

Formula: Pb31Cu24Cl62(OH)48

ⓘ Pseudobrookite

Formula: Fe2TiO5

ⓘ Pseudomalachite

Formula: Cu5(PO4)2(OH)4

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Oxide Mine, Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Saginaw Hill (Saginaw property), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
South side of Saginaw Hill, Amole Mine group, Saginaw Hill (Saginaw property), Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
Southern Comobabi Mts - East end, Comobabi Mountains, Pima County, Arizona, USA

ⓘ 'Psilomelane'

Localities: Reported from at least 15 localities in this region.

ⓘ 'Pumpellyite Subgroup'

Formula: Ca2XAl2[Si2O6(OH)][SiO4](OH)2A

ⓘ Pyrite

Formula: FeS2

Localities: Reported from at least 243 localities in this region.

Habit: Crystals to 1 cm, bounded by pyritohedral and cubic faces.

Description: Relatively scarce in this porphyry orebody. Particularly abundant in dioritic border facies; also in Concentrator volcanics as a few fine crystal groups. Veinlets to 2 - 3 cm thick and discrete grains in silicates, quartz, and magnetite.

ⓘ Pyrite var. Copper-bearing Pyrite

Formula: (Fe,Cu)S2

Localities:

Isle Royal Mine group, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Leader Mine, Leader Hill, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Isle Royal Mine, Isle Royal Mine group, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA

ⓘ Pyrite var. Gold-bearing Pyrite

Formula: FeS2

Localities:

Emmett & Elgin Mine, Baboquivari Mining District, Baboquivari Mountains, Pima County, Arizona, USA
Gold Bullion Mine (Banes 1 & 2 claims; Banes claims; Last Chance claim group; Tellurium claim group), Weaver Canyon, Baboquivari Mining District, Baboquivari Mountains, Pima County, Arizona, USA
Jupiter Mine, Mildred Peak, Baboquivari Mining District, Baboquivari Mountains, Pima County, Arizona, USA

ⓘ Pyrolusite

Formula: Mn4+O2

Localities: Reported from at least 12 localities in this region.

ⓘ Pyromorphite

Formula: Pb5(PO4)3Cl

Localities:

Cerro Colorado Mine (Heintzelman Mine; Silver Queen Mine), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
Indiana-Arizona Mine, Indiana-Arizona Mine group (Carbonate group), Waterman Mining District, Pima County, Arizona, USA
Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Steppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Unnamed prospect, Cardigan Peak, Chico Shunie Hills, Ajo Mining District, Pima County, Arizona, USA ? (more information)

ⓘ Pyrophyllite

Formula: Al2Si4O10(OH)2

ⓘ 'Pyroxene Group'

Formula: ADSi2O6

Localities:

Mineral Hill Mines (Azurite group; Old Azurite Mine; Copper Glance Mine), Mineral Hill, Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Mission pit, Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

ⓘ Pyrrhotite

Formula: Fe1-xS

Localities: Reported from at least 13 localities in this region.

ⓘ Quartz

Formula: SiO2

Localities: Reported from at least 81 localities in this region.

ⓘ Quartz var. Agate

Localities:

Sentinel Peak area ('A' Mountain area), Tucson, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
Northern Tucson Mountains Agate deposit, Tucson Mountains, Pima County, Arizona, USA
Pantano - North of, Empire Mining District, Empire Mountains, Pima County, Arizona, USA

Colour: Blue & white

Description: Occurs in abundant geodes in basalt flows.

ⓘ Quartz var. Carnelian

ⓘ Quartz var. Chalcedony

Formula: SiO2

Localities: Reported from at least 15 localities in this region.

Colour: Emerald-green

Description: Occurs as clear, nearly transparent material of beautiful color.

ⓘ Quartz var. Fortification Agate

Formula: SiO2

Colour: Blue & white banded

ⓘ Quartz var. Milky Quartz

Formula: SiO2

Localities:

Picacho Mine (Cahuabi Mine; Cababi Mine), Sells, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Mary G Mine (Mary E Mine; Princess claim; Princess group), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
Mildren Mine (Mildren claim; Mildred Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Steppe Mine (Steppe claim; Little Mary Mine), Mildren Mine group, Ko Vaya, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA

ⓘ Quartz var. Rock Crystal

Formula: SiO2

Description: Occurs in geodes in basalt flows.

ⓘ Quartz var. Smoky Quartz

Formula: SiO2

ⓘ Ranciéite

Formula: (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O

Description: Occurs in vugs in volcanic rock with zeolites.

ⓘ Rasmussenite (TL)

Formula: Ca(C2H3O3)2 · 3H2O

Type Locality:

References:

Yang, H., Gu, X, Kampf, A. R., Lazar, W., Gibbs, R. B., and Downs, R. T.: Rasmussenite, IMA 2024-018, in: CNMNC Newsletter 80, Eur. J. Mineral., 36, https://doi.org/10.5194/ejm-36-599-2024, 2024.

ⓘ Rhodochrosite

Formula: MnCO3

ⓘ Rhodonite

Formula: CaMn3Mn[Si5O15]

Localities:

Baboquivari Mine (Black Diamond group; Red and Black Chief group), Baboquivari Mining District, Baboquivari Mountains, Pima County, Arizona, USA
Sasabe, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

Description: Minor.

ⓘ 'Riebeckite Root Name Group'

Formula: ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2

ⓘ 'Riebeckite Root Name Group var. Crocidolite'

Formula: ◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2

ⓘ Rosasite

Formula: (Cu,Zn)2(CO3)(OH)2

Localities: Reported from at least 11 localities in this region.

ⓘ Rutile

Formula: TiO2

Localities: Reported from at least 6 localities in this region.

Habit: Stumpy, euhedral, somewhat rounded prisms (primary material).

Description: Rock forming mineral; microscopic constitutent of the quartz monzonite; sagenite type formed during chloritization of biotite; primary material as stumpy crystals. It occurs as equant grains over 20 microns at roughly 0.1% in-K feldspar. It is high in Nb.

ⓘ Samarskite-(Y)

Formula: YFe3+Nb2O8

Colour: Black

Description: Occurs as shiny crystals.

ⓘ Sanidine

Formula: K(AlSi3O8)

Description: Clear, round phenocrysts in rhyolite welded tuffs.

ⓘ Sanidine var. Barium-Sanidine

Formula: K(AlSi3O8)

ⓘ Saponite

Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O

ⓘ 'Scapolite'

ⓘ Scheelite

Formula: Ca(WO4)

Localities: Reported from at least 66 localities in this region.

ⓘ Schorl

Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Localities: Reported from at least 6 localities in this region.

ⓘ Schreibersite

Formula: (Fe,Ni)3P

ⓘ Scorodite ?

Formula: Fe3+AsO4 · 2H2O

ⓘ Sepiolite

Formula: Mg4(Si6O15)(OH)2 · 6H2O

ⓘ 'Serpentine Subgroup'

Formula: D3[Si2O5](OH)4

Localities:

Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Prosperity Mine group (Helmet Peak group; Helmet Peak Mine; Prosperity claims), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Pima Mine, Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Cienega Gap area, Pima County, Arizona, USA

Description: Occurs in metamorphic rocks.

ⓘ Shattuckite

Formula: Cu5(Si2O6)2(OH)2

Localities: Reported from at least 6 localities in this region.

Description: Occurs at times included in quartz.

ⓘ Siderite

Formula: FeCO3

Localities: Reported from at least 15 localities in this region.

ⓘ 'Silica'

Localities: Reported from at least 9 localities in this region.

ⓘ Silver

Formula: Ag

Localities: Reported from at least 9 localities in this region.

ⓘ 'Smectite Group'

Formula: A0.3D2-3[T4O10]Z2 · nH2O

ⓘ Smithsonite

Formula: ZnCO3

Localities: Reported from at least 22 localities in this region.

Habit: Small rhombohedra

Colour: Pale blue

Description: Small crystals & pale blue botryoidal masses. Dry Bone ore.

ⓘ Smithsonite var. Dry Bone Ore

Formula: ZnCO3

ⓘ Spessartine

Formula: Mn2+3Al2(SiO4)3

Description: Occurs as a dense green rock.

ⓘ Sphalerite

Formula: ZnS

Localities: Reported from at least 103 localities in this region.

ⓘ Sphalerite var. Marmatite

Formula: (Zn,Fe)S

Colour: Black

Description: Masses of crystalline material in a matrix of snow-white wollastonite and marble.

ⓘ Stanevansite (TL)

Formula: Mg(C2H3O3)2 · 2H2O

Type Locality:

ⓘ Stephanite

Formula: Ag5SbS4

ⓘ 'Stetefeldtite'

Formula: Ag2Sb2(O,OH)7

ⓘ 'Stibiconite'

Formula: Sb3+Sb5+2O6(OH)

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Silver-Lead claim, Cababi Mining District (Comobabi Mining District), Comobabi Mountains, Pima County, Arizona, USA
Pinnacle Peak area, New Cornelia Mine area, New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA ? (more information)

ⓘ Stibnite

Formula: Sb2S3

Localities:

Whitcomb Mine, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Tucson Mountains, Pima County, Arizona, USA

ⓘ 'Stilbite Subgroup'

Formula: M6-7[Al8-9Si27-28O72] · nH2O

Localities:

New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Sierrita Mine, Batamote Hills, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Esperanza Mine [new] (Esperanza pit; Esperanza open pit mines; West Esperanza Mine), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

Habit: Bladed

Colour: Yellow

ⓘ Stolzite

Formula: Pb(WO4)

Localities:

Good Enough Mine group (Zappia claims; Soto and Esperanza groups), Las Guijas area, Las Guijas Mountains, Arivaca Mining District (Las Guijas Mining District), Las Guijas & San Luis Mountains, Pima County, Arizona, USA
Omega Mine, Monument Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA ? (more information)

ⓘ Stringhamite

Formula: CaCu(SiO4) · H2O

Description: Occurs with associated species in wollastonite.

ⓘ Stromeyerite

Formula: AgCuS

Localities:

ⓘ Sulphur

Formula: S8

Localities:

ⓘ Svanbergite

Formula: SrAl3(PO4)(SO4)(OH)6

Localities:

ⓘ Taenite

Formula: (Fe,Ni)

ⓘ Talc

Formula: Mg3Si4O10(OH)2

Localities:

Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Total Wreck Mine, Cienega Creek, The Narrows, Empire Mining District, Empire Mountains, Pima County, Arizona, USA
Sammy Dog Mine, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

ⓘ 'Tennantite Subgroup'

Formula: Cu6(Cu4C2+2)As4S12S

Localities: Reported from at least 6 localities in this region.

Description: Subordinate amounts in tetrahedrite nuclei of grains whose borders are composed of bornite and chalcopyrite.

ⓘ Tenorite

Formula: CuO

Localities: Reported from at least 31 localities in this region.

Description: Relatively small amounts; black crusts on chalcocite.

ⓘ 'Tetrahedrite Subgroup'

Formula: Cu6(Cu4C2+2)Sb4S12S

Localities: Reported from at least 32 localities in this region.

Description: Nuclei of composite grains whose borders are composed of bornite and chalcopyrite. Contains subordinate tennantite.

ⓘ 'Tetrahedrite Subgroup var. Mercury-bearing Tetrahedrite'

Formula: Cu6[Cu4(Zn,Fe,Hg)2]Sb4S13

Localities:

Cerro Colorado Mine (Heintzelman Mine; Silver Queen Mine), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
Mary G Mine (Mary E Mine; Princess claim; Princess group), Cerro Colorado Mining District, Cerro Colorado Mountains, Pima County, Arizona, USA
Roadside Mine (St. Francis Mine; Coyote claim), Pan Tak, Coyote Mining District, Coyote Mountains, Pima County, Arizona, USA

ⓘ 'Tetrahedrite Subgroup var. Silver-bearing Tetrahedrite'

Formula: (Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13

Localities:

Rich Hill Mine group, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Prosperity Mine group (Helmet Peak group; Helmet Peak Mine; Prosperity claims), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Olivette and Annette Mines (Olivette Mine; Olive Mine; New Olivette Mine; Corda Brothers group; Corda group), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

ⓘ Thénardite

Formula: Na2SO4

Description: Ephemeral thin, spotty crusts on andesitic volcanic rocks.

ⓘ Thomsonite-Ca

Formula: NaCa2[Al5Si5O20] · 6H2O

ⓘ Titanite

Formula: CaTi(SiO4)O

Localities: Reported from at least 8 localities in this region.

Habit: Euhedral; commonly 1 mm, & locally more than 3 mm long.

Description: Rock forming mineral. Conspicuous in euhedral crystals in the Cornelia quartz monzonite.

ⓘ Topaz

Formula: Al2(SiO4)(F,OH)2

Localities:

Ajo Mining District, Pima County, Arizona, USA
Twin Buttes Mine, Twin Buttes, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
Gibson Arroyo area, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA

Description: In New Cornelia Quartz Monzonite West of Gibson Arroyo fault.

ⓘ Torbernite

Formula: Cu(UO2)2(PO4)2 · 12H2O

Localities:

Esperanza Mine [new] (Esperanza pit; Esperanza open pit mines; West Esperanza Mine), Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA
El Tiro Mine, Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA
Linda Lee claims, Quijotoa (Covered Wells), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA
New Cornelia Mine, Ajo, Little Ajo Mountains, Ajo Mining District, Pima County, Arizona, USA
Oxide Mine, Silver Bell Mine, Mineral Mountain, Silver Bell Mining District, Silver Bell Mountains, Pima County, Arizona, USA

ⓘ 'Tourmaline'

Formula: A D3G6 (T6O18)(BO3)3X3Z

Localities: Reported from at least 6 localities in this region.

ⓘ Tremolite

Formula: ◻Ca2Mg5(Si8O22)(OH)2

Localities: Reported from at least 14 localities in this region.

Description: Occurs in contact-metamorphosed rocks.

ⓘ Tridymite

Formula: SiO2

Description: Occurs in cavities in andesite.

ⓘ Tsumebite

Formula: Pb2Cu(PO4)(SO4)(OH)

Localities:

Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Central claim, Rosemont (Rosemont Camp), Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Rosemont (Rosemont Camp), Helvetia-Rosemont Mining District, Pima County, Arizona, USA

ⓘ Turquoise

Formula: CuAl6(PO4)4(OH)8 · 4H2O

Localities: Reported from at least 10 localities in this region.

ⓘ Uraninite

Formula: UO2

Localities: Reported from at least 11 localities in this region.

ⓘ Uraninite var. Pitchblende

Formula: UO2

Localities:

Black Dike Mine (Black Dike group; Black Dike claim; Black Dike deposit; Black Dyke Mine; Big Dike; Bobson group; Big Dike Apex & Ajax), Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
Lena No. 1 - 11 claims, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA
Glen claims, Papago Mining District (Sierrita Mining District), Sierrita Mountains, Pima County, Arizona, USA

Description: Sooty variety.

ⓘ Uranophane

Formula: Ca(UO2)2(SiO3OH)2 · 5H2O

Localities:

Copper Squaw Mine (Andrade Mine; Luper Mine; Cooley Mine), Quijotoa (Covered Wells), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA
Linda Lee claims, Quijotoa (Covered Wells), Quijotoa Mining District, Quijotoa Mountains, Pima County, Arizona, USA
Sure Fire No. 1 claim (Sure Fire claim; Vanover property), Bar-LY Ranch, Redington Mining District, Pima County, Arizona, USA
Red Hils claims, Pima County, Arizona, USA
Dutchess claim, Tucson, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA

ⓘ Valleriite

Formula: (Fe2+,Cu)4(Mg,Al)3S4(OH,O)6

Localities:

Tucson area valleriite locality, Tucson area, Pima County, Arizona, USA
Pima Mine, Mission complex, San Xavier, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA

ⓘ Vanadinite

Formula: Pb5(VO4)3Cl

Localities: Reported from at least 9 localities in this region.

Description: Exceptionally beautiful specimens and as pseudomorphs after wulfenite.

ⓘ Vermiculite

Formula: Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2O

Description: Occurs in rocks metamorphosed by igneous intrusions.

ⓘ Vesuvianite

Formula: Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9

Localities: Reported from at least 8 localities in this region.

ⓘ Vesuvianite var. Beryllium-bearing Vesuvianite

Formula: (Ca,Na,◻)19(Al,Mg,Fe3+)13(◻,B,Al,Fe3+,Be)5(Si2O7)4(SiO4)10(OH,F,O)10

ⓘ 'Wad'

Localities: Reported from at least 10 localities in this region.

ⓘ Whewellite

Formula: Ca(C2O4) · H2O

ⓘ Willemite

Formula: Zn2SiO4

Localities: Reported from at least 10 localities in this region.

Habit: Small, barrel-shaped

Description: Occurs near head of the inclined surface tram.

ⓘ Witherite

Formula: BaCO3

Description: Occurs as micro-crystals.

ⓘ 'Wolframite Group'

Localities: Reported from at least 17 localities in this region.

ⓘ Wollastonite

Formula: Ca3(Si3O9)

Localities: Reported from at least 20 localities in this region.

ⓘ Wulfenite

Formula: Pb(MoO4)

Localities: Reported from at least 41 localities in this region.

ⓘ 'Zeolite Group'

ⓘ Zircon

Formula: Zr(SiO4)

Localities: Reported from at least 7 localities in this region.

Habit: Small stout prisms

Description: Primary rock forming mineral in the Cornelia quartz monzonite; quite unaffected during mineralization.

ⓘ Zoisite

Formula: (CaCa)(AlAlAl)O[Si2O7][SiO4](OH)

Localities:

Big Juanita Mine group (Brown prospect), Baboquivari Mining District, Baboquivari Mountains, Pima County, Arizona, USA
Giant Mine (Giant Tungsten prospect; Grand Mountain Mine; Grand Mountain claim; Giant Mine; Giant Nos. 3-10), Baboquivari Mining District, Baboquivari Mountains, Pima County, Arizona, USA
Sierrita Mine, Batamote Hills, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima County, Arizona, USA