Montgomeryite (original) (raw)

A valid IMA mineral species - grandfathered

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About MontgomeryiteHide

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Formula:

Ca4MgAl4(PO4)6(OH)4 · 12H2O

Colour:

Dark green to light green, colourless, red, yellow

Crystal System:

Monoclinic

Name:

After Arthur Montgomery (2 December 1909, New York City, New York, USA - 31 December 1999, Albuquerque, New Mexico, USA), American mineralogist, Professor of Geology, Lafayette College, Easton, Pennsylvania, USA, who collected the first specimens.

The Mg analogue of kingsmountite and fanfaniite.

A secondary mineral in sedimentary phosphate nodules and as a late-stage mineral in highly oxidized phosphate nodules in granitic pegmatite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2767:6

064ab492-5287-4042-befc-4b4e2ae5cdc3

IMA Classification of MontgomeryiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Classification of MontgomeryiteHide

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8.DH.25

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1

42.11.8.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O

19.8.12

19 : Phosphates
8 : Phosphates of Al and other metals

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol Source Reference
Mgm IMA–CNMNC Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MontgomeryiteHide

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Transparency:

Transparent, Translucent

Colour:

Dark green to light green, colourless, red, yellow

Comment:

Coloration may be zoned.

Cleavage:

Perfect
On {010}, perfect; on {100}, poor.

Density:

2.53 g/cm3 (Measured) 2.523 g/cm3 (Calculated)

Optical Data of MontgomeryiteHide

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RI values:

_n_α = 1.572 _n_β = 1.578 _n_γ = 1.582

2V:

Measured: 75° , Calculated: 78°

δ = 0.010

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

X = Colourless to pale green
Y = Z = Colourless

also, may exhibit:

X = Light orange-brown
Y = Pale magenta-pink
Z = Light orange-brown

Chemistry of MontgomeryiteHide

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Mindat Formula:

Ca4MgAl4(PO4)6(OH)4 · 12H2O

Crystallography of MontgomeryiteHide

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Crystal System:

Monoclinic

Class (H-M):

2 - Sphenoidal

Cell Parameters:

a = 10.02 Å, b = 24.12 Å, c = 6.24 Å
β = 91.55°

Ratio:

a:b:c = 0.415 : 1 : 0.259

Unit Cell V:

1,507.55 ų (Calculated from Unit Cell)

Morphology:

Crystals lathlike, flattened on {010} and elongated and striated along [001]; terminated by pyramids. {010} dominant, with many {hk0} vicinal prism forms. Commonly occur in subparallel growths in contact on {010}. Massive; as subparallel aggregates of coarse plates.

Crystal StructureHide

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Geological EnvironmentHide

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Geological Setting:

Granitic pegmatites

Type Occurrence of MontgomeryiteHide

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Place of Conservation of Type Material:

Harvard University, Cambridge, Massachusetts, USA: #95481.

Geological Setting of Type Material:

Phosphate nodules in sedmimentary rocks.

Associated Minerals at Type Locality:

Other Language Names for MontgomeryiteHide

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Relationship of Montgomeryite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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8.DH. Ferroberaunite Fe2+Fe3+5(PO4)4(OH)5 · 6H2O Mon. 2/m : _B_2/b
8.DH. Rowleyite [Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6 · n[H2O,Na,NH4,K,Cl] Iso.
8.DH. Ammoniotinsleyite (NH4)Al2(PO4)2(OH) · 2H2O Mon. 2/m : _P_21/m
8.DH. Thebaite-(NH4) (NH4)3Al(C2O4)(PO3OH)2(H2O) Mon. 2/m : _P_21/b
8.DH. Dendoraite-(NH4) (NH4)2NaAl(C2O4)(PO3OH)2(H2O)2 Mon. 2/m
8.DH. Whiteite-(MnMnMn) Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH. Whiteite-(CaMnFe) CaMnFe2Al2(PO4)4(OH)2 · 8H2O Mon. 2/m
8.DH. Hochleitnerite Mn2Ti3(PO4)4O2(H2O)2 · 14H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH. Regerite KFe6(PO4)4(OH)7(H2O)6 · 4H2O Mon. 2/m : _P_21/b
8.DH.05 Minyulite KAl2(PO4)2F · 4H2O Orth. m _m_2 : P b _a_2
8.DH.10 Leucophosphite KFe3+2(PO4)2(OH) · 2H2O Mon. 2/m : _P_21/b
8.DH.10 Spheniscidite (NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O Mon. 2/m
8.DH.10 Tinsleyite KAl2(PO4)2(OH) · 2H2O Mon.
8.DH.15 Jahnsite-(CaMnFe) {Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(CaMnMg) {Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(CaMnMn) {Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Keckite CaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2O Mon. 2/m : _P_2/b
8.DH.15 Rittmannite {(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Whiteite-(CaFeMg) {Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_21/b
8.DH.15 Whiteite-(CaMnMg) {Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O Mon. 2/m
8.DH.15 Whiteite-(MnFeMg) {(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_21/b
8.DH.15 Jahnsite-(MnMnMn) {Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_21/b
8.DH.15 Kaluginite (Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O Orth.
8.DH.15 Jahnsite-(CaFeFe) {Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2O Mon.
8.DH.15 Jahnsite-(NaFeMg) NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(NaMnMg) {(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(CaMgMg) {Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O
8.DH.15 Whiteite-(CaMnMn) {Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Whiteite-(MnMnMg) MnMnMg2Al2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(MnMnMg) Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(CaFeMg) CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(MnMnFe) Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Whiteite-(CaMgMg) CaMg3Al2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(MnMnZn) Mn2+Mn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(NaMnMn) NaMn2+(Mn2+Fe3+)Σ2Fe3+2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.15 Jahnsite-(CaMnZn) CaMn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2O Mon. 2/m : _P_2/b
8.DH.20 Lun'okite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH.20 Manganosegelerite (Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH.20 Overite CaMgAl(PO4)2(OH) · 4H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH.20 Segelerite Ca2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P c c a
8.DH.20 Wilhelmvierlingite CaMnFe3+(PO4)2(OH) · 2H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH.20 Juonniite CaMgSc(PO4)2(OH) · 4H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH.25 Calcioferrite Ca2Fe3+2(PO4)3(OH) · 7H2O Mon. 2/m : _B_2/b
8.DH.25 Kingsmountite Ca3MnFeAl4(PO4)6(OH)4 · 12H2O Tric. 1 : _P_1
8.DH.25 Zodacite Ca4Mn2+Fe3+4(PO4)6(OH)4 · 12H2O Mon.
8.DH.25 Fanfaniite Ca4MnAl4(PO4)6(OH)4 · 12H2O Mon. 2/m : _B_2/b
8.DH.30 Arseniosiderite Ca2Fe3+3(AsO4)3O2 · 3H2O Mon. 2/m : _B_2/b
8.DH.30 Kolfanite Ca2Fe3+3O2(AsO4)3 · 2H2O Mon.
8.DH.30 Mitridatite Ca2Fe3+3(PO4)3O2 · 3H2O Mon. 2/m : _B_2/b
8.DH.30 Pararobertsite Ca2Mn3+3(PO4)3O2 · 3H2O Mon. 2/m : _P_21/b
8.DH.30 Robertsite Ca2Mn3+3(PO4)3O2 · 3H2O Mon. m : B b
8.DH.30 Sailaufite (Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2O Mon. m : B m
8.DH.35 Mantienneite KMg2Al2Ti(PO4)4(OH)3 · 15H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH.35 Paulkerrite K(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O Mon. m
8.DH.35 Benyacarite (H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH.35 Hydroxylbenyacarite (H2O)2Mn2(Ti2Fe)(PO4)4[O(OH)](H2O)10 · 4H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a
8.DH.35 Macraeite K(H2O)Mn2(Fe2Ti)(PO4)4[O(OH)](H2O)10 · 4H2O Mon. 2/m : _P_21/b
8.DH.35 Sperlingite (H2O)K(Mn2+Fe3+)(Al2Ti)(PO4)4[O(OH)] [(H2O)9(OH)] · 4H2O Mon. 2/m : _P_21/b
8.DH.40 Xanthoxenite Ca4Fe3+2(PO4)4(OH)2 · 3H2O Tric. 1 : _P_1
8.DH.45 Mahnertite NaCu3(AsO4)2Cl · 5H2O Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_4/m m m
8.DH.50 Andyrobertsite KCdCu5(AsO4)4(H2AsO4) · 2H2O Mon. 2/m : _P_21/m
8.DH.50 Calcioandyrobertsite KCaCu5(AsO4)4(H2AsO4) · 2H2O Mon. 2/m : _P_21/m
8.DH.55 Englishite K3Na2Ca10Al15(PO4)21(OH)7 · 26H2O Mon. 2/m
8.DH.60 Bouazzerite Bi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2O Mon. 2/m
8.DH.65 Galliskiite Ca4Al2(PO4)2F8 · 5H2O Tric. 1 : _P_1
8.DH.70 Joteite Ca2CuAl(AsO4)[AsO3(OH)]2(OH)2 · 5H2O Tric. 1 : _P_1
8.DH.75 Kampelite Ba6Mg3Sc8(PO4)12(OH)6 · 7H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a
8.DH.80 Kapundaite NaCaFe4(PO4)4(OH)3 · 5H2O Tric. 1 : _P_1
8.DH.85 Vaniniite Ca2Mn2+3Mn3+2O2(AsO4)4 · 2H2O Mon. 2/m : _P_21/b

Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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References for MontgomeryiteHide

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Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.978-979

Localities for MontgomeryiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Australia
ⓘ Christmas Island Trueman (1965)
New South Wales Westmoreland County ⓘ Jenolan Caves Podgson RE +1 other reference
South Australia Pastoral Unincorporated Area Boolcoomatta Reserve (Boolcoomata Station) ⓘ Wiperaminga Hill West Quarry (Wipperaminga Hill) ?
Iron Knob ⓘ Iron Monarch Main Pit Pilkington et al. (1979)
Victoria Moorabool Shire Parwan ⓘ Parwan lava caves Birch et al. (1993)
Western Australia Meekatharra Shire Milgun Station ⓘ Milgun Variscite Mine Mineralogical Magazine 39 (1974) +1 other reference
Woodlands Station ⓘ Woodlands variscite gold occurrence (Low Hill; Waldburg variscite deposit) ? Nickel (2008)
Austria
Styria Leoben District Sankt Peter-Freienstein ⓘ Brandberg Mitteilungen der Abteilung für Mineralogie am Landesmuseum Joanneum (1998)
Brazil
Minas Gerais Itinga Taquaral ⓘ Ilha claim Cassedanne et al. (1973)
Cape Verde
Barlavento Islands ⓘ Sal Island Figueiredo +3 other references
France
Nouvelle-Aquitaine Dordogne Sarlat-la-Canéda Cénac-et-Saint-Julien ⓘ Grotto XVI Karkanas et al. (2002)
Occitanie Pyrénées-Orientales Perpignan ⓘ Tautavel Lacroix (1910)
ⓘ Caune de l'Arago Quattropani et al. (1999) +1 other reference
Germany
Bavaria Lower Bavaria Regen District Zwiesel Rabenstein ⓘ Hühnerkobel Mine (Hennenkobel Mine) Weiß (1990)
Hesse Darmstadt Bergstraße Heppenheim Kirschhausen ⓘ Görzklinge Wittern (2001)
Darmstadt-Dieburg Messel ⓘ Messel Mine Liesegang et al. (2022)
Giessen Region Lahn-Dill-Kreis Lahnau Waldgirmes ⓘ Rotläufchen Mine SEM-EDS and Raman Spectroscopy by Joy ...
Israel
Haifa District Hof HaCarmel ⓘ et-Tabun Cave Goldberg et al. (1975)
ⓘ Kebara Cave Weiner et al. (1993)
Italy
Sardinia South Sardinia Province ⓘ Villaputzu Orlandi (2011)
Sicily Trapani Province Castellammare del Golfo ⓘ Abisso dei Cocci Vattano M. et al. (2013) +1 other reference
Kazakhstan
Turkistan Region ⓘ Taldyk Bernard et al. (2004)
Mexico
Coahuila Cuatro Ciénegas Municipality Cuatro Ciénegas (Cuatrociénegas de Carranza; Venustiano Carranza) Limestone caves ⓘ Rosillo cave Forti (2006)
Morocco
Drâa-Tafilalet Region Ouarzazate Province Amerzgane Cercle Ouisselsate Caïdat ⓘ Angarf-South pegmatite FRANSOLET (1987)
Marrakesh-Safi Region Rehamna Province Sidi Bou Othmane Cercle Jebilet Mtn (Djebilet Mtn) Sidi Bou Othmane ⓘ Mrirat pegmatite Favreau (2012)
Namibia
Erongo Region Dâures Constituency ⓘ Sandamap North Farm 115 von Bezing (2007)
ⓘ Sandamap pegmatite Der Aufschluss 36:117-119
Portugal
Guarda Sabugal Bendada ⓘ Bendada Mines Schnorrer-Köhler (1991)
Viseu Sátão Ferreira de Aves Aldeia Nova ⓘ Assunção Mine
South Africa
Gauteng West Rand District Municipality Far West Rand Western Sector Carletonville ⓘ West Driefontein cave Martini (1978)
North West Dr Kenneth Kaunda District Municipality JB Marks Local Municipality Ventersdorp ⓘ Boons Cave Martini (1978)
Western Cape West Coast District Municipality Cederberg Local Municipality ⓘ Diepkloof Rock Shelter Miller et al. (2013)
Spain
Castile and Leon Salamanca Garcirrey ⓘ Julita quarry (Cañada pegmatite) Christian Rewitzer collection
Catalonia Barcelona Baix Llobregat ⓘ Gavà Camprubí et al. (4)
ⓘ Bruguers Melgarejo et al. (1988)
ⓘ Cal Gairal street outcrops Joan Rosell. RosellMinerals
ⓘ Elvira Mine Bareche (2005)
Gavà Mines (Can Tintorer Mines) ⓘ Les Ferreres Range area Díaz-Acha et al. (2022)
Vallès Occidental Montcada i Reixac ⓘ Montcada Hill Quarry Mineralogistes de Catalunya (1997)
Navarre Esteríbar Eugui ⓘ Azcárate Quarry (Azkarate Quarry) Calvo Rebollar (2015)
Sweden
Norrbotten County Kiruna Svappavaara ⓘ Leveäniemi Mine
Thailand
Chiang Mai Province ⓘ Cave of the Monk Lenoble et al. (2006, September)
USA
Nevada Elko County ⓘ Wendover Mining District Castor et al. (2004)
Esmeralda County Candelaria Mining District (Columbus Mining District) ⓘ Candelaria-Sigmund group Collected by Dick Thomssen.
Humboldt County Iron Point Mining District Valmy ⓘ Silver Coin Mine Silver Coin Mine. Compact Disc. Paul ...
Osgood Mountains Potosi Mining District ⓘ Redhouse Barite Mine Rocks & Minerals. Nov. 1999. +2 other references
ⓘ Twin Creeks Mine Castor et al. (2004)
ⓘ Vista Pit Min News (1999)
Mineral County Candelaria Mining District ⓘ Argentum Mining Co. Mine (Northern Belle Mine; Holmes Mine) Kampf et al. (2016)
Candelaria Silver Mine ⓘ Northern Belle pit Collected by Paul Adams. EDS and XRD ...
Nye County Toquima Range Northumberland Mining District ⓘ Northumberland Mine Castor et al. (2004)
Pershing County Willard Mining District ⓘ Willard Mine Castor et al. (2004)
South Dakota Custer County Custer Mining District Fourmile ⓘ Tip Top Mine Rocks & Minerals: 60: 117. +1 other reference
Pringle Cicero Peak ⓘ White Elephant Mine Smith et al. (2000)
Lawrence County Bald Mountain Mining District (Portland Mining District) ⓘ Wharf Mine Loomis (2011)
Pennington County Keystone Mining District Keystone ⓘ Etta Mine Rocks & Minerals: 57: 160 &/or 60: 110 ...
Utah Box Elder County Utahlite Hill ⓘ Utahlite claim Don Howard (1999)
Utah County Sunshine Mining District Fairfield ⓘ Clay Canyon (TL) Palache et al. (1951) +1 other reference
ⓘ Little Green Monster Variscite Mine Wilson (2010)