Taquaral, Itinga, Minas Gerais, Brazil (original) (raw)

Description: see: http://www.mindat.org/forum.php?read,6,206759,206786 Note that most such specimens from this locality turn out to be eosphorite on analysis, although Fe-dominant samples are known, so analysis is required for accurate attribution. Analyst Joan Viñals comments on a disputed Fe-rich analysis as follows: "The samples in question were clearly members of the childrenite-eosphorite series (see XRD), but with predominance of “childrenite” because, semiquantitatively, it was clear that Fe>Mn. If you see the EDS spectra, you can recognize the X-ray peaks in order of increasing energy (or atomic number) from left to right. The first peak was Al (Kα plus a small Kβ completely overlapped). Then P (Kα plus a small Kβ partially overlapped). Then Ca Kα and a small Ca Kβ well resolved. Then Mn Kα . Then Fe Kα plus a small Mn Kβ overlapped and finally Fe Kβ. According this and comparing the Fe Kα and Mn Kα peaks it can semiquantitatively conclude that Fe>Mn. Probably, the confusion was in the labels of the peaks in the printed spectrum. It appears Mn as an apparent label of the Fe Kα. However, note that the true peak label is always some at the left of the peaks."

ⓘ 'Childrenite-Eosphorite Series'

Localities:

Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Poço d'Antas claim, Piauí Valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Collinsite

Formula: Ca2Mg(PO4)2 · 2H2O

ⓘ Columbite-(Mn)

Formula: Mn2+Nb2O6

ⓘ 'Columbite-Tantalite'

Localities:

Maxixe claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Cachoeira mine, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Elbaite

Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)

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

ⓘ Eosphorite

Formula: Mn2+Al(PO4)(OH)2 · H2O

Localities:

Ilha claim, Taquaral, Itinga, Minas Gerais, Brazil
Poço d'Antas claim, Piauí Valley, Taquaral, Itinga, Minas Gerais, Brazil
Guimarãesite occurrence, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Taquaral Seco mine, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Epidote

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

ⓘ Ernstite ?

Formula: (Mn2+,Fe3+)Al(PO4)(OH,O)2 · H2O

ⓘ Fairfieldite

Formula: Ca2Mn2+(PO4)2 · 2H2O

ⓘ 'Feldspar Group'

ⓘ Ferro-katophorite ?

Formula: {Na}{CaNa}{Fe2+4Al}[(AlSi7)O22](OH)2

Description: Some of the material marketed as rare amphibole species from Taquaral is actually black kyanite from https://www.mindat.org/loc-157757.html

ⓘ Fluorapatite

Formula: Ca5(PO4)3F

ⓘ Fluor-elbaite

Formula: Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F

Localities:

Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Arqueana claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Fluorite

Formula: CaF2

ⓘ Footemineite

Formula: Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O

ⓘ Frondelite

Formula: Mn2+Fe3+4(PO4)3(OH)5

ⓘ Greifensteinite

Formula: Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O

References:

Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M. L., ... & Menezes Filho, L. A. (2017). Wilancookite,(Ba, K, Na) 8 (Ba, Li,□) 6Be24P24O96· 32H2O, a new beryllophosphate with a zeolite framework. European Journal of Mineralogy, 29(5), 923-930.

ⓘ Guimarãesite (TL)

Formula: Ca2Be4Zn5(PO4)6(OH)4 · 6H2O

Localities:

Guimarãesite occurrence, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Hureaulite

Formula: Mn2+5(PO3OH)2(PO4)2 · 4H2O

ⓘ Hydroxylherderite

Formula: CaBe(PO4)(OH)

ⓘ 'Indicolite'

Formula: A(D3)G6(T6O18)(BO3)3X3Z

Description: Small acicular inclusions

ⓘ 'Ixiolite-(Mn2+)-Ixiolite-(Fe2+) Series'

ⓘ 'K Feldspar'

Localities:

Xuxa claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Cachoeira mine, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Kosnarite

Formula: KZr2(PO4)3

ⓘ Laueite

Formula: Mn2+Fe3+2(PO4)2(OH)2 · 8H2O

ⓘ Lithiophosphate

Formula: Li3PO4

ⓘ Microcline

Formula: K(AlSi3O8)

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

ⓘ Milarite

Formula: K(◻H2O)Ca2(Be2Al)[Si12O30]

ⓘ Montebrasite

Formula: LiAl(PO4)(OH)

Localities:

Ilha claim, Taquaral, Itinga, Minas Gerais, Brazil
Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Cachoeira mine, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Montgomeryite

Formula: Ca4MgAl4(PO4)6(OH)4 · 12H2O

ⓘ Moraesite

Formula: Be2(PO4)(OH) · 4H2O

Localities:

Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Guimarãesite occurrence, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Muscovite

Formula: KAl2(AlSi3O10)(OH)2

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

ⓘ Opal

Formula: SiO2 · nH2O

ⓘ Opal var. Opal-AN

Formula: SiO2 · nH2O

ⓘ Petalite

Formula: LiAl(Si4O10)

Localities:

Maxixe claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Xuxa claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Cachoeira mine, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ 'Polylithionite-Trilithionite Series'

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

ⓘ Prehnite ?

Formula: Ca2Al2Si3O10(OH)2

ⓘ Pyrite

Formula: FeS2

ⓘ Quartz

Formula: SiO2

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

ⓘ Quartz var. Citrine

Formula: SiO2

ⓘ Quartz var. Rose Quartz

Formula: SiO2

Localities:

Ilha claim, Taquaral, Itinga, Minas Gerais, Brazil
Ademar pegmatite, Laranjeira, Taquaral, Itinga, Minas Gerais, Brazil
Taquaral, Itinga, Minas Gerais, Brazil
Mario Pinto mine, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Rockbridgeite

Formula: Fe2+Fe3+4(PO4)3(OH)5

ⓘ ~~Roscherite~~

Formula: Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O

Description: When you actually read this reference, you see that roscherite was definitely NOT reported.

ⓘ 'Roscherite Group'

Localities:

Poço d'Antas claim, Piauí Valley, Taquaral, Itinga, Minas Gerais, Brazil
Guimarãesite occurrence, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Taquaral Seco mine, Taquaral, Itinga, Minas Gerais, Brazil

Description: The only verified member of the roscherite group at this locality is ruifrancoite, although other members of the group may be present.

ⓘ Ruifrancoite

Formula: Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O

ⓘ Saléeite

Formula: Mg(UO2)2(PO4)2 · 10H2O

Localities:

Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Guimarãesite occurrence, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Schorl

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

Localities:

Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil
Guimarãesite occurrence, Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil

ⓘ Sphalerite

Formula: ZnS