Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Biotite from
Urucum claim, Barra do Cuieté, Conselheiro Pena, Minas Gerais, Brazil


Locality type:Claim
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Urucum claim, Barra do Cuieté, Conselheiro Pena, Minas Gerais, Brazil
Data Identifiers
Mindat Occurrence Record ID:22184
Long-form Identifier:1:3:22184:3
GUID (UUID V4):0
Nearest other occurrences of Biotite
13.8km (8.6 miles) ⓘSapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
23.7km (14.7 miles) ⓘItatiaia mine, Conselheiro Pena, Minas Gerais, Brazil
35.7km (22.2 miles) ⓘSebastião Cristino claim, Linópolis, Divino das Laranjeiras, Minas Gerais, Brazil
40.9km (25.4 miles) ⓘZé Pinto claim, Aldeia, Cuparaque, Minas Gerais, Brazil
References
Atencio, Daniel, Carvalho, Flávio M.S., Matioli, Paulo A. (2004) Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galiléia, Minas Gerais, Brazil. American Mineralogist, 89 (5) 721-724 doi:10.2138/am-2004-5-606
 
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