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
Haapaluoma pegmatite, Peräseinäjoki, Seinäjoki, South Ostrobothnia, Finland


Locality type:Quarry
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 Haapaluoma pegmatite, Peräseinäjoki, Seinäjoki, South Ostrobothnia, Finland
Data Identifiers
Mindat Occurrence Record ID:98778
Long-form Identifier:1:3:98778:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
13.2km (8.2 miles) ⓘHunnakko, Alavus, South Ostrobothnia, Finland
17.3km (10.8 miles) ⓘKaatiala pegmatite, Kuortane, South Ostrobothnia, Finland
18.2km (11.3 miles) ⓘTarikko, Seinäjoki, South Ostrobothnia, Finland
25.2km (15.6 miles) ⓘRoutakallio Quarry (Satamo Quarry), Seinäjoki, South Ostrobothnia, Finland
26.1km (16.2 miles) ⓘPajuluoma, Seinäjoki, South Ostrobothnia, Finland
27.0km (16.8 miles) ⓘP-K pegmatite, Seinäjoki, South Ostrobothnia, Finland
61.4km (38.1 miles) ⓘKauhajärvi, Kauhajoki, South Ostrobothnia, Finland
73.4km (45.6 miles) ⓘLappajärvi meteorite crater, Lappajärvi, South Ostrobothnia, Finland
86.4km (53.7 miles) ⓘNiemikylä granite quarries, Kuru, Ylöjärvi, Pirkanmaa, Finland
96.0km (59.6 miles) ⓘHaveri mine, Viljakkala, Ylöjärvi, Pirkanmaa, Finland
References
Haapala, Ilmari (1966) On the granitic pegmatites in the Peräseinäjoki-Alavus area, South Pohjanmaa, Finland. Bulletin de la Commission Géologique de Finlande Vol. 224. Geological Survey of Finland
 
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