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
Hunnakko, Alavus, South Ostrobothnia, Finland


Locality type:Pegmatite
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 Hunnakko, Alavus, South Ostrobothnia, Finland
Data Identifiers
Mindat Occurrence Record ID:640681
Long-form Identifier:1:3:640681:3
GUID (UUID V4):0
Nearest other occurrences of Biotite
5.3km (3.3 miles) ⓘKaatiala pegmatite, Kuortane, South Ostrobothnia, Finland
12.5km (7.8 miles) ⓘTarikko, Seinäjoki, South Ostrobothnia, Finland
13.2km (8.2 miles) ⓘHaapaluoma pegmatite, Peräseinäjoki, Seinäjoki, South Ostrobothnia, Finland
25.3km (15.7 miles) ⓘP-K pegmatite, Seinäjoki, South Ostrobothnia, Finland
25.4km (15.8 miles) ⓘRoutakallio Quarry (Satamo Quarry), Seinäjoki, South Ostrobothnia, Finland
26.2km (16.3 miles) ⓘPajuluoma, Seinäjoki, South Ostrobothnia, Finland
60.9km (37.8 miles) ⓘLappajärvi meteorite crater, Lappajärvi, South Ostrobothnia, Finland
74.1km (46.0 miles) ⓘKauhajärvi, Kauhajoki, South Ostrobothnia, Finland
94.8km (58.9 miles) ⓘNiemikylä granite quarries, Kuru, Ylöjärvi, Pirkanmaa, Finland
References
Wilke, Hans-Jürgen (1976) Mineralfundstellen - Ein Führer zum Selbstsammeln Vol. 4 - Skandinavien. Christian Weise Verlag. 370 pp.
 
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