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
Gruvdalen Mine (Skeppsdal), Österåker, Stockholm County, Sweden


Locality type:Mine
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 Gruvdalen Mine (Skeppsdal), Österåker, Stockholm County, Sweden
Data Identifiers
Mindat Occurrence Record ID:901464
Long-form Identifier:1:3:901464:0
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.2km (2.6 miles) ⓘHärsbacka, Österåker, Stockholm County, Sweden
10.2km (6.3 miles) ⓘYtterby, Resarö, Vaxholm, Stockholm County, Sweden
44.6km (27.7 miles) ⓘAlmunge complex, Almunge, Uppsala, Uppsala County, Sweden
60.5km (37.6 miles) ⓘÄngsholmarna Norra, Haninge, Stockholm County, Sweden
60.6km (37.7 miles) ⓘNyköpingsgruvan, Utö Mines, Utö, Haninge, Stockholm County, Sweden
60.6km (37.7 miles) ⓘUtö Mines, Utö, Haninge, Stockholm County, Sweden
62.4km (38.8 miles) ⓘNothamn, Väddö, Norrtälje, Stockholm County, Sweden
63.4km (39.4 miles) ⓘNorra Fjäll (Fjällbacka pegmatite), Väddö, Norrtälje, Stockholm County, Sweden
68.4km (42.5 miles) ⓘKapelludden, Rånö, Haninge, Stockholm County, Sweden
68.5km (42.6 miles) ⓘNorrö Mica Quarry, Norrö, Haninge, Stockholm County, Sweden
References
Wik, Nils-Gunnar, Stephens, Michael B., Sundberg, Arne (2005) Malmer, industriella mineral och bergarter i Stockholms län [Ores, industrial minerals and rocks in Stockholm County]. Sveriges Geologiska Undersökning. Rapporter och Meddelanden 117 146 pp. p.69
 
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