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
Schlegeis tunnel, Finkenberg, Schwaz District, Tyrol, Austria


Locality type:Tunnel
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
Associated Minerals Based on Photo Data:
Calcite1
Dolomite1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Schlegeis tunnel, Finkenberg, Schwaz District, Tyrol, Austria
Data Identifiers
Mindat Occurrence Record ID:678224
Long-form Identifier:1:3:678224:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.7km (2.9 miles) ⓘAlpeiner Scharte deposit, Innervals, Vals, Innsbruck-Land District, Tyrol, Austria
5.2km (3.3 miles) ⓘHaupentalscharte (Forcella Lavizza; Haupenscharte), Oberbergtal, Sankt Jakob (San Giacomo), Pfitsch (Val di Vizze), Wipptal (Alta Vall'Isarco), South Tyrol, Trentino-Alto Adige/Südtirol, Italy
5.4km (3.4 miles) ⓘCroda Rossa southwest slope (Rotbachl peak southwest slope), Vizze Pass (Pfitsch Pass; Pfitscher Joch), Sankt Jakob (San Giacomo), Pfitsch (Val di Vizze), Wipptal (Alta Vall'Isarco), South Tyrol, Trentino-Alto Adige/Südtirol, Italy
8.6km (5.4 miles) ⓘRoßrugg ridge, Finkenberg, Schwaz District, Tyrol, Austria
9.7km (6.0 miles) ⓘUltramylonite occurrence, Finkenberg, Schwaz District, Tyrol, Austria
10.2km (6.3 miles) ⓘSaurüssel, Mayrhofen, Schwaz District, Tyrol, Austria
13.0km (8.1 miles) ⓘSchwarzenstein (Schwarzenstein glacier), Mayrhofen, Schwaz District, Tyrol, Austria
24.8km (15.4 miles) ⓘHainzenberg gold mine, Hainzenberg, Schwaz District, Tyrol, Austria
27.7km (17.2 miles) ⓘLe Cave (Grasstein), Franzensfeste (Fortezza), Wipptal (Alta Vall'Isarco), South Tyrol, Trentino-Alto Adige/Südtirol, Italy
30.1km (18.7 miles) ⓘRio dei Ronchi (Runggenbach; Telfer Weißen), South Tyrol, Trentino-Alto Adige/Südtirol, Italy
References
Gerd Stefanik
 
and/or  
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