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
Drexler Mine (Draxler Mine; Drachselsried Mine), Arnbruck, Regen District, Lower Bavaria, Bavaria, Germany


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 Drexler Mine (Draxler Mine; Drachselsried Mine), Arnbruck, Regen District, Lower Bavaria, Bavaria, Germany
Data Identifiers
Mindat Occurrence Record ID:92253
Long-form Identifier:1:3:92253:5
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.4km (0.2 miles) ⓘSturmgruben, Arnbruck, Regen District, Lower Bavaria, Bavaria, Germany
1.8km (1.1 miles) ⓘPoschingerhütte Quarry (Rauchloch), Arnbruck, Regen District, Lower Bavaria, Bavaria, Germany
3.2km (2.0 miles) ⓘHirschengrube, Schwarzeck, Lohberg, Cham District, Upper Palatinate, Bavaria, Germany
3.4km (2.1 miles) ⓘStanzen Quarry, Eck, Arrach, Cham District, Upper Palatinate, Bavaria, Germany
5.8km (3.6 miles) ⓘHörndl Quarry (Hörlberg Quarry), Lohberghütte, Lohberg, Cham District, Upper Palatinate, Bavaria, Germany
5.9km (3.7 miles) ⓘFrath Mine, Frath, Drachselsried, Regen District, Lower Bavaria, Bavaria, Germany
8.3km (5.2 miles) ⓘJohanniszeche, Schmelz, Lam, Cham District, Upper Palatinate, Bavaria, Germany
8.7km (5.4 miles) ⓘHubertus pegmatite, Böbrach, Regen District, Lower Bavaria, Bavaria, Germany
9.7km (6.0 miles) ⓘMaisried pegmatite, Böbrach, Regen District, Lower Bavaria, Bavaria, Germany
11.3km (7.0 miles) ⓘBlötz Mine (Plötz Mine), Bodenmais, Regen District, Lower Bavaria, Bavaria, Germany
References
Weiß, Stefan (1990) Mineralfundstellen Atlas Deutschland West. Christian Weise Verlag, Munich, Germany. 320pp.
 
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