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
Thelenberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, 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 Thelenberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:41620
Long-form Identifier:1:3:41620:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.7km (0.4 miles) ⓘBasalt quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
1.1km (0.7 miles) ⓘPumice quarries, Wingertsberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
1.7km (1.0 miles) ⓘIn den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.0km (1.9 miles) ⓘKrufter Ofen, Kruft, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.2km (2.0 miles) ⓘMichels Quarry, Hochstein, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.4km (2.1 miles) ⓘRothenberg Quarry, Bell, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.5km (2.2 miles) ⓘLorenzfelsen, Nickenich, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
4.0km (2.5 miles) ⓘTuff outcrops, Hochstein, Ettringen, Mayen-Koblenz, Rhineland-Palatinate, Germany
4.1km (2.6 miles) ⓘCaspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
4.4km (2.7 miles) ⓘRodder Höfe, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
References
Sandberger, Fr., Die Mineralien des Lacher Sees, Neues Jahrb. f. Min., 1845, 140-148, 1845] [Minealien Welt 1/93:14]
 
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