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
Krufter Ofen, Kruft, Pellenz, 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 Krufter Ofen, Kruft, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:85082
Long-form Identifier:1:3:85082:1
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.3km (0.8 miles) ⓘIn den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
1.6km (1.0 miles) ⓘLorenzfelsen, Nickenich, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
2.0km (1.2 miles) ⓘPumice quarries, Wingertsberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
2.8km (1.7 miles) ⓘBasalt quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.0km (1.9 miles) ⓘThelenberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.1km (1.9 miles) ⓘNickenicher Weinberg, Nickenich, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.3km (2.0 miles) ⓘNickenicher Sattel, Nickenich, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
4.2km (2.6 miles) ⓘGleeser Felder, Glees, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
4.2km (2.6 miles) ⓘVeitskopf, Wassenach, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
4.6km (2.9 miles) ⓘKorretsberg, Kruft, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
References
Sandberger, Fr., Die Mineralien des Lacher Sees, Neues Jahrb. f. Min.,140-148, 1845
 
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