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
Rodder Höfe, 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 Rodder Höfe, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:357494
Long-form Identifier:1:3:357494:2
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.2km (0.7 miles) ⓘMichels Quarry, Hochstein, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
1.5km (0.9 miles) ⓘTuff outcrops, Hochstein, Ettringen, Mayen-Koblenz, Rhineland-Palatinate, Germany
1.8km (1.1 miles) ⓘHochsimmer quarries, Hochsimmer volcano, Sankt Johann, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.3km (2.1 miles) ⓘKappiger Ley (Kappiger Lay), Wehr, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
3.4km (2.1 miles) ⓘRothenberg Quarry, Bell, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.6km (2.2 miles) ⓘCaspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.9km (2.4 miles) ⓘIn der Ahl Quarry, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany
3.9km (2.4 miles) ⓘEttringer Feld, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany
4.1km (2.6 miles) ⓘHöhe 512.7, Riedener Berg, Weibern, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
4.4km (2.7 miles) ⓘThelenberg, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
References
Brauns, Reinhard (1922) Die Mineralien der Niederrheinischen Vulkangebiete - Mit besonderer Berücksichtigung ihrer Bildung und Umbildung. E. Schweizerbart'sche Verlagsbuchhandlung.
 
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