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
Döhmberg, Oberehe-Stroheich, Gerolstein, Vulkaneifel, 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 Döhmberg, Oberehe-Stroheich, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:358667
Long-form Identifier:1:3:358667:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.9km (0.6 miles) ⓘKahlenberg, Oberehe-Stroheich, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
1.1km (0.7 miles) ⓘDreiser Weiher, Dreis, Dreis-Brück, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
2.3km (1.4 miles) ⓘMühlenberg (Krümmel), Hohenfels-Essingen, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
2.4km (1.5 miles) ⓘEselsberg, Dockweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
2.6km (1.6 miles) ⓘHangelberg quarry, Hinterweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
2.6km (1.6 miles) ⓘFeuerberg, Hohenfels-Essingen, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
4.4km (2.8 miles) ⓘRadersberg quarry, Dreis-Brück, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
5.3km (3.3 miles) ⓘAuf Dickel (incl. Nonnental), Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
5.8km (3.6 miles) ⓘRockeskyller Kopf summit, Rockeskyll volcanic complex, Rockeskyll, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
5.8km (3.6 miles) ⓘKyller Höhe, Hillesheim, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
References
Hentschel, Gerhard (1987) Die Mineralien der Eifelvulkane (2nd ed.). Christian Weise Verlag. 177 pp.
 
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