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
Hummerich, Utzerath, Daun, 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 Hummerich, Utzerath, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:179357
Long-form Identifier:1:3:179357:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
7.6km (4.7 miles) ⓘFirmerich, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
9.4km (5.9 miles) ⓘRadersberg quarry, Dreis-Brück, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
10.1km (6.3 miles) ⓘAltburg, Schalkenmehren, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
11.1km (6.9 miles) ⓘEselsberg, Dockweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
11.8km (7.3 miles) ⓘLöhley, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
11.9km (7.4 miles) ⓘDreiser Weiher, Dreis, Dreis-Brück, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
12.1km (7.5 miles) ⓘHangelberg quarry, Hinterweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
12.8km (8.0 miles) ⓘEmmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
12.9km (8.0 miles) ⓘDöhmberg, Oberehe-Stroheich, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
13.2km (8.2 miles) ⓘNerother Kopf, Neunkirchen, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
References
Weiß, Stefan (1990) Mineralfundstellen Atlas Deutschland West. Christian Weise Verlag, Munich, Germany. 320pp.
 
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