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
Firmerich, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany


07214570017369430919546.jpg
Biotite, etc.

Firmerich, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
07214570017369430919546.jpg
Biotite, etc.

Firmerich, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
07675190017271981848461.jpg
Biotite, etc.

Firmerich, Daun, 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
Associated Minerals Based on Photo Data:
Augite1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Firmerich, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:85188
Long-form Identifier:1:3:85188:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
4.1km (2.6 miles) ⓘAltburg, Schalkenmehren, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
4.7km (2.9 miles) ⓘLöhley, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
5.9km (3.7 miles) ⓘKahlenberg, Oberstadtfeld, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
5.9km (3.7 miles) ⓘNerother Kopf, Neunkirchen, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
5.9km (3.7 miles) ⓘEmmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
6.9km (4.3 miles) ⓘEselsberg, Dockweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
7.2km (4.5 miles) ⓘHangelberg quarry, Hinterweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
7.6km (4.7 miles) ⓘHummerich, Utzerath, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
8.6km (5.4 miles) ⓘRadersberg quarry, Dreis-Brück, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
8.7km (5.4 miles) ⓘDreiser Weiher, Dreis, Dreis-Brück, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
References
Hentschel, Gerhard (1983) Die Mineralien der Eifelvulkane (1st ed.). Christian Weise Verlag. 152 pp.
 
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