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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
Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany


08541970017271985379305.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
05661580017271985421840.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
02317940017271985402276.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
02576090017272042143858.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
08541970017271985379305.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
05661580017271985421840.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
02317940017271985402276.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
06598830017272000025123.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
08541970017271985379305.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
05661580017271985421840.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
04307850017271985468259.jpg
Phlogopite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
01830860017366995753651.jpg
Phlogopite

Emmelberg, Üdersdorf, 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:
Titanite3
Amphibole Supergroup1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
Photo GalleryView Gallery (5 photos)
Data Identifiers
Mindat Occurrence Record ID:76511
Long-form Identifier:1:3:76511:6
GUID (UUID V4):0
Nearest other occurrences of Biotite
1.2km (0.7 miles) ⓘLöhley, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
2.9km (1.8 miles) ⓘAltburg, Schalkenmehren, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
4.8km (3.0 miles) ⓘKahlenberg, Oberstadtfeld, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
5.8km (3.6 miles) ⓘNerother Kopf, Neunkirchen, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
5.9km (3.7 miles) ⓘFirmerich, Daun, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
7.7km (4.8 miles) ⓘMosenberg, Bettenfeld, Wittlich-Land, Bernkastel-Wittlich, Rhineland-Palatinate, Germany
10.2km (6.3 miles) ⓘWartgesberg, Strohn, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
10.6km (6.6 miles) ⓘHangelberg quarry, Hinterweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
10.9km (6.8 miles) ⓘEselsberg, Dockweiler, Daun, Vulkaneifel, Rhineland-Palatinate, Germany
11.8km (7.4 miles) ⓘFeuerberg, Hohenfels-Essingen, Gerolstein, Vulkaneifel, Rhineland-Palatinate, Germany
References
Hentschel, Gerhard (1983) Die Mineralien der Eifelvulkane (1st ed.). Christian Weise Verlag. 152 pp.
 
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