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
Herchenberg quarry, Burgbrohl, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany


03204040017552890377568.jpg
Biotite, etc.

Herchenberg quarry, Burgbrohl, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
03204040017552890377568.jpg
Biotite, etc.

Herchenberg quarry, Burgbrohl, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
05655830017552890387706.jpg
Biotite, etc.

Herchenberg quarry, Burgbrohl, Brohltal, Ahrweiler, 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:
Aragonite1
Hornblende Root Name Group1
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Herchenberg quarry, Burgbrohl, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:178292
Long-form Identifier:1:3:178292:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
2.9km (1.8 miles) ⓘKunkskopf quarry, Wassenach, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
3.4km (2.1 miles) ⓘLeilenkopf, Brohl-Lützing, Bad Breisig, Ahrweiler, Rhineland-Palatinate, Germany
4.3km (2.7 miles) ⓘVeitskopf, Wassenach, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
5.0km (3.1 miles) ⓘHüttenberg sand pit, Glees, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
5.2km (3.3 miles) ⓘGleeser Felder, Glees, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
6.6km (4.1 miles) ⓘLorenzfelsen, Nickenich, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
7.0km (4.4 miles) ⓘNickenicher Sattel, Nickenich, Pellenz, Mayen-Koblenz, Rhineland-Palatinate, Germany
7.4km (4.6 miles) ⓘRothenberg Quarry, Bell, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany
8.0km (4.9 miles) ⓘSchellkopf, Brenk, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
8.1km (5.0 miles) ⓘKappiger Ley (Kappiger Lay), Wehr, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany
References
Hentschel, G. (1975) Die Mineralien der basaltischen Gesteine im Laacher Vulkangebiet. Der Aufschluss, 26 (2) 65-87
 
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