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
Sioulot stream alluvial deposits, Olby, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France


Locality type:Alluvials
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 Sioulot stream alluvial deposits, Olby, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
Data Identifiers
Mindat Occurrence Record ID:608279
Long-form Identifier:1:3:608279:6
GUID (UUID V4):0
Nearest other occurrences of Biotite
8.0km (5.0 miles) ⓘGigeole stream alluvial deposits, Nébouzat, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
9.1km (5.6 miles) ⓘRioupéroux stream alluvial deposits, Jollère, Perpezat, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
9.3km (5.8 miles) ⓘBuges stream alluvial deposits, Perpezat, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
10.4km (6.4 miles) ⓘChevalard stream alluvial deposits, Aurières, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
12.0km (7.4 miles) ⓘPuy de Lemptégy, Saint-Ours-les-Roches, Riom, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
14.1km (8.7 miles) ⓘRicolas stream alluvial deposits, Laqueuille, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
15.7km (9.8 miles) ⓘPuy de Ténuzet quarry, Saint-Ours-les-Roches, Riom, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
17.8km (11.1 miles) ⓘVal Blanc stream alluvial deposits, Mont-Dore, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
22.4km (13.9 miles) ⓘCouze de Chaudefour stream alluvial deposits, Voissière, Chambon-sur-Lac, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes, France
24.8km (15.4 miles) ⓘMont-Dore Volcanic Field (Mont-Dore volcanic province), Puy-de-Dôme, Auvergne-Rhône-Alpes, France
References
Périnet, François (n.d.) Personal communication.
 
and/or  
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