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
Eilean Donnan Castle, Dornie, Lochalsh, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK


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:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Eilean Donnan Castle, Dornie, Lochalsh, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK
Data Identifiers
Mindat Occurrence Record ID:708294
Long-form Identifier:1:3:708294:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
0.7km (0.4 miles) ⓘDun Mor, Dornie, Lochalsh, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK
1.1km (0.7 miles) ⓘTorr a Char, Dornie, Lochalsh, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK
1.3km (0.8 miles) ⓘCarr Brae, Dornie, Lochalsh, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK
1.8km (1.1 miles) ⓘCreag Reidh Raineach, Dornie, Lochalsh, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK
3.0km (1.9 miles) ⓘSgurr Aoidhe, Loch Duich, Highland, Scotland, UK
3.5km (2.2 miles) ⓘGleann Udalain, Auchtertyre, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK
3.7km (2.3 miles) ⓘAvernish, Auchtertyre, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK
3.8km (2.4 miles) ⓘAn Leth Alt, Loch Duich, Highland, Scotland, UK
4.3km (2.7 miles) ⓘAuchtertyre, Wester Ross， Strathpeffer and Lochalsh, Highland, Scotland, UK
11.2km (7.0 miles) ⓘAllt an Fhaing, Glen Beag, Glenelg, Wester Ross, Strathpeffer and Lochalsh, Highland, Scotland, UK
References
Render, Paul (n.d.) Paul Render Collection.
 
and/or  
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