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
Grassgarth Height, Haverthwaite, South Lakeland, Cumbria, England, 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:Believed Valid
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Grassgarth Height, Haverthwaite, South Lakeland, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:14986
Long-form Identifier:1:3:14986:8
GUID (UUID V4):0
Nearest other occurrences of Biotite
30.9km (19.2 miles) ⓘMecklin Wood, Wasdale, Copeland, Cumbria, England, UK
32.3km (20.1 miles) ⓘWad Mine, Seathwaite, Borrowdale, Allerdale, Cumbria, England, UK
32.9km (20.4 miles) ⓘShap Pink Quarry, Shap Rural, Eden, Cumbria, England, UK
46.9km (29.1 miles) ⓘBannerdale Graphite Mine, Bannerdale, Mungrisdale, Eden, Cumbria, England, UK
49.7km (30.9 miles) ⓘSale Fell Minette, Wythop, Allerdale, Cumbria, England, UK
50.6km (31.4 miles) ⓘCarrock Mine, Mungrisdale, Eden, Cumbria, England, UK
51.4km (31.9 miles) ⓘBrandy Gill Mine, Mungrisdale, Eden, Cumbria, England, UK
References
Day, Harry (1999) BMS Database, British Micromount Society.
 
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