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
Leusdon Common, Widecombe-in-the-Moor, Teignbridge, Devon, England, UK


Locality type:Exposure
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 Leusdon Common, Widecombe-in-the-Moor, Teignbridge, Devon, England, UK
Data Identifiers
Mindat Occurrence Record ID:1410182
Long-form Identifier:1:3:1410182:9
GUID (UUID V4):0
Nearest other occurrences of Biotite
19.3km (12.0 miles) ⓘNorth Mine (East Wheal Friendship), Devon United Mines, Peter Tavy, West Devon, Devon, England, UK
23.8km (14.8 miles) ⓘMeldon Quarry, Okehampton Hamlets, West Devon, Devon, England, UK
43.5km (27.0 miles) ⓘSouth Caradon Mine, Caradon Hill, St Cleer, Cornwall, England, UK
44.5km (27.6 miles) ⓘCraddock Moor Mine, Craddock Moor, St Cleer, Cornwall, England, UK
44.5km (27.7 miles) ⓘCheesewring Quarry, Minions, Linkinhorne, Cornwall, England, UK
67.9km (42.2 miles) ⓘBodelva Pit (Carvear China Clay Works), Bodelva, St Blaise, Cornwall, England, UK
71.6km (44.5 miles) ⓘGunheath China Clay Pit, Stenalees, Treverbyn, Cornwall, England, UK
75.8km (47.1 miles) ⓘTrelavour Downs, St Dennis, Cornwall, England, UK
80.4km (50.0 miles) ⓘDyer's Quarry, Chytane, St Enoder, Cornwall, England, UK
96.8km (60.2 miles) ⓘPendennis Head, Falmouth, Cornwall, England, UK
References
Reid, Clement, Barrow, G., Sherlock, R. L., MacAlister, D. A., Dewey, H., Bromehead, C. N. (1912) The Geology of Dartmoor - Memoirs of the Geological Survey. The Geological Survey.
 
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