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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Tourmaline from
Overend Quarry, Whitehaven, Copeland, Cumbria, England, UK


Locality type:Quarry
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Overend Quarry, Whitehaven, Copeland, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:17979
Long-form Identifier:1:3:17979:9
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
3.8km (2.4 miles) ⓘLanghorn Quarry, Bigrigg, Egremont, Copeland, Cumbria, England, UK
14.2km (8.8 miles) ⓘHen Comb, Loweswater Fell, Loweswater, Allerdale, Cumbria, England, UK
21.5km (13.3 miles) ⓘForce Crag Mine, Coledale, Above Derwent, Allerdale, Cumbria, England, UK
21.9km (13.6 miles) ⓘScar Crags, Coledale, Above Derwent, Allerdale, Cumbria, England, UK
21.9km (13.6 miles) ⓘCobalt Mine, Scar Crag, Causey Pike, Above Derwent, Allerdale, Cumbria, England, UK
23.6km (14.7 miles) ⓘBeckfoot Quarry, Eskdale, Copeland, Cumbria, England, UK
25.2km (15.6 miles) ⓘWaberthwaite Quarry, Waberthwaite, Copeland, Cumbria, England, UK
34.4km (21.4 miles) ⓘThrelkeld Quarry, St. John's Castlerigg and Wythburn, Allerdale, Cumbria, England, UK
35.3km (22.0 miles) ⓘBurdell Gill, Coombe Height, Caldbeck, Allerdale, Cumbria, England, UK
36.1km (22.4 miles) ⓘSaddleback Old Mine, Mungrisdale, Eden, Cumbria, England, UK
References
Day, Harry (1999) BMS Database, British Micromount Society.
 
and/or  
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