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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Arsenopyrite from
Old Potts Gill Mine, Potts Gill, Caldbeck, Allerdale, Cumbria, England, UK


Locality type:Mine
Classification
Species:Arsenopyrite
Formula:FeAsS
Comments:As 'fan-shaped aggregates of bladelike crystals' with chrysocolla, malachite, brochantite, and tenorite from 'a small copper vein above the present workings' (Davidson & Thomson, 1951: 140).
Found in small amounts on the dump from the old No. 1 level (Kingsbury & Hartley, 1960).
Shaw (1970: 67) records 'a small "lead" vein in the Endeavour level containing arsenopyrite, 'marmatite', and 'a very little galena'.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Arsenopyrite data
Locality Data:Click here to view Old Potts Gill Mine, Potts Gill, Caldbeck, Allerdale, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:1043
Long-form Identifier:1:3:1043:6
GUID (UUID V4):0
Nearest other occurrences of Arsenopyrite
0.2km (0.1 miles) ⓘEast Potts Gill Mine, Potts Gill, Caldbeck, Allerdale, Cumbria, England, UK
0.6km (0.4 miles) ⓘDeer Hills, Caldbeck, Allerdale, Cumbria, England, UK
0.6km (0.4 miles) ⓘDeer Hills Baryte Mine, Deer Hills, Caldbeck, Allerdale, Cumbria, England, UK
0.6km (0.4 miles) ⓘPotts Gill Copper Mine, Potts Gill, Caldbeck, Allerdale, Cumbria, England, UK
0.7km (0.4 miles) ⓘNether Row Brow, Caldbeck, Allerdale, Cumbria, England, UK
0.7km (0.4 miles) ⓘDumpy Stone Level, Caldbeck, Allerdale, Cumbria, England, UK
0.9km (0.6 miles) ⓘShort Grain, Deer Hills, Caldbeck, Allerdale, Cumbria, England, UK
1.1km (0.7 miles) ⓘOld Sandbed Mine, Caldbeck, Allerdale, Cumbria, England, UK
1.2km (0.8 miles) ⓘIngray Gill, Caldbeck, Allerdale, Cumbria, England, UK
1.5km (0.9 miles) ⓘDriggith Mine, Caldbeck, Allerdale, Cumbria, England, UK
References
 
and/or  
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