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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Tetrahedrite Subgroup from
Nether Row Brow, Caldbeck, Allerdale, Cumbria, England, UK


Classification
Species:'Tetrahedrite Subgroup' (not an IMA approved species)
Formula:Cu6(Cu4C22+)Sb4S12S
Comments:From the dumps of the Nether Row Farm level as small masses (< 3mm) in granular quartz (M.P. Cooper Collection, det. BM(NH) & British Geological Survey (BGS): XRD, 1987). (Cooper & Stanley, 1990).
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Data
Mineral Data:Click here to view Tetrahedrite Subgroup data
Locality Data:Click here to view Nether Row Brow, Caldbeck, Allerdale, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:17909
Long-form Identifier:1:3:17909:0
GUID (UUID V4):0
Nearest other occurrences of Tetrahedrite Subgroup
1.3km (0.8 miles) ⓘOld Sandbed Mine, Caldbeck, Allerdale, Cumbria, England, UK
1.8km (1.1 miles) ⓘDriggith Mine, Caldbeck, Allerdale, Cumbria, England, UK
3.3km (2.1 miles) ⓘRoughton Gill Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
3.4km (2.1 miles) ⓘRoughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
3.9km (2.4 miles) ⓘHigher Roughton Gill (Balliway Rigg), Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
4.0km (2.5 miles) ⓘCarrock Mine, Mungrisdale, Eden, Cumbria, England, UK
16.0km (9.9 miles) ⓘEmbleton Quarry, Embleton, Allerdale, Cumbria, England, UK
20.0km (12.4 miles) ⓘGreenside Mine, Patterdale, Eden, Cumbria, England, UK
20.0km (12.4 miles) ⓘScar Crags, Coledale, Above Derwent, Allerdale, Cumbria, England, UK
20.8km (12.9 miles) ⓘGoldscope Mine, Newlands Valley, Above Derwent, Allerdale, Cumbria, England, UK
References
Cooper, M. P., Stanley, C. J. (1990) Minerals of the English Lake District - Caldbeck Fells. The Natural History Museum, London.
 
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