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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Atacamite from
Hay Gill Copper Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK


Locality type:Mine
Classification
Species:Atacamite
Formula:Cu2(OH)3Cl
Comments:Bridges et al. (2011): "There are three specimens of atacamite in the NHM collections that Kingsbury claimed to have found at Hay Gill. [...] There are sound geochemical reasons for saying there is no possibility that a specimen as rich as this could have originated in the Caldbeck Fells and the same is true for the two lesser specimens. They are all virtually certainly fraudulent."
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Atacamite data
Locality Data:Click here to view Hay Gill Copper Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:1294
Long-form Identifier:1:3:1294:2
GUID (UUID V4):0
Nearest other occurrences of Atacamite
1.2km (0.7 miles) ⓘOld Potts Gill Mine, Potts Gill, Caldbeck, Allerdale, Cumbria, England, UK
1.7km (1.1 miles) ⓘRoughton Gill Mine, Roughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
1.7km (1.1 miles) ⓘRoughton Gill, Caldbeck, Allerdale, Cumbria, England, UK
42.8km (26.6 miles) ⓘCriffel granodiorite, Dalbeattie, Dumfries and Galloway, Scotland, UK
44.1km (27.4 miles) ⓘCaulkerbush, Dalbeattie, Dumfries and Galloway, Scotland, UK
44.7km (27.8 miles) ⓘMarbruie Cove, Dalbeattie, Dumfries and Galloway, Scotland, UK
45.7km (28.4 miles) ⓘNeedle's Eye Mine, Needle's Eye, Dumfries and Galloway, Scotland, UK
53.8km (33.4 miles) ⓘDalbeattie, Dumfries and Galloway, Scotland, UK
References
Kingsbury, Arthur W. G., Hartley, J. (1956) Atacamite from Cumberland and Cornwall. Mineralogical Magazine and Journal of the Mineralogical Society, 31 (235) 349-350 doi:10.1180/minmag.1956.031.235.14
Hartley, J. (1984) A list of minerals associated with the ore deposits of the Caldbeck Fells, Cumbria. Transactions of the Leeds Geological Association, 10 (3) 22-39
Cooper, M. P., Stanley, C. J. (1990) Minerals of the English Lake District - Caldbeck Fells. The Natural History Museum, London.
Bridges, T.F., Rumsey, M.S., Leppington, C.M. (2011) A report on Hay Gill Mine, Caldbeck Fells, Cumbria. Journal of the Russell Society, 14. 62-68
 
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