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


Locality type:Mine
Classification
Species:Cornubite
Formula:Cu5(AsO4)2(OH)4
Comments:Kingsbury reference. Cooper & Stanley (1990): "During the characterization of cornubite as a new species (Claringbull et al., 1959: 2) two specimens from Potts Gill were examined. They were both collected by Kingsbury and showed 'light and dark green botryoidal cornubite, with on the latter specimen a bluish skin of cornwallite'. Although visually different, the two cornubite varieties yielded identical x-ray powder photographs, the data for which was tabulated by Claringbull et al. (op. cit.)."
Habit:botryoidal
Colour:light to dark green
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Cornubite data
Locality Data:Click here to view Old Potts Gill Mine, Potts Gill, Caldbeck, Allerdale, Cumbria, England, UK
Data Identifiers
Mindat Occurrence Record ID:3969
Long-form Identifier:1:3:3969:7
GUID (UUID V4):0
Nearest other occurrences of Cornubite
44.8km (27.9 miles) ⓘCaulkerbush, Dalbeattie, Dumfries and Galloway, Scotland, UK
46.6km (28.9 miles) ⓘNeedle's Eye Mine, Needle's Eye, Dumfries and Galloway, Scotland, UK
54.6km (33.9 miles) ⓘDalbeattie, Dumfries and Galloway, Scotland, UK
References
Claringbull, G. F., Hey, M. H., Davis, R. J. (1959) Cornubite, a new mineral dimorphous with cornwallite. Mineralogical Magazine and Journal of the Mineralogical Society, 32 (244) 1-5 doi:10.1180/minmag.1959.032.244.01
Cooper, M. P., Stanley, C. J. (1990) Minerals of the English Lake District - Caldbeck Fells. The Natural History Museum, London.
Anthony, John W., Bideaux, Richard A., Bladh, Kenneth W., Nichols, Monte C. - Eds. (2016) Handbook of Mineralogy. https://www.handbookofmineralogy.org/
 
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