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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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Chalcophyllite from
Wheal Gorland, St Day, Cornwall, England, UK


03373170017360511054819.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
09828740017271979332824.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
02566050017271979371719.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
07293760017271979401629.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
03373170017360511054819.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
07455810017363550182563.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
02566050017271979371719.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
07293760017271979401629.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
03373170017360511054819.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
09828740017271979332824.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
02566050017271979371719.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
07293760017271979401629.jpg
Chalcophyllite

Wheal Gorland, St Day, Cornwall, England, UK
Locality type:Mine
Classification
Species:Chalcophyllite
Formula:Cu18Al2(AsO4)4(SO4)3(OH)24 · 36H2O
Habit:Hexagonal plates
Colour:Bluish-green
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Pharmacosiderite5
Scorodite3
Plumbogummite2
Liroconite1
Copper ore1
Data
Mineral Data:Click here to view Chalcophyllite data
Locality Data:Click here to view Wheal Gorland, St Day, Cornwall, England, UK
Photo GalleryView Gallery (41 photos)
Data Identifiers
Mindat Occurrence Record ID:3485
Long-form Identifier:1:3:3485:2
GUID (UUID V4):0
Localities for Chalcophyllite in this Region
Wheal Muttrall, Wheal Gorland, St Day, Cornwall, England, UK
Nearest other occurrences of Chalcophyllite
0.2km (0.1 miles) ⓘWheal Muttrall, Wheal Gorland, St Day, Cornwall, England, UK
0.6km (0.4 miles) ⓘWheal Unity, Gwennap, Cornwall, England, UK
0.9km (0.6 miles) ⓘWheal Jewel, Gwennap, Cornwall, England, UK
1.9km (1.2 miles) ⓘCathedral Mine, Busveal, St Day, Cornwall, England, UK
2.0km (1.2 miles) ⓘTing Tang Mine, Carharrack, Cornwall, England, UK
2.2km (1.4 miles) ⓘUnited Mines (Gwennap United Mines), Clifford Amalgamated Mines, Gwennap, Cornwall, England, UK
3.2km (2.0 miles) ⓘWheal Sparnon, Redruth, Cornwall, England, UK
3.6km (2.3 miles) ⓘTresavean Mine, Lanner, Lanner, Cornwall, England, UK
4.9km (3.0 miles) ⓘSouth Wheal Basset, Carnkie, Carn Brea, Cornwall, England, UK
5.0km (3.1 miles) ⓘWheal Ellen (Old Basset Mine), Mawla Lane End, St Agnes, Cornwall, England, UK
References
Phillips, William (1823) An Elementary Introduction to Mineralogy (3rd ed.)
Hall, Townshend M. (1868) The Mineralogist's Directory: or, a guide to the Principal Mineral Localities in the United Kingdom of Great Britain and Ireland. Edward Stanford.
Miers, H. A. (1894) Spangolite. Mineralogical Magazine and Journal of the Mineralogical Society, 10 (48) 273-277 doi:10.1180/minmag.1894.010.48.02
 
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