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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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Pseudomalachite from
Wheal Unity, Gwennap, Cornwall, England, UK


08957620017272306343970.jpg
Pseudomalachite

Wheal Unity, Gwennap, Cornwall, England, UK
08957620017272306343970.jpg
Pseudomalachite

Wheal Unity, Gwennap, Cornwall, England, UK
08957620017272306343970.jpg
Pseudomalachite

Wheal Unity, Gwennap, Cornwall, England, UK
Locality type:Mine
Classification
Species:Pseudomalachite
Formula:Cu5(PO4)2(OH)4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Pseudomalachite data
Locality Data:Click here to view Wheal Unity, Gwennap, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:19096
Long-form Identifier:1:3:19096:9
GUID (UUID V4):0
Nearest other occurrences of Pseudomalachite
0.6km (0.3 miles) ⓘSt Day United Mines (Poldice Mines), Gwennap, Cornwall, England, UK
0.6km (0.4 miles) ⓘWheal Gorland, St Day, Cornwall, England, UK
1.0km (0.6 miles) ⓘWest Wheal Virgin, Great Consolidated Mines, Clifford Amalgamated Mines, Gwennap, Cornwall, England, UK
1.3km (0.8 miles) ⓘWest Wheal Jewel (Tolcarne Mine; North Wheal Damsel), St Day, Cornwall, England, UK
1.8km (1.1 miles) ⓘUnited Mines (Gwennap United Mines), Clifford Amalgamated Mines, Gwennap, Cornwall, England, UK
5.4km (3.4 miles) ⓘWheal Basset, Basset Mines, Carnkie, Carn Brea, Cornwall, England, UK
9.2km (5.7 miles) ⓘSouth Tolcarne Mine, Beacon, Camborne, Cornwall, England, UK
9.2km (5.7 miles) ⓘTolcarne Mine, Beacon, Camborne, Cornwall, England, UK
16.8km (10.4 miles) ⓘWheal Providence, Wheal Tremayne, Fraddam, Gwinear-Gwithian, Cornwall, England, UK
16.8km (10.4 miles) ⓘWheal Carpenter, Fraddam, Gwinear-Gwithian, Cornwall, England, UK
References
Braithwaite, R. S. W., Ryback, G. (1994) Reichenbachite from Cornwall and Portugal. Mineralogical Magazine, 58 (392) 449-454 doi:10.1180/minmag.1994.058.392.09
 
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