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


07981490017366358098851.jpg
Chalcanthite

Wheal Unity, Gwennap, Cornwall, England, UK
07981490017366358098851.jpg
Chalcanthite

Wheal Unity, Gwennap, Cornwall, England, UK
09944680017271999318513.jpg
Chalcanthite

Wheal Unity, Gwennap, Cornwall, England, UK
Locality type:Mine
Classification
Species:Chalcanthite
Formula:CuSO4 · 5H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcanthite data
Locality Data:Click here to view Wheal Unity, Gwennap, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:722575
Long-form Identifier:1:3:722575:8
GUID (UUID V4):0
Nearest other occurrences of Chalcanthite
1.1km (0.7 miles) ⓘGreat Consolidated Mines, Clifford Amalgamated Mines, Gwennap, Cornwall, England, UK
2.2km (1.4 miles) ⓘTing Tang Mine, Carharrack, Cornwall, England, UK
3.5km (2.2 miles) ⓘWheal Jane, Kea, Cornwall, England, UK
6.2km (3.9 miles) ⓘCarn Brea Mine, Pool, Carn Brea, Cornwall, England, UK
10.2km (6.3 miles) ⓘHanover Cove (Vugga Hayle), St Agnes, Cornwall, England, UK
10.9km (6.7 miles) ⓘPerran St George Mine (Perran Great St George Mine; Great St George Mine; Perran St George United Mine), Perran St George and Droskyn Mines, Perranporth, Perranzabuloe, Cornwall, England, UK
14.0km (8.7 miles) ⓘDuchy Peru Mine, Perran Iron Lode (Great Perran Iron Lode), Perranzabuloe, Cornwall, England, UK
20.9km (13.0 miles) ⓘPenberthy Croft Mine, St Hilary, Cornwall, England, UK
21.8km (13.6 miles) ⓘTrevarthian Downs Mine (Trevarthen Mine), St Hilary, Cornwall, England, UK
21.8km (13.6 miles) ⓘSouth Terras Mine (Resugga & Tolgarrick Mine; Union Mine; Uranium Mine), St Stephen-in-Brannel, Cornwall, England, UK
References
Phillips, William (1823) An Elementary Introduction to Mineralogy (3rd ed.)
 
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