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


00446880017272306331236.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
07988700017271927627359.jpg
Wood Copper, etc.

Wheal Unity, Gwennap, Cornwall, England, UK
04530190017271997322372.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
04073300017271997339284.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
01618720017363136574979.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
08231600017363136571570.jpg
Wood Copper, etc.

Wheal Unity, Gwennap, Cornwall, England, UK
04530190017271997322372.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
04672270017363136581398.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
00446880017272306331236.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
07988700017271927627359.jpg
Wood Copper, etc.

Wheal Unity, Gwennap, Cornwall, England, UK
04530190017271997322372.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
04073300017271997339284.jpg
Olivenite

Wheal Unity, Gwennap, Cornwall, England, UK
Locality type:Mine
Classification
Species:Olivenite
Formula:Cu2(AsO4)(OH)
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Quartz15
Cornwallite7
Chrysocolla4
Clinoclase3
Pharmacosiderite2
Chlorite Group2
Cornubite2
Ceruleite1
Parnauite1
Azurite1
Olivenite1
- var Wood Copper1
Data
Mineral Data:Click here to view Olivenite data
Locality Data:Click here to view Wheal Unity, Gwennap, Cornwall, England, UK
Photo GalleryView Gallery (29 photos)
Data Identifiers
Mindat Occurrence Record ID:8211
Long-form Identifier:1:3:8211:2
GUID (UUID V4):0
Nearest other occurrences of Olivenite
0.6km (0.4 miles) ⓘWheal Gorland, St Day, Cornwall, England, UK
0.7km (0.5 miles) ⓘWheal Muttrall, Wheal Gorland, St Day, Cornwall, England, UK
0.9km (0.6 miles) ⓘWheal Jewel, Gwennap, Cornwall, England, UK
0.9km (0.6 miles) ⓘCarharrack Mine, Gwennap, Cornwall, England, UK
0.9km (0.6 miles) ⓘWheal Maid Decline, Gwennap, Cornwall, England, UK
1.0km (0.6 miles) ⓘWest Wheal Virgin, Great Consolidated Mines, Clifford Amalgamated Mines, Gwennap, Cornwall, England, UK
1.8km (1.1 miles) ⓘUnited Mines (Gwennap United Mines), Clifford Amalgamated Mines, Gwennap, Cornwall, England, UK
2.2km (1.4 miles) ⓘTing Tang Mine, Carharrack, Cornwall, England, UK
2.4km (1.5 miles) ⓘCathedral Mine, Busveal, St Day, Cornwall, England, UK
3.5km (2.2 miles) ⓘPednandrea Mine (Pedn-an-Drea Mine), Redruth, 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.
Royal Cornwall Polytechnic Society (1870): 38. Annual Report, pp. 30-31
 
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