Cornwallite
A variety of Minerals
What is Cornwallite?
Cornwallite is an uncommon copper arsenate mineral with formula Cu5(AsO4)2(OH)4. It forms a series with the phosphate pseudomalachite and is a dimorph of the triclinic cornubite. It is a green monoclinic mineral which forms as radial to fibrous encrustations.
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Key Characteristics
Formation of Cornwallite
It was first described in 1846, for an occurrence in Wheal Gorland, St Day United Mines of the St Day District, Cornwall, England. It occurs as secondary mineral in the oxidized zone of copper sulfide deposits. Associated minerals include olivenite, cornubite, arthurite, clinoclase, chalcophyllite, strashimirite, lavendulan, tyrolite, spangolite, austinite, conichalcite, brochantite, azurite and malachite.
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Quick Facts
Physical Properties
- Color
- Verdigis green, blackish-green, emerald-green; emerald-green in transmitted light.
- Hardness (Mohs)
- 4.5
- Density
- 4.64 g/cm³
- Streak
- Apple green
Chemical Properties
- Chemical Formula
- Cu5(AsO4)2(OH)4
- Elements
- As, Cu, H, O
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