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Mineralpedia Details for Cornetite

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Cornetite

Cornetite

Belgian geologist Jules Cornet is the namesake of the mineral Cornetite. It is a rare mineral that forms in some oxidized copper deposits in localities in the Democratic Republic of the Congo, Zambia, Zimbabwe, the United States, Chile, Mexico, and Australia among a few others. Mineral associated with Cornetite include copper, brochantite, pseudomalachite, libethenite, malachite, atacamite, chysocolla, and heterogenite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/cornetite.pdf

Formula
Cu3PO4(OH)3 
Crystal System
Orthorhombic 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
greenish blue, dark blue 
Streak
blue 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
4.5 
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Cornetite from Star of the Congo mine, Lubumbashi, Shaba, Congo

Cornetite
            from Star of the Congo mine, Lubumbashi, Shaba, Congo

Dark blue, lustrous, flat radial aggregates to 4mm.

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Cornetite from Yerington, Lyon Co., Nevada

Cornetite
            from Yerington, Lyon Co., Nevada

Deep blue, lustrous very microcrystalline Cornetite. Crystals are less than 0.5mm.

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Cornetite from Katanga Cu Crescent, Katanga, Democratic Republic of Congo

Cornetite
            from Katanga Cu Crescent, Katanga, Democratic Republic of Congo

Deep blue compact crystals of Cornetite with dark green Malachite.

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