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Mineralpedia Details for Covellite

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Covellite

Covellite

Named after Niccolo Covelli who discovered the mineral at its type locality at Mt. Vesuvius in the Naples province of Campania, Italy. Covellite has thousands of localities worldwide, however rich material comes from localities in Italy, Austria, Germany, Russia, Morocco, the United States, and Argentina. It occurs typically of secondary origin in oxidized copper sulfide deposits, and can be of hydrothermal origin and is commonly found as a tarnish on other sulfides. Covellite is noted as being highly iridescent.

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

Formula
CuS 
Crystal System
Hexagonal 
Crystal Habit
Platy, Foliated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
indigo blue, light blue, dark blue, black 
Streak
black gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle 
Hardness
1.5-2 
WebMineral
View Covellite 
Mindat
View Covellite 

Covellite from Butte dist., Silver Bow Co., Montana, United States

Covellite
            from Butte dist., Silver Bow Co., Montana, United States

Covellite crystals showing excellent platy iridescent purple crystals to 1.5cm. The side view of this mineral shows the contact of the copper vein mineralization with the wall rock. Another specimen shows compact purple, platy crystals (6cm).

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Covellite from Chuquicamata mine, El Loa Prov., Antofagasta, Chile

Covellite
            from Chuquicamata mine, El Loa Prov., Antofagasta, Chile

Large purplish mass of Covellite.

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Covellite from Leonard mine, Butte dist., Silver Bow Co., Montana, United States

Covellite
            from Leonard mine, Butte dist., Silver Bow Co., Montana, United States

Superb platy crystal group of purple-blue Covellite with individual crystals to 7mm.

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Covellite from Junction shaft, Bisbee, Cochise Co., Arizona, United States

Covellite
            from Junction shaft, Bisbee, Cochise Co., Arizona, United States

Deep purple Covellite throughout matrix.

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Covellite from Summitville dist., Rio Grande Co., Colorado, United States

Covellite
            from Summitville dist., Rio Grande Co., Colorado, United States

Blue to purple thin hexagonal crystals to 3mm.

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