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Mineral Properties and Uses

What is Chalcocite?

Chalcocite is an iron sulfide mineral and an important ore of copper. It is most commonly found as a supergene mineral in the enriched zones of sulfide deposits. It is also occurs in hydrothermal veins.

Physical Properties of Chalcocite

Chemical Classification sulfide
Color black, blackish lead gray
Streak grayish black
Luster metallic
Diaphaneity opaque
Cleavage poor
Mohs Hardness 2.5 to 3
Specific Gravity 5.5 to 5.8
Diagnostic Properties color, soft, sooty appearance
Chemical Composition copper sulfide, Cu2S
Crystal System monoclinic
Uses Used as an ore of copper

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Chalcocite from Butte, Montana. This specimen is approximately 3 inches (7.6 centimeters) across.

Chalcocite from Musina, South Africa. Specimen is approximately 1 inch (2.5 centimeters) across.

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