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Name: |
chalcocite |
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Class: |
Sulfides |
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Chemistry: |
Cu2S copper sulfide |
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Color(s): |
metallic luster, dark color usually charcoal gray or black, sometimes iridescent colors. |
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Hardness: |
2.5 - 3.0 |
SpecGrav: |
5.5 - 5.8 |
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Fracture: |
conchoidal |
Cleavage: |
indistinct |
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Crystal: |
Orthorhombic crystals rare, tabular, hexagonal and striated. |
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Envronment: |
Ore veins, hydrothermal sulfide deposits |
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Association: |
cuprite, azurite, malachite |
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Locals: |
| Montana, Arizona, USA | Peru | Mexico | Namibia | Italy | |
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Misc: |
The name comes from the Greek "chalcos", meaning "copper". Dissolves easily in nitric acid, and in a flame it decomposes giving off sulfur dioxide fumes. |
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