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Name: |
enargite |
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Class: |
Sulfides |
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Chemistry: |
Cu3AsS4 Copper Arsenic Sulfide |
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Color(s): |
steel gray, dark green, to iron black, metallic |
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Hardness: |
3 - 3.5 |
SpecGrav: |
4.4 - 4.5 |
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Fracture: |
uneven |
Cleavage: |
complete |
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Crystal: |
Orthorhombic (often prismatic, usually vertically striped) sometimes tabular and often twinned |
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Envronment: |
forms in hydrothermal replacement deposits |
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Association: |
pyrite, chalcopyrite, galena, bornite, chalcosite, |
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Locals: |
Montana, Utah, USA | Chile | Philippines | Germany | Hungary | Peru | Namibia | |
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Misc: |
The name comes from the Greek "enargos", meaning "distinct" from its nearly perfect prismatic cleavage. Soluble in nitric acid and aqua regia. |
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Photos |
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