Enargite

Enargite is a copper arsenic sulfosalt mineral with formula: Cu3AsS4. It takes its name from the Greek word enarge, "distinct." Enargite is a steel gray, blackish gray, to violet black mineral with metallic luster. It forms slender orthorhombic prisms as well as massive aggregates. It has a hardness of 3 and a specific gravity of 4.45. It is a medium to low temperature hydrothermal mineral occurring with quartz, pyrite, as well as other copper sulfides. It occurs in the mineral deposits at Butte, Montana, San Juan Mountains, Colorado and at both Bingham Canyon and Tintic, Utah. It is also found in the copper mines of Mexico, Argentina, Chile, Peru, and the Philippines.
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(n.)
An iron-black mineral of metallic luster, occurring in small orthorhombic crystals, also massive. It contains sulphur, arsenic, copper, and often silver.
  

General Information:
 Chemical Formula:
Cu3AsS4
 Composition:
(Molecular Weight = 393.82 gm)
Copper 48.41 % Cu
Arsenic 19.02 % As
Sulfur 32.57 % S 
 Empirical Formula:
Cu3AsS4
 Locality:
Butte, Montana, USA.
 Name Origin:
From the Greek enarges - "obvious."
Physical Properties:
 Cleavage:
[110] Perfect, [100] Distinct, [010] Distinct
 Color:
steel gray, blackish gray, or violet black.
 Density:
4.4 - 4.5, Average = 4.45
 Diaphaniety:
Opaque
 Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., Massive - Granular - Common texture observed in granite and other igneous rock., Prismatic - Crystals S haped like Slender Prisms (e.g. tourmali
 Hardness:
3 - Calcite
 Luminescence:
None.
 Luster:
Metallic
 Streak:
black
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enargite
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ENARGITE