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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