General Information:
Chemical Formula:Cu3AsS4
Composition:(Molecular Weight = 393.82 gm)Copper 48.41 %
CuArsenic 19.02 %
AsSulfur 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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