General Information:
Chemical Formula:
Cu3As
Composition:
(Molecular Weight = 265.56 gm)
Copper 71.79 % Cu
Arsenic 28.21 % As
Empirical Formula:
Cu3As
Locality:
PORTAGE LA
Name Origin:
Named after the Chilean mineralogist, I. Domeyk (1802-1889).
Physical Properties:
Cleavage:
None
Color:
gray, yellow brown, silver white, or tin white.
Density:
7.2 - 8.1, Average = 7.65
Diaphaniety:
Opaque
Habits:
Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Reniform - "Kidney like" in shape (e.g.. hematite)., Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
3-3.5 - Calcite-Copper Penny
Luminescence:
None.
Luster:
Metallic
Streak:
black gray
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