General Information:
Chemical Formula:Cu3As
Composition:(Molecular Weight = 265.56 gm)Copper 71.79 %
CuArsenic 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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