General Information:
Chemical Formula:
Cu5As2
Composition:
(Molecular Weight = 467.57 gm)
Copper 67.95 % Cu
Arsenic 32.05 % As
Empirical Formula:
Cu5As2
Environment:
Arsenical copper deposits.
Locality:
Cerny Dul, Czech Republic.
Name Origin:
Named for Jaromir Koutek (1902-1983), Czech mineralogist.
Physical Properties:
Color:
gray blue.
Density:
8.48
Diaphaniety:
Opaque
Habits:
Microscopic Crystals - Crystals visible only with microscopes., ,
Hardness:
3.5 - Copper Penny
Luster:
Metallic
Streak:
black
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