General Information:
Chemical Formula:
Cu9S5
Composition:
(Molecular Weight = 732.24 gm)
Copper 78.10 % Cu
Sulfur 21.90 % S
Empirical Formula:
Cu9S5
IMA Status:
Approved IMA 1960
Physical Properties:
Cleavage:
[???] Indistinct
Color:
blue, dark blue, or black.
Density:
5.6
Diaphaniety:
Opaque
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Sub Metallic
Streak:
grayish black
More details...