General Information:
Chemical Formula:(Cu,Fe)12Sb4S13
Composition:(Molecular Weight = 1,643.31 gm)Iron 10.20 %
FeCopper 34.80 %
CuAntimony 29.64 %
SbSulfur 25.37 %
S Empirical Formula: Cu9Fe2+3Sb4S13
Name Origin:Name is derived from its crystal form.
Physical Properties: Cleavage:None
Color:iron gray, black, or steel gray.
Density:4.6 - 5.2, Average = 4.9
Diaphaniety:Opaque
Habits:Massive - Granular - Common texture observed in granite and other igneous rock., Massive - Uniformly indistinguishable crystals forming large masses.,
Hardness:3.5-4 - Copper Penny-Flourite
Luminescence:None.
Luster:Metallic
Streak:black
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