General Information:
Chemical Formula:
(Cu,Fe)12Sb4S13
Composition:
(Molecular Weight = 1,643.31 gm)
Iron 10.20 % Fe
Copper 34.80 % Cu
Antimony 29.64 % Sb
Sulfur 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
More details...