Cu12Sb4S13Cubic
Tetrahedrite
Cu12Sb4S13
SulfidesChemical FormulaCu12Sb4S13
Crystal SystemCubic
Mohs Hardness3.5
Specific Gravity4.97
ColorSteel gray to iron black
LusterMetallic
StreakBlack to brown
CleavageNone
FractureUneven
Occurrence
Found in hydrothermal veins. Copper ore. Antimony often replaces arsenic.