Cu12As4S13Cubic
Tennantite
Cu12As4S13
SulfidesChemical FormulaCu12As4S13
Crystal SystemCubic
Mohs Hardness3.5
Specific Gravity4.67
ColorSteel gray to iron black
LusterMetallic
StreakBlack
CleavageNone
FractureUneven
Occurrence
Found in hydrothermal veins. Copper ore. Arsenic analog of tetrahedrite.