Cu5FeS4Cubic
Bornite
Cu5FeS4
SulfidesChemical FormulaCu5FeS4
Crystal SystemCubic
Mohs Hardness3
Specific Gravity5.07
ColorBrownish bronze, tarnishes to blue/purple
LusterMetallic
StreakGrayish black
CleavagePoor
FractureUneven
Occurrence
Called peacock ore due to tarnish. Found in hydrothermal deposits. Copper ore.