Bornite (Peacock ore)Cu5FeS4|
Density: 5.0 - 5.1
Streak: Grayish black
Habit: Massive fine-grained aggregate.
Colours: Iridescent purple, blue and black
| ||Crystal System: Orthorhombic|
Cleavage: Very poor
Reaction with HCl: Very weak
Identification in hand sample:
Green-blue-purple iridescence is indicative, as is a brownish-bronze colour on fresh surfaces.
Very common in copper-bearing hydrothermal sulfide deposits. Associated with chalcopyrite, chalcocite, covellite, pyrrhotite and pyrite.
Industrial / ecomonic uses:
Mined as an ore of copper, but not as important as chalcopyrite.