Bornite
mineral · common
Quick facts
- Formula
- Cu5FeS4
- Hardness
- 3
- Luster
- Metallic
- Colors
- Brownish bronze, iridescent tarnish
Bornite is a copper iron sulfide mineral with a metallic luster and iridescent tarnish. It's often found in hydrothermal veins and is an important copper ore.
Look for its iridescent tarnish and metallic luster, along with a gray-black streak.
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