ID: 86
Chemical Formula
Cu₅FeS₄
Hardness (Mohs)
3
Crystal System
Orthorhombic
Streak
black
Luster
Metallic
Diaphaneity
Opaque
Color
brown
Bornite's vibrant, rainbow-like tarnish makes it look like a piece of art straight from nature! It's often called 'peacock ore'.