Cattierite
ID: 31
Cattierite
Chemical Formula
CoS₂
Hardness (Mohs)
5.5 - 6
Crystal System
Isometric
Streak
Grayish black
Luster
Metallic
Diaphaneity
Opaque
Color
Grayish black to iron black
Crystal Habit / Mode of Occurrence
Isometric - Diploidal; typically cubic, pyritohedral, or octahedral crystals; also massive.
Fun Facts
Cattierite is the cobalt analogue of pyrite, meaning it has the same crystal structure as pyrite but with cobalt substituting for iron. Common Uses: Minor ore of cobalt, primarily of scientific and collector interest.