Physical Properties |
|
| Chemical formula | CuFeS2 |
| Class | Sulfide |
| Crystal system | Tetragonal |
| Habit | Pseudotetrahedra Massive aggregates Prismatic |
| Color | Brass-yellow Sometimes tarnished If oxidized, may show subtle reds, greens, blues, and purples |
| Hardness | 3.5 to 4 |
| Specific gravity | 4.2 |
| Cleavage | Poor {011} |
| Fracture | Uneven |
| Luster | Metallic |
| Transparency | Opaque |
| Streak | Greenish black |
| Twinning | Polysynthetic Penetration |
| after Perkins, 356 |
Chalcopyrite in Hand Sample
Chalcopyrite
Chalcopyrite in Conococheague Formation limestone
Chalcopyrite with garnet and kyanite