| Mineral | Chalcocite |
|---|---|
| Formula | Cu2S |
| Crystal Form | Monoclinic/Prismatic [2/m] |
| Cleavage | Indistinct on (110) |
| Color | Blue black, Gray, Black, Black gray, Steel Gray |
| Density | 5.5 – 5.8 g/cm3 |
| Diaphaneity | Opaque |
| Fracture | Conchoidal |
| Hardness | 2.5 - 3.0 |
| Lustre | Metallic |
| Streak | Blackish Gray |
| Dana 8 Class | 2.4.7.1 |
| Strunz Class | 2/B.01-10 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 339 |