| Mineral | Franckeite |
|---|---|
| Formula | Fe2+(Pb,Sn2+)6Sn4+2Sb2S14 |
| Crystal Form | Triclinic/Pinacoidal [1] |
| Cleavage | [001] Perfect |
| Color | Grayish black, Blackish gray |
| Density | 5.5 – 5.9 g/cm3 |
| Diaphaneity | Opaque |
| Fracture | Flexible |
| Hardness | 2.5 |
| Lustre | Metallic |
| Streak | Grayish black |
| Dana 8 Class | 3.1.4.2 |
| Strunz Class | II/C.17-70 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 177 |