| Mineral | Polybasite |
|---|---|
| Formula | [Ag6Sb2S7][Ag9CuS4] |
| Crystal Form | Monoclinic/Prismatic [2/m] |
| Cleavage | Imperfect on {001} |
| Color | Black with dark ruby red internal reflections |
| Density | 6.1 – 6.4 g/cm3 |
| Diaphaneity | Opaque |
| Fracture | Conchoidal |
| Hardness | 2.5 - 3.0 |
| Lustre | Metallic |
| Streak | Black |
| Type Loc. | Freiberg Mining District, Mittelsachsen, Saxony, Germany |
| Dana 8 Class | 3.1.7.2 |
| Strunz Class | 2.GB.15 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 520 |