Stephanite
Stephanite is a silver antimony sulfosalt mineral with formula: Ag5SbS4. It is composed of 68.8% silver, and sometimes is of importance as an ore of this metal.
| Stephanite | |
|---|---|
| General | |
| Category | Sulfosalt mineral |
| Formula (repeating unit) | Ag5SbS4 |
| IMA symbol | Sph |
| Strunz classification | 2.GB.10 |
| Dana classification | 03.02.04.01 |
| Crystal system | Orthorhombic |
| Crystal class | Pyramidal (mm2) H-M symbol: (mm2) |
| Space group | Cmc21 |
| Identification | |
| Colour | Lead grey to black |
| Crystal habit | Tabular, pseudo-hexagonal crystals; massive |
| Twinning | Common on [110] repeated, forms pseudohexagonal groupings |
| Cleavage | Imperfect on {010}, poor on {021} |
| Fracture | Subconchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 2.0–2.5 |
| Lustre | Metallic |
| Streak | Iron black |
| Diaphaneity | Opaque |
| Specific gravity | 6.26 |
| Optical properties | Anisotropic in polished section |
| Pleochroism | Very weak – white to pale pink |
| References | |
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