An antimony sulphide (Sb2S3) mineral found in low-temperature hydrothermal veins, lead-grey in colour, often occurring as long prismatic crystals. It is the chief ore of antimony.
| Stibnite | |
|---|---|
| General | |
| Category | Mineral |
| Chemical formula | antimony sulfide (Sb2S3) |
| Identification | |
| Colour | Steel gray to dull gray. |
| Crystal system | Orthorhombic |
| Cleavage | Perfect |
| Fracture | Small-scale subconchoidal |
| Mohs Scale hardness | 2 |
| Luster | Splendent on fresh crystals surfaces, otherwise metallic |
| Refractive index | Opaque |
| Pleochroism | N/A |
| Streak | Similar to colour |
| Specific gravity | 4.56 - 4.62 |
| Fusibility | ? |
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