A lead sulphide (PbS) mineral, with very dense, dark-grey crystals. It is an important source of lead.
| Galena | |
|---|---|
| Galena (Lead sulfide) from Galena, Kansas, USA | |
| General | |
| Category | Mineral |
| Chemical formula | lead sulfide (PbS) |
| Identification | |
| Colour | Lead gray, silvery |
| Crystal habit | Cubes, tabular and sometimes skeletal crystals |
| Crystal system | Isometric hexoctahedral |
| Cleavage | Cubic |
| Fracture | Flat (when cubic) to even |
| Mohs Scale hardness | 2.5 - 2.75 |
| Luster | Metallic |
| Refractive index | Opaque |
| Pleochroism | None |
| Streak | Lead gray |
| Specific gravity | 7.4 - 7.6 |
| Fusibility | 2 |
Galena is the natural mineral form of lead sulfide.
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