If it’s blocky, silvery, and heavy, it’s galena.
Physical Properties |
|
| Chemical Formula | PbS |
| Class | Sulfide |
| Crystal system | Cubic |
| Habit | Cubic Cubes modified by octahedra |
| Color | Lead gray Silvery |
| Hardness | 2.5 |
| Specific gravity | 7.6 |
| Cleavage/fracture | Perfect {100} “Cubic” “Blocky” |
| Fracture | Subconchoidal |
| Luster | Metallic |
| Transparency | Opaque |
| Streak | Lead gray |
| Twinning | Penetration Contact |
| after Perkins, 357 |