Physical Properties |
|
| Chemical formula | MnO2 |
| Class | Oxide |
| Crystal system | Tetragonal |
| Habit | Perfect tetragonal prisms (rare) Dendritic Fibrous Reniform Columnar Orthorhombic pseudomorphs after manganite |
| Color | Black |
| Hardness | 1 to 2 |
| Specific gravity | 4.5 to 5 |
| Cleavage | Perfect prismatic {110} (rare) |
| Fracture | Uneven |
| Luster | Metallic |
| Transparency | Opaque |
| Streak | Black |
| after Perkins, 373 |
Pyrolusite in Hand Sample
Pyrolusite
Pyrolusite
Pyrolusite dendrites