| Mineral | Goethite |
|---|---|
| Formula | α-Fe3+O(OH) |
| Crystal Form | Orthorhombic/Dipyramidal [2/m 2/m 2/m] |
| Cleavage | [010] Perfect, [100] Distinct |
| Color | Brown, Reddish brown, Yellowish brown, Brownish yellow, Ocher yellow |
| Density | 3.3 – 4.3 g/cm3 |
| Diaphaneity | Subtranslucent to Opaque |
| Fracture | Hackly |
| Hardness | 5.0 - 5.5 |
| Lustre | Adamantine - Silky |
| Streak | Yellowish brown |
| Dana 8 Class | 6.1.1.2 |
| Strunz Class | IV/F.06-30 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 142 |