| Mineral | Johannite |
|---|---|
| Formula | Cu(UO2)2(SO4)2(OH)2 · 8H2O |
| Crystal Form | Triclinic/Pinacoidal [1] |
| Cleavage | Distinct on {100} |
| Color | Apple green, Emerald green |
| Density | 3.3 – 3.3 g/cm3 |
| Diaphaneity | Transparent, Translucent |
| Fracture | Irregular |
| Hardness | 2.0 - 2.5 |
| Lustre | Vitreous |
| Streak | Pale green |
| Type Loc. | Elias Mine, Jáchymov, Jáchymov Dist., Krušné Hory Mtns., Karlovy Vary Rgn., Bohemia, Czech Republic |
| Dana 8 Class | 31.8.2.1 |
| Strunz Class | 6/D.21-10 |
| Mindat | mindat.org |
| WebMineral | WebMineral |
| ID | 405 |