Hydronium Jarosite
| Formula | (H3O)Fe3+ 3 (SO4)2(OH)6 |
| Origin | Lavrion (Greece) |
| Description | golden yellow massive piece of many small hydronium jarosite crystals |
| Classification (Lapis) | Sulfates |
| Crystal System | hexagonal |
| Hardness | 4,0 – 4,5 |
| Colour | bright yellow to pale yellow |
| Streak | white |
| Luminescence | none observed |
| Luster | dull |
| Transparency (Opacity) | translucent |
| Cleavage | perfect |
| Fracture | uneven to conchoidal |
| Magnetism | negative |
| Geological Setting | the oxidized zone of rapidly weathering sulfide-bearing rocks |
| Specific Gravity | 3,01 g/cm3 |
