Uraninite
| Uraninite | |
|---|---|
 | |
| General | |
| Category | Mineral |
| Chemical formula | Uranium dioxide or uranium(IV) oxide (UO2) |
| Identification | |
| Color | Black or brownish |
| Crystal habit | Massive, botryoidal, granular. Crystals uncommon. |
| Crystal system | Isometric |
| Cleavage | Indistinct |
| Fracture | Conchoidal to uneven |
| Mohs scale hardness | 5 - 6 |
| Luster | Submetallic, greasy |
| Streak | Same as colour, black or brownish |
| Specific gravity | 7.8 - 10 |
| Refractive index | Opaque |
| Pleochroism | None |
| Solubility | Soluble in sulfuric, nitric, and hydrofluoric acids. |
| Major varieties | |
| Pitchblende | Massive |
Uraninite
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