Vandenbrandeite
| Vandenbrandeite | |
|---|---|
| General | |
| Category | Minerals |
| Formula | Cu(UO2)(OH)4 |
| IMA symbol | Vbd |
| Strunz classification | 04.GB.45 |
| Dana classification | 05.03.02.01 |
| Crystal system | Triclinic |
| Crystal class | Triclinic-Pinacoidal |
| Space group | P1 |
| Unit cell | 254.99 ų |
| Identification | |
| Color | Blackish green to dark green with bluish green tint |
| Cleavage | Perfect on {001}, {110} Distinct and also indisctinct in the [001] zone |
| Fracture | None |
| Tenacity | Brittle |
| Mohs scale hardness | 4 |
| Luster | Vitreous, sub-vitreous, greasy |
| Streak | Green |
| Diaphaneity | Transparent, translucent |
| Specific gravity | 5.03 |
| Density | 5.03 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 1.765 - 1.770 nβ = 1.780 - 1.792 nγ = 1.800 |
| Birefringence | 0.035 |
| Pleochroism | Visible |
| 2V angle | Measured 90° Calculated 60°- 88° |
| Dispersion | Visible to strong |
| Ultraviolet fluorescence | None |
| Other characteristics | Radioactive |
Vandenbrandeite is a mineral named after a belgian geologist, Pierre Van den Brande, who discovered an ore deposit. It was named in 1932, and has been a valid mineral ever since then.