| Urusovite | |
| Category: | Arsenate mineral |
| Formula: | CuAlAsO5 |
| Imasymbol: | Uusv[1] |
| Strunz: | 8.BB.60 |
| Dana: | 38.05.09.02 |
| System: | Monoclinic |
| Class: | Prismatic (2/m) (same H-M symbol) |
| Symmetry: | P21/c |
| Unit Cell: | a = 7.314 Å, b = 10.223 Å c = 5.576 Å; β = 99.79°; Z = 4 |
| Color: | Light green |
| Cleavage: | Perfect |
| Fracture: | Brittle |
| Mohs: | 4 |
| Luster: | Vitreous (glassy) |
| Streak: | White |
| Diaphaneity: | Translucent |
| Opticalprop: | Biaxial (−) |
| Refractive: | nα = 1.672 nβ = 1.718 nγ = 1.722 |
| Birefringence: | δ = 0.050 |
| Dispersion: | r > v strong |
| References: | [2] [3] |
Urusovite is a rare copper aluminium arsenate mineral with formula: CuAlAsO5. It is a monoclinic-prismatic light green mineral.
Its type locality and only reported occurrence is in the Novaya fumarole, Second scoria cone, North Breach, Great Fissure eruption, Tolbachik volcano, Kamchatka Oblast', Far-Eastern Region, Russia.[2] [3] It was named after Vadim Sergeevich Urusov, crystal chemist of Moscow State University.[4] It was approved by the International Mineralogical Association in 1998.[2]