Urusovite
(repeating unit)CuAlAsO5 IMA symbol Uusv[1] Strunz classification 8.BB.60 Dana classification 38.05.09.02 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/c Unit cell a = 7.314 Å, b = 10.223 Å
c = 5.576 Å; β = 99.79°; Z = 4 Identification Color Light green Cleavage Perfect Fracture Brittle Mohs scale hardness 4 Luster Vitreous (glassy) Streak White Diaphaneity Translucent Optical properties Biaxial (−) Refractive index nα = 1.672 nβ = 1.718 nγ = 1.722 Birefringence δ = 0.050 Dispersion r > v strong References [2][3]
(same H-M symbol)
c = 5.576 Å; β = 99.79°; Z = 4
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]
References
- v
- t
- e