Urusovite

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Urusovite
General
CategoryArsenate mineral
Formula
(repeating unit)
CuAlAsO5
Strunz classification8.BB.60
Dana classification38.05.09.02
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/c
Unit cella = 7.314 Å, b = 10.223 Å
c = 5.576 Å; β = 99.79°; Z = 4
Identification
ColorLight green
CleavagePerfect
FractureBrittle
Mohs scale hardness4
LusterVitreous (Glassy)
StreakWhite
DiaphaneityTranslucent
Optical propertiesBiaxial (-)
Refractive indexnα = 1.672 nβ = 1.718 nγ = 1.722
Birefringenceδ = 0.050
Dispersionr > v strong
References[1][2]

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.[1][2] It was named after Vadim Sergeevich Urusov, crystal chemist of Moscow State University.[3] It was approved by the International Mineralogical Association in 1998.[1]

References[]


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