Urusovite is a rare copper aluminium arsenate mineral with formula: CuAlAsO5. It is a monoclinic-prismatic light green mineral.

Urusovite
General
CategoryArsenate mineral
Formula
(repeating unit)
CuAlAsO5
IMA symbolUusv[1]
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[2][3]

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

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  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b c Urusovite Data on Webmineral
  3. ^ a b Urusovite on Mindat
  4. ^ Mineralogicalassociation - Urusovite Data