Osarizawaite

Osarizawaite is a greenish yellow sulfate mineral with the chemical formula: PbCuAl2(SO4)2(OH)6. It has rhombohedral crystals.[5]

Osarizawaite
Osarizawaite from Arizona
General
CategorySulfate minerals, alunite group
Formula
(repeating unit)
PbCuAl2(SO4)2(OH)6
IMA symbolOrz[1]
Strunz classification7.BC.10
Crystal systemTrigonal
Crystal classHexagonal scalenohedral (3m)
H-M symbol: (3 2/m)
Space groupR3m
Unit cella = 7.05, c = 17.24(1) [Å], Z = 3
Identification
ColorGreenish yellow
TenacityBrittle
Mohs scale hardness3 - 4
Specific gravity3.89 - 4.037
Optical propertiesUniaxial (+)
Refractive indexnω = 1.712() nε = 1.732(2)
Birefringenceδ = 0.020
PleochroismVisible
References[2][3][4]

It was first described in 1961 for an occurrence in the oxidized zone of the Osarizawa mine, Akita Prefecture, Honshu Island, Japan.[2]

References

  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. Mindat.org
  3. Webmineral.com
  4. Handbook of Mineralogy
  5. Fleischer, Michael & Mandarino, Joseph, "Glossary of Mineral Species", The Mineralogical Record, 1991


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