Osarizawaite

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Osarizawaite
Osarizawaite Hydrous Lead Copper sulfate Silver Hill Mine Pima County Arizona 1946.jpg
Osarizawaite from Arizona
General
Category Sulfate minerals, alunite group
Formula PbCuAl2(SO4)2(OH)6
IMA symbol Orz [1]
Strunz classification 7.BC.10
Crystal system Trigonal
Crystal class Hexagonal scalenohedral (3m)
H-M symbol: (3 2/m)
Space group R3m
Unit cell a = 7.05, c = 17.24(1) [Å], Z = 3
Identification
ColorGreenish yellow
Tenacity Brittle
Mohs scale hardness3 - 4
Specific gravity 3.89 - 4.037
Optical propertiesUniaxial (+)
Refractive index nω = 1.712() nε = 1.732(2)
Birefringence δ = 0.020
Pleochroism Visible
References [2] [3] [4]

Osarizawaite is a greenish yellow sulfate mineral with the chemical formula: Pb Cu Al 2(S O 4)2(OH)6. It has rhombohedral crystals. [5]

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. 1 2 Mindat.org
  3. Webmineral.com
  4. "Handbook of Mineralogy" (PDF). Archived from the original (PDF) on 2016-03-03. Retrieved 2011-05-16.
  5. Fleischer, Michael & Mandarino, Joseph, "Glossary of Mineral Species", The Mineralogical Record, 1991