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Osarizawaite Hydrous Lead Copper sulfate Silver Hill Mine Pima County Arizona 1946.jpg
Osarizawaite from Arizona
Category Sulfate minerals, alunite group
(repeating unit)
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
Color Greenish yellow
Tenacity Brittle
Mohs scale hardness 3 - 4
Specific gravity 3.89 - 4.037
Optical properties Uniaxial (+)
Refractive index nω = 1.712() nε = 1.732(2)
Birefringence δ = 0.020
Pleochroism Visible
References [1][2][3]

Osarizawaite is a greenish yellow sulfate mineral with the chemical formula: PbCuAl2(SO4)2(OH)6. It has rhombohedral crystals.[4]

It was first described in 1961 for an occurrence in the oxidized zone of the Osarizawa mine, Akita Prefecture, Honshu Island, Japan.[1]


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