Osarizawaite

Osarizawaite

Osarizawaite from Arizona
General
Category Sulfate minerals, alunite group
Formula
(repeating unit)
PbCuAl2(SO4)2(OH)6
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
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]

References

  1. 1 2 Mindat.org
  2. Webmineral.com
  3. Handbook of Mineralogy
  4. Fleischer, Michael & Mandarino, Joseph, "Glossary of Mineral Species", The Mineralogical Record, 1991
Wikimedia Commons has media related to Osarizawaite.
This article is issued from Wikipedia - version of the 10/18/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.