Osarizawaite
Osarizawaite is a greenish yellow sulfate mineral with the chemical formula: PbCuAl2(SO4)2(OH)6. It has rhombohedral crystals.[4]
| 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] |
It was first described in 1961 for an occurrence in the oxidized zone of the Osarizawa mine, Akita Prefecture, Honshu Island, Japan.[1]
References
- Mindat.org
- Webmineral.com
- Handbook of Mineralogy
- Fleischer, Michael & Mandarino, Joseph, "Glossary of Mineral Species", The Mineralogical Record, 1991
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