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Osarizawaite
A greenish-yellow lead-copper-aluminium sulfate from the oxidized zone of Japan's Osarizawa mine.
Intro adapted from Wikipedia (CC BY-SA).
Osarizawaite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Pb(Al₂Cu²⁺)(SO₄)₂(OH)₆.
It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Alunite-Alunite structural group.
Key properties: Mohs hardness 3.5; specific gravity 3.89–4.04; refractive index 1.815; optically uniaxial.
IMA symbol Orz, IMA status: approved, named in 1961.
Occurs as an uncommon mineral in the oxidized zone of hydrothermal Pb–Zn–Cu deposits.
It is found associated with Anglesite, beaverite, hidalgoite, duftite, bindheimite, conichalcite, olivenite, quartz, clay, goethite.
The name refers to its first-noted occurrence in the Osarizawa mine, Japan.