Plumbojarosite Locality: Richmond-Eureka mine (Ruby Hill mine), Ruby Hill, Eureka District, Eureka County, Nevada, USA Original description: A heavy 6.4 by 4.3 cms mass. JSS specimen and photo. — Photo: John Sobolewski (JSS) · CC BY 3.0
Plumbojarosite
Plumbojarosite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Pb₀.₅Fe³⁺₃(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: specific gravity 3.64–3.67; Vitreous, silky to dull luster; optically uniaxial.
IMA symbol Pjrs, IMA status: approved, named in 1902.
Formed by the reaction between galena and oxidizing pyrite in lead deposits, typically in arid regions.
It is found associated with Jarosite, anglesite, “limonite”.
As the lead, plumbum, analog of jarosite.