Argentojarosite from Bristol Silver Mines Inc., Bristol and Jackrabbit Districts, Lincoln Co., Nevada, USA — Photo: Rock Currier · CC BY 3.0
Argentojarosite
Argentojarosite is an iron sulfate mineral with the chemical formula AgFe3+3(SO4)2(OH)6. It is one of few iron sulfate minerals containing silver in its chemical formula as a dominant element. Its type locality is the East Tintic Mountains, Utah.
Intro adapted from Wikipedia (CC BY-SA).
Argentojarosite is an IMA-recognized mineral species in the sulfate class, with the chemical formula AgFe³⁺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 3.66; Adamantine luster; optically uniaxial.
IMA symbol Agjrs, IMA status: approved, named in 1923.
Occurs as an uncommon secondary mineral in the oxidized portions of silver- and sulfide-bearing mineral deposits.
It is found associated with Anglesite, barite, quartz (Tintic Standard mine, Utah, USA).
As the silver, argentum, analog of jarosite.