Hydroniumjarosite
Hydroniumjarosite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (H₃O)Fe³⁺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: Mohs hardness 4–4.5; specific gravity 2.5–2.9; Dull to resinous luster; optically uniaxial.
IMA symbol Hjrs, IMA status: approved, named in 1960.
Found in the oxidized zone of rapidly weathering sulfide-bearing rocks; may be of post-mining formation.
It is found associated with Melanterite, goethite.
As the H3O+, hydronium, analog of jarosite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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