Dorallcharite
Dorallcharite is an IMA-recognized mineral species in the sulfate class, with the chemical formula TlFe³⁺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 3.85; Yellow streak; optically uniaxial.
IMA symbol Drc, IMA status: approved, named in 1992.
Found in oxidized portions of a Tl-bearing hydrothermal sulfide-sulfosalt deposit.
It is found associated with Amorphous Fe–Mn arsenate-sulfate, gypsum, bassanite, rösslerite, pharmacosiderite, melanterite, barite.
The name comes from the French doré, golden yellow, and the famous mining locality, Alšar (Allchar), Macedonia.
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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