An extremely rare thallium mineral in crystallized form (IMA 2011-054) as metallic black crystals. From: Monte Arsiccio Mine, Apuan Alps, Tuscany, Italy — Photo: David Hospital · CC BY-SA 4.0
Protochabournéite
Protochabournéite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Tl₄₋ₓPb₂₊₂ₓSb₂₀₋ₓ₋ᵧAsᵧS₃₄ (with 0.02 ≤ x ≤ 0.34, 5.71 ≤ y ≤ 6.69).
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Chabournéite structural group.
IMA symbol Pchb, IMA status: approved, named in 2011.
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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