Puninite
Puninite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Na₂Cu₃O(SO₄)₃.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Euchlorine structural group.
Key properties: Mohs hardness 2–3; specific gravity 3.298; Greenish streak; Vitreous luster; optically biaxial.
IMA symbol Pun, IMA status: approved, named in 2015.
Found as a sublimate around an active fumarole.
It is found associated with Lammerite-β, tenorite, hematite, anhydrite.
The mineral was named to honor crystallographer, Professor Yurii Olegovich Punin (1941-2014), St. Petersburg State University, Russia.
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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