Ivsite
Ivsite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Na₃H(SO₄)₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: specific gravity 2.406; White streak.
IMA symbol Ivs, IMA status: approved, named in 2013.
Forms as a sublimate at an active volcanic fumarole (Kamchatka); secondary in the post-mining oxidation zone of asphaltum-rich sandstone beds laced with uraninite and sulfides in a damp underground environment (Utah).
It is found associated with Copiapite, ferrinatrite, metavoltine, römerite, seaborgite, gypsum (Utah).
The name commemorates the Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences.
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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