Natroaphthitalite
Natroaphthitalite is an IMA-recognized mineral species in the sulfate class, with the chemical formula KNa₃(SO₄)₂.
It crystallizes in the hexagonal crystal system (space group P-3m1). It is a member of the Aphthitalite structural group.
Key properties: Mohs hardness 3; specific gravity 2.69; White streak; Vitreous to waxy luster; optically uniaxial.
IMA symbol Natt, IMA status: approved, named in 2018.
Forms as a sublimate at an active volcanic fumarole.
It is found associated with Anhydrite, langbeinite, hematite, tenorite, As-bearing sanidine, johillerite, tilasite, belomarinaite.
The prefix indicates the analogue of aphthitalite with total Na > K and in the Y site.
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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