Koashvite
Koashvite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₆CaTiSi₆O₁₈.
It crystallizes in the orthorhombic crystal system. It is a member of the Lovozerite-Koashvite structural group.
Key properties: Mohs hardness 6; specific gravity 2.98–3.02; Vitreous luster; optically biaxial.
IMA symbol Koa, IMA status: approved, named in 1973.
Occurs as veinlets replacing lomonosovite in an ultra-agpaitic pegmatite in an alkalic massif.
It is found associated with Lomonosovite, pectolite, villiaumite, natrophosphate.
The name is derived from the locality, Mt. Koashva, Kola Peninsula, 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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