Outstanding pale yellow natisite crystals from the type and one of the very few localities known worldwide (Karnasurt Mountain, Lovozero Massif, Murmansk Oblast, Russian Federation), all of them in the Kola peninsula. From the material used in the description of the mineral (holotype). Ex.Dr.Hartel collection. — Photo: David Hospital · CC BY-SA 4.0
Natisite
Natisite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₂TiO(SiO₄).
It crystallizes in the tetragonal crystal system (space group P4/nmm).
Key properties: Mohs hardness 3–4; specific gravity 3.15; Vitreous to adamantine luster; optically uniaxial.
IMA symbol Nts, IMA status: approved, named in 1974.
Found in natrolite-ussingite veins cutting alkalic rocks in a differentiated alkalic massif.
It is found associated with Chkalovite, aegirine, vuonnemite.
The name refers to sodium, NAtrium, TItanium, and SIlicon in the composition.