The off-white laths are lintisite crystals and the pink background is ussingite. From: Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada. — Photo: Jerry Cone · CC0
Lintisite
Lintisite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₃LiTi₂O₂(SiO₃)₄·2H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 5–6; specific gravity 2.77; Vitreous on fractures, pearly on cleavages luster; optically biaxial.
IMA symbol Lts, IMA status: approved, named in 1989.
Coating and replacing lorenzenite in ultra-agpaitic syenite pegmatites in a differentiated alkalic massif (Lovozero massif, Russia); in sodalite xenoliths in an intrusive alkalic gabbro-syenite complex (Mont Saint-Hilaire, Canada).
It is found associated with Lorenzenite, nepheline, sodalite, potassic feldspar, arfvedsonite, aegirine, eudialyte, ussingite, gmelinite (Lovozero massif, Russia); ussingite, natrolite.
The name refers to LIthium, sodium (Natrium), TItanium, and SIlicon in the composition.