:FOV 2.7 x 2.2 mm. Via Jean-Pierre Beckerich. This is from the same analyzed find as http://www.mindat.org/photo-177620.html Note the orangey color of the terminations. This depends on the orientation of the light source. Crystals from this find were thoroughly analyzed via long exposure XRD and EDS. Locality: Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada — Photo: Modris Baum · CC0
Tundrite-(Ce)
Tundrite-(Ce) is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₂Ce₂TiO₂(SiO₄)(CO₃)₂.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Tundrite structural group.
Key properties: Mohs hardness 3; specific gravity 3.7–4.12; Yellowish gray to white streak; Vitreous to adamantine luster; optically biaxial.
IMA symbol Tnd-Ce, IMA status: approved, named in 1965.
Found in pegmatite veins in association with nepheline syenites.
It is found associated with Aegirine, lamprophyllite, lorenzenite, rhabdophane (Mt. Lepkhe-Nelm, Russia); natrolite, microcline, albite, aegirine, fluorite, rinkite.
The name commemorates the Lovozero massif (formerly the Lovozero tundra), Kola Peninsula, Russia, where it was discovered, and a suffix for the cerium content.