These mineral images are free to use how you wish. — Photo: Dave Dyet http://www.shutterstone.com http://www.dyet.com · Public domain
Murmanite
Murmanite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₂Ti₂Na₂Ti₂(Si₂O₇)₂O₄(H₂O)₄.
It crystallizes in the triclinic crystal system (space group P1). It is a member of the Seidozerite-Murmanite structural group.
Key properties: Mohs hardness 2–3; specific gravity 2.76–2.84; Vitreous on cleavages, greasy on fractures luster; optically biaxial.
IMA symbol Mmn, IMA status: approved, named in 1930.
Found in pegmatites and associated igneous rocks of alkalic complexes, as a primary magmatic mineral or altered from lomonosovite.
It is found associated with Lomonosovite, aegirine, arfvedsonite, neptunite, microcline, albite, natrolite, analcime, nepheline, sodalite, eudialyte, lorenzenite, lamprophyllite, rinkite.
The name refers to the Murman coast on the northern side of the Kola Peninsula, Russia.