Seidozerite Locality: Pegmatite No. 58, Muruai and Uel'kuai rivers, Seidozero Lake, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia Reddish-brown Seidozerite (analysed) Field of view 8 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Seidozerite
A titanium disilicate namesake of its supergroup, described in 1958 from Kola Peninsula pegmatites.
Intro adapted from Wikipedia (CC BY-SA).
Seidozerite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₂Zr₂Na₂MnTi(Si₂O₇)₂O₂F₂.
It crystallizes in the monoclinic crystal system (space group P2/c). It is a member of the Seidozerite-Rinkite structural group.
Key properties: Mohs hardness 4–5; specific gravity 3.472; Vitreous luster; optically biaxial.
IMA symbol Sdz, IMA status: approved, named in 1958.
Found in thin veins in nepheline syenite pegmatites in a differentiated alkalic massif (Lovozero massif, Russia).
It is found associated with Microcline, aegirine, nepheline, apatite, pyrochlore, magnetite, ilmenite, titanian lº a venite, eudialyte (Lovozero massif, Russia).
The name refers to the Lake Seidozero region, Kola Peninsula, Russia, near which the mineral occurs.