Yellow kazakovite with white thermonatrite. Field of view 3 mm. From: Kedykverpakhk Mt, Lovozero Massif, Murmansk Oblast, Russia. — Photo: Leon Hupperichs · CC BY-SA 3.0
Kazakovite
Kazakovite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₆Mn²⁺TiSi₆O₁₈.
It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Lovozerite-Zirsinalite–Lovozerite structural group.
Key properties: Mohs hardness 4; specific gravity 2.84; Vitreous to greasy luster; optically uniaxial.
IMA symbol Kzk, IMA status: approved, named in 1973.
Found in sodalite-rich syenites in an alkalic massif (Lovozero massif, Russia).
It is found associated with Nordite, belovite, vuonnemite, alkalic feldspars, ussingite (Lovozero massif, Russia); villiaumite, delhayelite, lamprophyllite, lomonosovite, feldspars.
The name refers to Mariya Efimovna Kazakova (1913–1982), Institute of Mineralogy and Geochemistry of Rare Elements, Moscow, Russia, analytical chemist who provided the mineral's analysis.