Zemkorite
Zemkorite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Na₂Ca(CO₃)₂.
It crystallizes in the hexagonal crystal system.
Key properties: Mohs hardness 2; specific gravity 2.46; Vitreous to pearly luster; optically uniaxial.
IMA symbol Zmk, IMA status: approved, named in 1985.
Filling fractures and as inclusions in unserpentinized but sodium metasomatized kimberlite at about 400–450 m depth.
It is found associated with Shortite, halite.
The name refers to Institute of the Earth’s Crust (Institut ZEMnoy KORY in Russian), Russian Academy of Sciences, Siberian Branch, Irkutsk, Russia, where the mineral was studied.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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