Imandrite
Imandrite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₁₂Ca₃Fe³⁺₂Si₁₂O₃₆.
It crystallizes in the orthorhombic crystal system (space group Pmnn). It is a member of the Lovozerite-Imandrite structural group.
Key properties: Mohs hardness 4; specific gravity 2.93; Vitreous luster; optically biaxial.
IMA symbol Ima, IMA status: approved, named in 1979.
Found in apatite-bearing alkalic pegmatitic rocks in a differentiated alkalic massif.
It is found associated with Eudialyte, aegirine, orthoclase, alkalic amphibole, pectolite.
The name refers to Lake Imandra on the Kola Peninsula, Russia.
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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