Kerimasite
Kerimasite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₃Zr₂(SiFe³⁺₂)O₁₂.
It crystallizes in the cubic crystal system (space group Ia3d). It is a member of the Garnet structural group.
Key properties: Mohs hardness 7; specific gravity 4.104; Vitreous luster; optically isotropic.
IMA symbol Kms, IMA status: approved, named in 2009.
A magmatic phase in calcite carbonatite in association with a nephelinitic volcano (Kerimasi) and surrounding pyroclastic rocks (carbonatite agglomerates and tuffs).
It is found associated with Calcite, rarely fluorapatite and magnesioferrite.
The name refers to the Kerimasi volcano in Tanzania.
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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