Eltyubyuite
Eltyubyuite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₁₂Fe³⁺₁₀Si₄O₃₂Cl₆.
It crystallizes in the cubic crystal system (space group I-43d). It is a member of the Mayenite structural group.
Key properties: specific gravity 3.349.
IMA symbol Elt, IMA status: approved, named in 2011.
From a thermally-altered carbonate-silicate xenolith (20 m long) in ignimbrite that created sanidinite facies metamorphism (Upper Chegem Caldera).
It is found associated with Larnite, rondorfite, wadalite, hydroxylellestadite, edgrewite-hydroxyledgrewite, chegemite-fluorchegemite, cuspidine, lakargiite, perovskite, kerimasite.
The name refers to the historically famous Balkarian village Eltyubyu, which is located near the site from which the first specimens were collected.