Chlorkyuygenite
Chlorkyuygenite is an IMA-recognized mineral species in the halide class, with the chemical formula Ca₁₂Al₁₄O₃₂[(H₂O)₄Cl₂].
It crystallizes in the cubic crystal system (space group I-43d). It is a member of the Mayenite structural group.
Key properties: Mohs hardness 5–5.5; specific gravity 2.941; White streak; Vitreous luster.
IMA symbol Cky, IMA status: approved, named in 2012.
An accessory mineral in Ca-humite zones of calcareous skarn xenoliths in ignimbrite, crystallized initially as chlormayenite and was altered by volcanic gases containing water vapor.
It is found associated with Chegemite-fluorchegemite, reinhardbraunsite, srebrodolskite.
Kyuygenite is for the locality, Kyuygen-Kaya Mountain and the prefix indicates the essential chlorine in the species.