Kokchetavite
Kokchetavite is an IMA-recognized mineral species in the silicate class, with the chemical formula K(AlSi₃O₈).
It crystallizes in the hexagonal crystal system. It is a member of the Dmisteinbergite structural group.
Key properties: specific gravity 2.45; optically biaxial.
IMA symbol Kct, IMA status: approved, named in 2004.
Occurs as inclusions in clinopyroxene and garnet within ultrahigh-grade granitic and biotite gneiss (estimated 900-1000 oC and 5.8-6.5 GPa).
It is found associated with Diopside, grossular-rich garnet, phengite mica, potassium feldspar, pyrrhotite, cristobalite, quartz, titanite, zircon, talc.
The name is derived from the locality of the first specimens, the Kokchetav Massif.
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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