Images
Formula: SiO2
Oxide, metastable
paramorph of coesite,
cristobalite, mogánite,
quartz, quartz-beta,
seifertite, stishovite,
tridymite, UM2000-61-SiO and
xiexiandeite
The name is for the synthetic material. It is unnamed as a mineral but probably valid (Mindat)
Localities
The Kokchetav Massif, Zerendi District, Akmola Region, Kazakhstan, is the locality of the first natural occurrence
of keatite, discovered as a precipitate in the core of ultrahigh-pressure
clinopyroxene within garnet
pyroxenite. Clinopyroxene
provides a template for keatite nucleation due to the close structural relationship and excellent lattice
match between the diopside and keatite. It is proposed that
keatite micro-precipitates are formed in localised low-pressure micro-environments produced as a result of
exsolution of extra silica and vacancies held within ultrahigh-pressure host
diopside and stabilised by the
pyroxene lattice
(AM 98.1.187-196).
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