coesite


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coesite

[′sē‚zīt]
(mineralogy)
A high-pressure polymorph of SiO2 formed in nature only under unique physical conditions, requiring pressures of more than 20 kilobars (2 gigapascals); usually found in meteor impact craters.
References in periodicals archive ?
Coesite discoveries establish cryptovolcanics as fossil meteorite craters.
Its atoms aggregate in forms as common as quartz crystals and as exotic as coesite and stishovite, minerals formed by the intense pressures generated when extraterrestrial objects such as comets and asteroids strike Earth's surface (SN: 6/15/02, p.
25 Years After The Discovery Of Coesite And Diamond" to their offering.
The discipline was established -25 years ago after discoveries of high pressure minerals, coesite and diamond, in the rocks of the continental affinities, a place where such minerals are "forbidden"according to main geological concepts.
UHPM rocks consist of the fragments of continental and oceanic crustal rocks and associated mafic-ultramafic intrusions and/or mantle peridotite initially formed at shallow lithosphere, but which subsequently have experienced a recrystallization within or above coesite and diamond stability fields (>2.
Its impact origin was confirmed with the discovery of shatter cones (Dietz 1960), shocked quartz (Carlton and others 1998; Koeberl and others 1998), and coesite (Cohen and others 1961) and is supported by the enrichment of siderophile elements at the center of the structure (Carlton and others 1998; Koeberland others 1998).
When researchers recently fired single-wavelength beams of X rays and then laser light through two small crystals of coesite trapped in a Venezuelan diamond, the patterns of light scattering from the crystals revealed that the material's atoms are more closely packed than they are at atmospheric pressure.
The distances between atoms in the coesite indicated that the material is currently under a pressure of about 36,000 atm.
DF died / fief DH dumdum / humhum DJ dingledangle / jinglejangle DL dowdy / lowly DN dogged / noggen DR dashed / rasher DT dread / treat DW dada / wawa DZ danda / zanza DG danda / ganga DI odd / oii DK deled / kelek DM daytide / Maytime DP daddies / pappies DS coedited / coesites DV dad / vav DY dawned / yawney