cristobalite


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cristobalite

[kri′stō·bə‚līt]
(mineralogy)
SiO2 A silicate mineral that is a high-temperature form of quartz; stable above 1470°C; crystallizes in the tetragonal system at low temperatures and the isometric system at high temperatures.
References in periodicals archive ?
Granules are composed of amorphous phase, can emit one mineral cristobalite of which small amount can be found both in smaller and bigger granules.
Regarding secondary minerals, they are dominated by smectite, illite, cristobalite and goethite, which are expandable minerals; in addition, these soils present prominent sliding surfaces on the faces of the prisms or surrounding the rocks.
It should be noted that none of the analyzed samples contained cristobalite or tridymite, with all of the reported crystalline content resulting from quartz.
Once cristobalite is formed, the clay body expands upon heating and contracts upon cooling suddenly at that temperature range and will break if the rise or drop in temperature is too great.
The mineral assemblage is characterized by feldespar + quartz + cristobalite + smectite + kaolinite + pyrite.
3] is necessary to eliminate any residual trace amount of cristobalite and enhance the erosion resistance of the mullite coating.
Though considered a non-hazardous nuisance dust, amorphous precipitated silica can be transformed through traditional convective/conductive heating into crystalline forms such as cristobalite that are known respiratory hazards.
Precision-classified Minbloc[R] grades produced from microcrystalline silica, cristobalite, or nepheline syenite are available for clarity and high-clarity blown and cast flexible-packaging and agricultural-film applications.
Paint Latex/latex: primer = water, quartz, acrylic resin, titanium dioxide, alkyd resin, silica cristobalite, silica, isobutyrate ester, zinc oxide, ethylene glycol, octylisothiazolone; top coat = water, acrylic vinyl polymer, titanium dioxide, acrylic resin, propylene glycol, diethylene gylcol, monobutyl ether, silica, octylisothiazolone Alkyd/latex: primer = talc, mineral spirits, tall oil alkyd polymer, titanium dioxide, soya alkyd polymer, mica, mineral spirits 140-flash, cristobalite, amorphous diatomaceous earth; top coat = water, acrylic polymer, titanium dioxide, zinc oxide, ethylene glycol, quartz, cristobalite Preservative-treated lumber Nominal 1-inch southern pine boards: CCA-C 0.
No other forms of crystalline silica were detected in any air samples except for a one-time detection of cristobalite (15 micrograms per cubic meter [[micro]g/[m.
016 81 Site Plastic limit Guzman 3 Ajuno 6 Casas Blancas 12 Tepatitlan 16 Apatzingan 58 Morelia 49 + MT = montmorillonite, FD = feldspar, CR = cristobalite, NX = non-crystaline, KK = kaolinite, HE = hematite.