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  • noun

Words related to cristobalite

a white mineral consisting of silica

References in periodicals archive ?
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.
In the ash generated at Soufriere Hills by pyroclastic flows--mixtures of volcanic ash and gases that hug the ground and flow down valleys--the team found high levels of a form of crystalline silica called cristobalite, which is known to cause silicosis.
This final hold allows for the transformation from tridymite to cristobalite.
Above this temperature, cristobalite will form, depending on time temperature and particle size of the flours and grains.
The remaining portion is amorphous (glass) and contains minor amounts of cristobalite (3%) and quartz (< 1%).
Fluxes decrease the temperature at which the silica starts to soften and provides liquid on the surface of the grains, increasing the reactivity and lowering the transition temperatures for tridymite and cristobalite.
It contains a high percentage of mont-morillonite, accompanied by considerable amount of non-clay materials, including, quartz, feldspar and cristobalite as impurities (Gannouni and Bellagi, 2001).
Rohm and Haas Company has been granted a patent for a composite comprised of a first substrate, a second substrate, and an adhesive composition bonding the substrates together, wherein the adhesive composition comprises 1-50% by weight based on the weight of the composition of cristobalite silica, and 50-99% by weight based on the weight of the composition of moisture curable prepolymer, wherein the moisture curable prepolymer comprises at least one urethane prepolymer comprising the reaction product of at least one polyol and at least one isocyanate bearing at least two isocyanate groups.
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.