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Encyclopedia > Cristobalite

Common in volcanic rocks, cristobalite is a high-temperature polymorph of quartz and tridymite. It occurs as white octahedra in acidic volcanic rocks. Cristobalite is stable only above 1470 degrees centigrade (American Geological Institute Dictionary of Geological Terms).

  Results from FactBites:
CRISTOBALITE (Silicon Dioxide) (560 words)
Cristobalite is common in volcanic rocks and many microscopic crystals are easily seen in a petrographic microscope.
Most cristobalite is believed to crystallize as beta cristobalite which has an isometric symmetry and later as the crystal cools, it easily converts to alpha cristobalite or just cristobalite.
The conversion from beta cristobalite to cristobalite is so easy that the beta cristobalite's isometric crystals are outwardly preserved in their original form.
United States Patent Application: 0030109624 (3721 words)
The composition of claim 5 wherein said cristobalite silica is a powder with mean particle size of from 1 to 3 micrometers and maximum particle size of 25 micrometers and wherein the amount of said cristobalite silica is 9% to 16% by weight based on the weight of said composition.
Cristobalite silica is preferably added during a time when the reaction mixture has low enough viscosity to be stirred, so that the cristobalite silica can be mixed with the other components.
Cristobalite silica may be added to the RP prepolymer in the same manners and amounts as in the one- and two-stage processes.
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