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cristobalite

A Dictionary of Earth Sciences | 1999 | 365 words | Copyright

cristobalite A high temperature form of quartz SiO2 which has a stability field at atmospheric pressure above 1470°C and below 1713°C, at which latter temperature cristobalite melts and the quartz liquidus is reached; sp. gr. 2.32; occurs as fine aggregates in cavities in basalts and in some thermally metamorphosed (see CONTACT METAMORPHISM) sandstones.

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