| Definitions | | cristobalite |
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noun
- (mineralogy) A mineral of volcanic rocks that solidified at a high temperature. Cristobalite is chemically identical to quartz, but has a different crystal structure. Crystals are always microscopic, and usually form small rounded masses.
- Chemical composition: Silicon dioxide, <math>SiO?_2</math>
Etymology: Named for the type locality at Cerro San Cristóbal, Mexico.
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