cristobalite

/K R IH1 S T AH0 B AH0 L AY0 T/
noun
  1. 1

    A mineral of volcanic rocks that solidified at a high temperature. Cristobalite is chemically identical to quartz, with the chemical formula SiO2, but has a different crystal structure. Crystals are always microscopic, and usually form small rounded masses.

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Source: https://en.wiktionary.org/wiki/cristobalite