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(Minerals) a white microcrystalline mineral consisting of silica and occurring in volcanic rocks. Formula: SiO2
[C19: from German, named after Cerro San Cristóbal, Mexico, where it was discovered]
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|Noun||1.||cristobalite - a white mineral consisting of silica; found in volcanic rocks|
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition