tridymite

Noun
  1. A mineral form of silica (synset 115104124)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    substance holonym: silica, silicon dioxide, silicon oxide - a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite

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