silicon dioxide

1. 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 (synset 115065844)
   is a type of: oxide - any compound of oxygen with another element or a radical
   subtypes:

   • chert - variety of silica containing microcrystalline quartz
   • flint - a hard kind of stone; a form of silica more opaque than chalcedony
   • silex - a pure form of finely ground silica
   substance meronym:

   • cristobalite - a white mineral consisting of silica; found in volcanic rocks
   • quartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
   • crystal, lechatelierite, quartz, quartz glass, vitreous silica - colorless glass made of almost pure silica
   • tridymite - a mineral form of silica
   same as: silica, silicon oxide

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