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1. A white or colourless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
   - silicon oxide, silicon dioxide

Derived forms: silicas

See also: silicious

Type of: oxide

Part of: cristobalite, crystal, lechatelierite, quartz, quartz glass, tridymite, vitreous silica

Encyclopedia: Silica, Roznava Silica, Minnesota Silica Silica, Rožňava District Silica, Rožňava Silica, Roznava District