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
   "Silica is the main component of sand";
   - silicon oxide, silicon dioxide

Derived forms: silicas

Type of: oxide

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

Encyclopedia: Silica, Roznava District