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.

synonyms: silica, silicon oxide.

Dutch: silicium dioxyde, kiezelzuur, siliciumdioxyde
Polish: krzemionka, ditlenek krzemu, dwutlenek krzemu