Silicon dioxide definition

Silicon dioxide

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noun

(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 lechartelierite

WiktionaryText

Noun

A hard glassy mineral, SiO₂, occurring as quartz, sand, opal etc. Informally known as silica.