The definition :
Definitions of silica:
- noun: 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
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:silicon dioxide silicon oxide oxide chert flint silex argillite basic slag cristobalite crystal diatom lechartelierite lechatelierite ocher ochre opal quartz quartz glass silica gel siliceous silicic acid silicious silicosis tridymite vitreous silica
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