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Silica 1

Definition: Silicon dioxide, SiO/. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.

silica 2

Definition: 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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