(n) 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, Syn.silicon oxide, silicon dioxide
n. [ NL., from L. silex, silics, a flint. ] (Chem.) Silicon dioxide, SiO&unr_;. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder. [ 1913 Webster ]
n.[ Cf. F. silicate. ] (Chem.) A salt of silicic acid. [ 1913 Webster ]
☞ In mineralogical chemistry the silicates include; the unisilicates or orthosilicates, salts of orthosilicic acid; the bisilicates or metasilicates, salts of metasilicic acid; the polysilicates or acid silicates, salts of the polysilicic acids; the basic silicates or subsilicates, in which the equivalent of base is greater than would be required to neutralize the acid; and the hydrous silicates, including the zeolites and many hydrated decomposition products. [ 1913 Webster ]
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