Part of speech: noun

A hard, crystalline substance, the principal constituent of quartz and sand.

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Usage examples "silica":

  1. Granite is a compound of feldspar, quartz, and mica, the feldspars being rich in silica, which forms from 60 to 70 per cent of the whole aggregate. - "The Student's Elements of Geology", Sir Charles Lyell.
  2. In this material are the abundant supplies of such plant- food as silica, but, as has been previously stated, their very abundance leads us rightly to disregard them in our thinking. - "Crops and Methods for Soil Improvement", Alva Agee.
  3. The walls of these spaces are said in some cases to contain a considerable amount of silica. - "Freshwater Sponges, Hydroids & Polyzoa", Nelson Annandale.