What does the word silica mean?

Usage examples for 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 by 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 by Alva Agee
  3. The walls of these spaces are said in some cases to contain a considerable amount of silica. – Freshwater Sponges, Hydroids & Polyzoa by Nelson Annandale