Sentence Examples


  • The rocks are probably of quartz, i.e.
  • Jacquerod and Perrot have found that quartz-glass is freely permeable to helium below a red-heat (Comet.
  • Gold is obtained chiefly from quartz reefs, but there are still some important alluvial deposits being worked.
  • The Upper Devonian was a period of marine retreat; the crustal disturbances of the Lower Devonian were renewed and great quartz-pebble beaches were formed on the rising shore lines, producing the West Coast Range conglomerates of Tasmania, and the similar rocks to the south-east of Mansfield in Victoria.
  • The greatest development of quartz reefing is found in Victoria, some of the mines being of great depth.