quartz

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• February 10. 2013 from wordnet.princeton.edu

  quartz — noun — english

  colorless glass made of almost pure silica

• March 2. 2016 from wordnet.princeton.edu

  quartz — noun — english

  a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities