Definition of “feldspar” - English Dictionary


“feldspar” in English

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feldsparnoun [ C or U ]

uk /ˈfeld.spɑːr/ us /ˈfeld.spɑːr/ specialized

Examples from literature

  • It contains a large proportion of mica, a small proportion of quartz and still less feldspar, but generally an abundance of iron pyrites in very minute crystals, which, on exposure, are decomposed. 
  • It is the metallic base of mica, feldspar, slate, and clay. 
  • It was made of black, glassy lava mixed with bits of feldspar. 
  • The purest clay found in nature is porcelain clay, or kaolin, which results from the decomposition of a rock composed of feldspar and quartz, and it is almost always mixed with quartz. 
  • What little feldspar there was is reduced to quartz and mica, and the quartz pebbles are drawn out into lenses. 

(Definition of “feldspar” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)