Definitions
feldspar Tweet Definition of feldspar Like Definition of feldspar on Facebook
noun 
  1. (mineralogy) A large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks.
Etymology: Feld, field (from Middle High German veld, from Old High German feld) + Spath, spar


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