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definition of the word feldspar

by the Wiktionnary

Feldspar

Feld, field (from Middle High German veld, from Old High German feld) + Spath, spar

Singular
feldspar

Plural
feldspars

feldspar (plural feldspars)

  1. (mineralogy) Any of 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.


Definition from Wiktionary
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