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Word: feldspar (lookup usage) (lookup stats)


Meaning:

Noun:

  • 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.

Source: Wiktionary | Src Info »