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Meaning of felsic

fel•sic

Pronunciation: (fel'sik), [key]
— adj. Geol.
  1. (of rocks) consisting chiefly of feldspars, feldspathoids, quartz, and other light-colored minerals. Cf. mafic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.