felsic








adjective Geology.

  1. (of rocks) consisting chiefly of feldspars, feldspathoids, quartz, and other light-colored minerals.
adj.

1912, from feldspar + silica + -ic.

  1. Relating to an igneous rock that contains a group of light-colored silicate minerals, including feldspar, feldspathoid, quartz, and muscovite. Compare mafic.

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