felsic

[fel-sik]

adjective Geology.

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

Compare mafic.

Origin of felsic

First recorded in 1910–15; fel(dspar) + s(ilica) + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for felsic
adj.

1912, from feldspar + silica + -ic.

Online Etymology Dictionary, © 2010 Douglas Harper

felsic in Science

felsic

[fĕlsĭk]

Relating to an igneous rock that contains a group of light-colored silicate minerals, including feldspar, feldspathoid, quartz, and muscovite. Compare mafic.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.