felsic

[fel-sik]
adjective Geology.
(of rocks) consisting chiefly of feldspars, feldspathoids, quartz, and other light-colored minerals.
Compare mafic.


Origin:
1910–15; fel(dspar) + s(ilica) + -ic

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

felsic
1912, from feldspar + silica + -ic.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
felsic   (fěl'sĭk)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The interior of a flow cools slower, so the light-colored felsic minerals are also able to crystallize.
The chemical composition of igneous rock can be broken into four main types: felsic, intermediate, mafic and ultramafic.
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