felsic

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fel·sic

 (fĕl′sĭk)
adj.
Relating to or containing a group of light-colored silicate minerals that occur in igneous rocks, including minerals of the feldspathoid group and the minerals quartz, feldspar, and muscovite.

felsic

(ˈfɛlsɪk)
adj
(of minerals) predominantly composed of feldspars or silicates