Definition of felsic in English:

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Pronunciation: /ˈfɛlsɪk/


Relating to or denoting a group of light-coloured minerals including feldspar, feldspathoids, quartz, and muscovite: felsic volcanic rocks Often contrasted with mafic.
More example sentences
  • The present day volumetric variation in the amount of mafic and felsic volcanic rocks preserved in the Parana and Etendeka provinces is interesting.
  • The rocks of the complex show an overall trend of decreasing mafic minerals and increasing felsic minerals spatially from west to east.
  • The alternating bands of mafic and felsic minerals are a striking and distinctive feature of all gneisses.


Early 20th century: from feldspar + a contraction of silica.

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Line breaks: fels¦ic

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