Definition of felsic in English:

felsic

adjective

Geology
  • Relating to or denoting a group of light-coloured minerals including feldspar, feldspathoids, quartz, and muscovite.

    ‘felsic volcanic rocks’
    Often contrasted with mafic
    • ‘The enclaves probably represent globules of mafic magma in felsic magma.’
    • ‘The rocks of the complex show an overall trend of decreasing mafic minerals and increasing felsic minerals spatially from west to east.’
    • ‘The present day volumetric variation in the amount of mafic and felsic volcanic rocks preserved in the Parana and Etendeka provinces is interesting.’
    • ‘The alternating bands of mafic and felsic minerals are a striking and distinctive feature of all gneisses.’
    • ‘Local hybridization between the mafic and felsic magmas is common.’

Origin

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

Pronunciation:

felsic

/ˈfɛlsɪk/