Relating to or denoting a group of light-colored minerals including feldspar, feldspathoids, quartz, and muscovite. Often contrasted with mafic.
- 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.
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