Composition (Part 2)
Felsic Minerals
• Light-colored minerals such as muscovite mica, orthoclase feldspar, sodium-rich feldspar, and quartz tend to occur together. They form light-colored igneous rocks described as felsic.
Typical minerals found in felsic rocks (Photographs by Parvindter Sethi)
Felsic minerals include muscovite (top left), sodium-rich plagioclase feldspar (top right), orthoclase feldspar (bottom left), and quartz (bottom right). These minerals are light-colored and often occur together in felsic igneous rocks.
Granite (Photograph by Parvinder Sethi)
Granite, shown here, is an example of a felsic igneous rock. Light colored grains are quartz and orthoclase feldspar. Small black crystals are biotite mica.