1. relating to or denoting igneous rock that is rich in feldspar and silica and relatively light in color and density
Usage: geology; technical

Examples

• Granite is a common felsic igneous rock composed mainly of feldspar and quartz.
• Felsic magma tends to be more viscous than mafic magma.
• The felsic composition of the rock made it lighter in appearance than basalt.
• Geologists classify rhyolite as a felsic volcanic rock.
• Felsic rocks typically have a lower density compared to ultramafic rocks.