In the classification of igneous rocks, which term refers to rocks that are rich in silica (usually greater than 66%) and contain light-colored minerals such as quartz and potassium feldspar?

💡 Solution & Explanation

Felsic igneous rocks are rich in silica, generally exceeding sixty-six percent, and are dominated by light-colored minerals such as quartz and potassium feldspar. In contrast, mafic and ultramafic rocks contain lower silica percentages and higher proportions of heavier, dark-colored minerals like pyroxene and olivine. Granite is the most common intrusive felsic rock found in continental crust formations.