Intermediate was the likely composition of the source of that magma.
Felsic minerals, magma, and rocks are silicate minerals rich in lighter elements such as silicon, oxygen, aluminum, sodium, and potassium. The viscosity of felsic magma or lava is greater than that of mafic magma/lava. Felsic rocks are typically light in color with specific gravities less than three.
When describing rocks or lava, mafic denotes that the lava or rock contains less silica, whereas felsic denotes that the lava or rock contains the most silica.
The melting beneath the continental crust produces felsic magmas. The magma cools and crystallizes as it rises through the crust and to the surface.
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