Felsic
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In geology, felsic is a modifier describing igneous rocks that are relatively rich in elements that form feldspar and quartz. It is contrasted with mafic rocks, which are richer in magnesium and iron.
A felsic volcanic lithic fragment, as seen in a petrographic microscope. Scale box is in millimeters.
Close-up of granite from Yosemite National Park.
A specimen of rhyolite.
Mafic
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Mafic is a term used in geology to describe silicate minerals, magmas, and igneous rocks that are rich in magnesium and iron, while being relatively low in silica content. Common rock-forming mafic mi
Felsic
…In geology, felsic is a modifier describing igneous rocks that are relatively rich in elements that form feldspar and quartz. It is contrasted with mafic rocks, which are richer in magnesium and iron. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as…
Basalt
Apatite
An ʻaʻā flow from Mauna Loa (a volcano in Hawaii), composed of mafic magma.