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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. Most mafic minerals are dark
Basalt
Basalt
Apatite
Apatite
An ʻaʻā flow from Mauna Loa (a volcano in Hawaii), composed of mafic magma.
An ʻaʻā flow from Mauna Loa (a volcano in Hawaii), composed of mafic magma.
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.
A felsic volcanic lithic fragment, as seen in a petrographic microscope. Scale box is in millimeters.
Close-up of granite from Yosemite National Park.
Close-up of granite from Yosemite National Park.
A specimen of rhyolite.
A specimen of rhyolite.