Mafic meaning
Relating to or containing a group of dark-colored silicate minerals, composed chiefly of magnesium and iron, that occur in igneous rocks, including hornblende, pyroxene, olivine, and biotite.
adjective
Of or pertaining to igneous rocks that are rich in dark-colored minerals and that contain magnesium and iron and a comparatively low level of silica.
adjective
Relating to an igneous rock that contains a group of dark-colored minerals, composed chiefly of magnesium and iron.
A rock with such properties.
noun
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Origin of mafic
ma(gnesium) Latin f(errum) iron –ic