mafic

(mafik)

adjective

Geol. 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

Origin: ma(gnesium) + L f(errum), iron + -ic

See mafic in American Heritage Dictionary 4

adjective
Containing or relating to a group of dark-colored minerals, composed chiefly of magnesium and iron, that occur in igneous rocks.

Origin:

Origin: ma(gnesium)

Origin: + Latin f(errum), iron

Origin: + -ic

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