mafic

[maf-ik]

adjective Geology.

of or relating to rocks rich in dark, ferromagnesian minerals.Compare basic(def 4), ultramafic.

Origin of mafic

1910–15; ma(gnesium) + Latin f(errum) iron + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

mafic in Science

mafic

[măfĭk]

Relating to an igneous rock that contains a group of dark-colored minerals, composed chiefly of magnesium and iron. Compare felsic.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.