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mafic

[maf-ik]
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adjective Geology.
  1. 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. 2018
mafic in Science

mafic

[măfĭk]
  1. Relating to an igneous rock that contains a group of dark-colored minerals, composed chiefly of magnesium and iron. Compare felsic.
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