maf·ic

[maf-ik]
adjective Geology.
of or pertaining to rocks rich in dark, ferromagnesian minerals. Compare basic ( def 4 ), ultramafic.

Origin:
1910–15; ma(gnesium) + Latin f(errum) iron + -ic

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Science Dictionary
mafic   (māf'ĭk)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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00:10
Mafic is always a great word to know.
So is callithumpian. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences
The mafic inclusions are composed of the same minerals as the enclosing
  granitic rock, but in different proportions.
The dark, or mafic, minerals are richer in iron and magnesium.
Permeability is slow in mafic rocks because the dark minerals commonly weather
  to clay.
Mafic rocks are darker colored and are mostly made up of magnesium and iron.
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