Origin of mafic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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.