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Relating to or containing a group of dark-colored silicate minerals, composed chiefly of magnesium and iron, that occur in igneous rocks, including hornblende, pyroxene, olivine, and biotite.

[ma(gnesium) + Latin f(errum), iron + -ic.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) a collective term for minerals present in igneous rock
(Geological Science) relating to igneous rocks or silicate minerals
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmæf ɪk)

of or pertaining to rocks rich in dark, ferromagnesian minerals.
[1910–15; ma(gnesium) + Latin f(errum) iron + -ic]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Results of both holes have again confirmed the close association between the mafic igneous unit and gold mineralisation at Sanankoro, the company said, as well as the typical vertical dip of the geological units.
Alt's recent ten hole RC program reported here has confirmed the historical results intercepting broad zones of low-level gold in a series of ultramafic and mafic schists with sulphidic shales and cherts.
Several new surface sampling programs have been completed, with work targeting both potential Primrose Shear related gold occurrences as well as potential nickel-cobalt targets in the southern mafic suite areas.
He said the project entailed assessment of Mafic, Ultramafic and Granitic Complexes.
The property geology contains the contact between Confederation and Balmer Assemblage rock units as well as folded mafic and ultramafic volcanics with mafic and felsic intrusives also present.
The intrinsic characteristics including textures, mineralogy and degree of weathering of the mafic and ultramafic rocks of the Jijal complex are investigated and correlated with their respective physical, mechanical and aggregate properties.
Subsequently, albitisation transformed scapolite metagabbro and regionally distributed mafic and granitoid rocks to albitites, dominated by albite, with varying amounts of rutile, carbonate, chlorite, and locally prehnite, pumpellyite, and analcime.
They make it possible to apply magnetic and spectrometric geophysical methods as mafic and ultramafic igneous and metamorphic rocks normally contain the greatest quantity of magnetic minerals (high magnetic susceptibilities) and the least abundance of radiometric minerals.
Fox and van Berkel (1988) speculated that some ultramafic enclaves represent relics of the Long Range mafic-ultramafic complex and/or Glover Group, whereas Currie and van Berkel (1989) suggested that some mafic bodies represent Silurian plutons, similar to intrusions previously recognized near the Annieopsquotch ophiolite (e.g., Dunning 1981; Dunning et al 1990) and Grand Lake (Whalen et al.
To the immediate east of Island on their Bellevue property, they have followed a large magnetic anomaly suggesting the potential for a mafic intrusion below surface, very similar to the nickel-copper deposits in Sudbury.