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 (do͞o′nīt′, dŭn′īt′)
A dense igneous rock that consists mainly of olivine and is a source of magnesium.

[After Mount Dun in northern South Island, New Zealand.]

du·nit′ic (do͞o-nĭt′īk, də-) adj.
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) an ultrabasic igneous rock consisting mainly of olivine
[C19: named after Dun Mountain, a mountain in New Zealand where it is abundant]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈdu naɪt, ˈdʌn aɪt)

a coarse-grained igneous rock composed almost entirely of olivine.
[1865–70; after Mt. Dun in New Zealand]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
The poor geotechnical properties of Dunite residual soil and heavy antecedent rainfall were the main causes of the landslide.
'Our calculations show that enhanced weathering could be competitive already at $60 per ton of CO2 removed for dunite, but only at $200 per ton of CO2 removed for basalt,' Strefler said.
Presently, more than 51 metallic and non metallic minerals have been discovered in Balochistan out of which 29 are being exploited including minerals such as chromite, copper, iron, lead, zinc, manganese, antimony and gold etc whereas the non-metallic include barite, fluorite, calcite, magnesite, granite, coal and dimension stone such as marble both onyx and ordinary, granite, gabbro basalt and dunite etc.
Nickel deposits in the country are predominantly associated with laterite ores (limonite being a member of the laterite family), but are also found in dunite, pyroxenite and gabbroic rocks as stated by the Philippines' Mines and Geosciences Bureau.
In addition to magnesite, dunite, one of the host rocks of mineralization, is also being mined.
Large gem-quality forsterite (peridot) crystals appear to grow from hydrous fluids along tension gashes in igneous dunite bodies.
###Chromite###Chromite bearing Dunite (ultramafic###Amphibolite###(Chromite
The peridotite unit rocks are the most altered part of Noorabad ophiolite including dunite, harzburgite and lherzolite.
In addition, two significant intersections of copper were reported in FKD13_441 at Owendale North including 9m @ 0.92%Cu from 38m at the base of the laterite zone and 10m @ 2.1%Cu from 60m in fresh rock (visual native copper in dunite).
Upper mantle consist mostly of olivine, pyroxene, spinel-structure minerals, and garnet; [31] typical rock types are thought to be peridotite, dunite, and eclogite.
Maqsood, "Modeling of effective thermal conductivity of dunite rocks as a function of temperature," International Journal of Thermophysics, vol.