Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A dense igneous rock that consists mainly of olivine and is a source of magnesium.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A type of igneous rock with a coarse-grained or phaneritic texture.

from The Century Dictionary and Cyclopedia

  • n. A rock consisting essentially of a crystalline granular mass of olivin with chromite or picotite, containing also frequently more or less of various other minerals, alteration products of the olivin. Dunite appears to be frequently more or less altered into serpentine.

Etymologies

After Mount Dun in northern South Island, New Zealand.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • C peridotite and dunite the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes.

    Earth Robot | SciFi, Fantasy & Horror Collectibles

  • The Ural Mountain deposits of Russia are gold - and platinum-bearing placers, in streams which drain areas of dunite rock containing minute quantities of native platinum.

    The Economic Aspect of Geology

  • The zones are separated by a horizon of disseminated chromite hosted within peridotite and dunite.

    The Earth Times Online Newspaper

  • One shows how dunite terrain is desert even if well watered: a dunite massif in New Zealand adjoins another mountain, and at the joint, the other mountain is green, the dunite is orange.

    RealClimate

  • Bits of these rocks -- peridotite, dunite, lherzholite and others -- may be squeezed to the surface when continental plates collide with oceanic plates, or, less often, when the interiors of continents thin and develop rifts.

    Climate Ark Climate Change & Global Warming RSS Newsfeed

  • The process of mineral carbonation on ultramafic rocks such peridotite, dunite and lherzholite takes thousands of years for large quantities of carbon dioxide to be soaked up.

    EcoEarth.Info Environment RSS Newsfeed

  • Bits of these rocks-peridotite, dunite, lherzholite and others -- may be squeezed to the surface when continental plates collide with oceanic plates, or, less often, when the interiors of continents thin and develop rifts.

    Earth News, Earth Science, Energy Technology, Environment News

  • Chromite mineralization is hosted within a continuous northeast to southwest-trending ultramafic sill complex consisting of variably altered dunite, peridotite and pyroxenite.

    Marketwire - Breaking News Releases

  • C) peridotite and dunite (the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes.

    SciFi, Fantasy & Horror Collectibles - Part 604

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