dunite

dunite
/dooh"nuyt, dun"uyt/, n.
a coarse-grained igneous rock composed almost entirely of olivine.
[1865-70; named after Mt. Dun in New Zealand, where it is found; see -ITE1]

* * *

Yellowish green to green igneous rock composed almost entirely of olivine.

Chromite and magnetite also occur in dunite, as do spinel, ilmenite, pyrrhotite, and platinum in some cases. Dunites may be a source of chromium. Places of occurrence include Dun Mtn., New Zealand (the source of its name), South Africa, and Sweden.

* * *

 light yellowish green, intrusive igneous ultramafic rock that is composed almost entirely of olivine. Dunite usually forms sills (tabular bodies intruded between other rocks) but may also occur as lenses (thin-edged strata) or pipes (funnels, more or less oval in cross section, that become narrower with increasing depth). It is a common rock in Earth's upper mantle. Occurrences include Dun Mountain, New Zealand, from which the rock takes its name; the Bushveld Igneous Complex, South Africa; and Frostviken, Jämtland, Sweden. Chromite, picotite, and magnetite also occur in dunite, as do spinel, ilmenite, pyrrhotite, and platinum in some cases. Dunites constitute an important source of chromium, a commercially valuable metal.

* * *


Universalium. 2010.

Look at other dictionaries:

  • dunite — ● dunite nom féminin (de Dun Mountains, nom propre) Péridotite contenant plus de 90 % d olivine …   Encyclopédie Universelle

  • dunite — [dun′īt΄, do͞on′īt΄] n. [after Mt. Dun, in New Zealand + ITE1] a dense, intrusive igneous rock consisting largely of olivine …   English World dictionary

  • Dunite — Not to be confused with Dunnite. Small volcanic bomb of (black) basanite with (green) dunite Dunite (   …   Wikipedia

  • Dunite — La dunite est une roche ignée, plutonique ultramafique, de structure grenue ou phanéritique. Sommaire 1 Minéraux 2 Gisements 3 Métamorphisme 4 Histoire …   Wikipédia en Français

  • dunite — dunitas statusas T sritis chemija apibrėžtis Ultrabazinė magminė intruzinė uoliena iš olivino su kitų mineralų (magnetito, chromito, kartais platinos) priemaišomis. atitikmenys: angl. dunite rus. дунит …   Chemijos terminų aiškinamasis žodynas

  • dunite — noun Etymology: Mt. Dun, New Zealand Date: circa 1868 a granular igneous rock consisting chiefly of olivine • dunitic adjective …   New Collegiate Dictionary

  • dunite — noun /ˈduːnaɪt/ A type of igneous rock with a coarse grained or phaneritic texture …   Wiktionary

  • dunite — n. yellowish green coarse grained igneous rock composed of olivine …   English contemporary dictionary

  • dunite — [ dʌnʌɪt] noun Geology a green to brownish coarse grained igneous rock consisting largely of olivine. Origin C19: from the name of Dun Mountain, New Zealand, + ite1 …   English new terms dictionary

  • dunite — du·nite …   English syllables

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”