Main Page | See live article | Alphabetical index Dunite is an igneous, plutonic (intrusive) rock, of ultramafic composition, with phaneritic texture. Mineral assembly is composed typically of > 90% olivine. Dunitic rocks are believed to represent the Earth's mantle. Typically, dunites occur at the base of ophiolite sequences. See also: igneous rocks, list of rocks This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.