Dunite (t or t) (aka olivinite, not to be confused with the mineral olivenite) is an igneous, plutonic rock, of ultramafic composition, with coarse-grained or phaneritic texture. The mineral assemblage is greater than 90% olivine, with minor amounts of other minerals such as pyroxene, chromite, magnetite, and pyrope. Dunite is the olivine-rich end...
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http://en.wikipedia.org/wiki/Dunite
light yellowish green, intrusive igneous ultramafic rock that is composed almost entirely of olivine. Dunite usually forms sills (tabular bodies ... [1 related articles]
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http://www.britannica.com/eb/a-z/d/82
a coarse-grained igneous rock composed almost entirely of olivine.
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https://www.infoplease.com/dictionary/dunite
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