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Dunite - Wikipedia, the free encyclopedia
Dunite (pronounced /ˈduːnaɪt/ or ) is an igneous, plutonic rock, of ultramafic composition, with coarse-grained or phaneritic texture. The mineral assemblage is greater than 90% olivine, with m...
en.wikipedia.org/wiki/Dunite |
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Dunite is a plutonic rock consisting of olivine. ... Dunite is a rare rock, a peridotite that is at least 90 percent olivine. It's named for Dun Mountain in New Zealand. This is a xenolith in an Arizona basalt...
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Dunite:; A rock made entirely of olivine. ... Peridotite has two varieties -- harzburgite (a rock that contains more olivine than pyroxene) and dunite (a rock consisting almost entirely of olivine). Peridotite typically displays a coarse crystalline texture and is both very dark and very dense.
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The chemical compositions of?the varieties of dunite rock are shown in Table i. All ... On the derivatogram of the dunite-serpentinite rock (Fig. ...
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Microscopic detail of dunite rock. The large, colourful crystals are of the minerals olivine and pyroxene. Image long dimension: 5.0mm. Polarised photomicrograph by N Mortimer, GNS Science. ... Home > Pounamu - An iconic stone > Geological origins of pounamu > Formation of pounamu > Microscopic detail of dunite rock.
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THE American Museum of Natural History has received from Kentucky interesting specimens of green rock, known as dunite, which, occurring in conjunction with carbon bearing strata, carboniferous sandstones, and shales in portions of Eillott County, that State, has given rise to the suggestion that Kentucky may...
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Science question: Is dunite or olivine a common rock? Dunite is not a common rock but olivine is. ... Dunite is not a common rock but olivine is.
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THE VIRTUAL ROCK BAG ... Now, for the first time, examples of the mineral and rock specimens are being made available as digital images on the World-Wide Web. NOTE: These images are intended to serve as a SUPPLEMENT to your learning and not ... REMARKS: this specimen is actually a rock called Dunite, composed mostly of olivine.
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To Olivine #2; Return to B.R.S.; A ferro-magnesian mineral. Light green, glassy, often granular, as is this specimen, no cleavage. Constructed of isolated silica tetrahedra held together ionically by iron ... Large accumulations such as this form the igneous rock dunite, or when mixed with pyroxene, peridotite.
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The peridotites in the Oman ophiolite are not in equilibrium with the MORB but the Oman dunites are, indicating that the dunites act as transports for the melt. ... The melt/rock reaction, in which ascending magma and mantle wall rock generate dunite, harzburgite and pyroxene-abundant lherzolite is the preferable model...
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