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Dunite is not a common rock but olivine is.
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∙ 14y ago
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Why dunite has no volcanic equivalent?
Dunite is composed predominantly of olivine. A volcanic rock of dunite composition would need to form from a lava/magma of dunnite composition. A magma of dunite i.e. olivine composition would never be produced from melting of mantle or crustal rocks because olivine melts/crystallises at higher temperatures than most other minerals. Therefore, melting any rock other than dunite itself would produce a magma with a composition less Fe-Mg-rich than dunnite. Dunite forms in 2 ways: When olivine is concentrated by accumulation at the base of a magma chamber (cumulate layaered gabbro); and by chemical reaction between an exsolved basaltic melt and residual peridotite in the lithospheric mantle. Pyroxene in the mantle dissolves and olivine is left behind as a residual material.
Which pair of rocks could only be composed of only one mineral.?
dunite and rock salt. dunite only compose of only olivine and rock salt contain only halite (earth science reference table)
What type of rock is monomineralic?
rocks made up of only one mineral are called monomineralic rocks like dunite(olivine), quartzite(quartz) etc.
What type of rock is mostly found in mantle?
The rocks found in the mantle are usually olivine, pyroxenes, spinal structure minerals, and garnet. Some others are peridotite, dunite, and eclogite.
Is dunite a rock or mineral?
Duntie is a rock
A type of rock that is composed of only one mineral?
Limestonedunitequartziteand some others
Which types of igneous rocks are composed of at least 50 percent olivine?
There are three intrusive igneous rocks that are composed of at least 50% olivine. These rocks are peridotite, kimberlite and dunite.
Is dunite an intrusive or extrusive igneous rock?
intrusive
What are rocks that come from the mantle?
Rocks of the mantle are peridotite, dunite, and eclogite. In deeper regions, the olivine may be replaced by more stable minerals.
What rock will you find in the Mantle?
The mantle, or interior of the Earth is made up of mostly of rocks that have high amounts of silicon and aluminum. There is also an abundance of nickel and iron in the mantle.
Does olivine rock form to become soil?
Sand is formed from the breakdown of rocks. If a rock contains large amounts of olivine, then when this rock weathers, olivine sand will be formed. There are beaches in New Zealand that are almost exclusively made of green olivine crystals.
What is an example of a mafic rock?
Mafic rock is an example of igneous rock which is dominated by olivine, silicates pyroxene, mica, and amphibole. Common mafic rock samples are basalt and gabbro.
