Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle. Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine. The streak of Dunite and Peridotite is white. They are further divided into subtypes. Dunite: a peridotite that is composed mainly of olivine and may contain significant amounts of chromite, pyroxene, and spinel. The composition of Dunite and Peridotite consists of mineral content and compound content. Nickel and platinum are usually associated with ultramafic host rocks. “Ultramafic” means that mafic minerals form more than 90% on the rocks composition. ‘Plutonic’ means that the rock is not volcanic, it didn’t form at or near the surface. Width of sample 9 cm. Le Maitre, R. W. (2005). Learn more about Peridotite vs Dunite in the next section. (, Ishii, T., Robinson, P. T., Maekawa, H. & Fiske, R. (, Ishizuka, H., Imaizumi, M., Gouchi, N. & Banno, S. (, Ito, M., Yurimoto, H., Morioka, M. & Nagasawa, H. (, Kelemen, P. B., Shimizu, N. & Salters, V. J. M. (, Kinzler, R. J., Grove, T. L. & Recca, S. I. It is an important rock type because the Earth’s mantle is predominantly composed of it. It can be formed in two ways. It is an important rock type because the Earth’s mantle is predominantly composed of it. Cumulative dunite is formed by fractionation of olivine from a mafic melt. The process of formation of rocks is different for various rocks. It is an ultramafic rock (mafic minerals make up more than 90% of the rocks composition). Dunite xenolith in basaltic lava from Hawaii. Also you can check about Properties of Peridotite and Properties of Dunite. You can also know more about Dunite and Peridotite Reserves. The interior uses of Peridotite include Decorative aggregates and Interior decoration whereas the interior uses of Dunite include Decorative aggregates and Interior decoration. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. We would like to thank the following for the use of this sample: Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence. Serpentinite sample from the Troodos ophiolite. Though some rocks look identical, they have certain characteristics which distinguish them from others. Rocks are quarried from many years for various purposes. A sample from the Troodos ophiolite in Cyprus with a weathering rinds. The values of exchange partition coefficients are modified to satisfy the chemical compositional relationships in the starting sample of HD2. Harzburgite is rich in olivine and orthopyroxene but there can be only up to 5% clinopyroxene. As two rocks are not same, it’s fun to compare them. Telephone: +81-3-5734-2338. The streak of Dunite and Peridotite is white. Please check your email address / username and password and try again. Replacive dunite is a product of the reaction between a pyroxene-bearing host rock and an olivine-saturated magma, which dissolves orthopyroxene in the host peridotite and sometimes crystallizes olivine. Width of sample 11 cm. The types of Dunite are Not Available whereas types of Peridotite are Dunite, Wehrlite, Harzburgite, Lherzolite and Pyrolite. This rock itself is usually not a notable mineral resource (see the exception from Norway below), but valuable stuff may be associated with it. I have collected them from Troodos as well as 3 km from Limassol beach , they are different in that the Troodos ones are layered and the Limassol ones are more large grained crystal & what i thought is called Pyroxenite or hornblendite … i can’t tell . It is difficult to tell pyroxenite and hornblendite apart. As two rocks are not same, it’s fun to compare them. Needs some hiking to the mountains. Note that neither peridotite nor pyroxenite are single rock types. ; Harzburgite: mostly composed of olivine plus orthopyroxene, and relatively low proportions of basaltic ingredients (because garnet and clinopyroxene are minor). Unaltered rock is in the middle. Peridotite is a rock type that is more representative of Earths mantle than of the crust. This is example of a depleted mantle. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Basalt and peridotite differ in composition because rocks are mixtures of minerals, but each mineral has its own melting temperature. The rocks that are called peridotites are therefore often heavily metamorphosed and should be called serpentinite instead of peridotite which it once was. The process of formation of rocks is different for various rocks. Cambridge University Press. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. Note that neither peridotite nor pyroxenite are single rock types. The mineral content of Dunite includes Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene and mineral content of Peridotite includes Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene. Peridotite is a plutonic rock, it is mostly composed of visible mineral grains. Harzburgite from the Troodos ophiolite. A rock type with less olivine is named pyroxenite (or hornblendite if there are more amphiboles than pyroxenes). Thanks are also due to Mr Hideto Yoshida for his assistance with EPMA analysis. Fresh dunite is used in parts of glass furnaces. Peridotite (Dunite) Peridotite is a very dense, coarse-grained, olivine-rich, ultra- mafic intrusive rock. The main components of this rock, olivine and pyroxene, are unstable minerals in the weathering environment. Rest of the rock that did not melt have also different composition from the source rock, it is enriched in minerals with a higher melting temperature. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc.

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