La dernière modification de cette page a été faite le 30 septembre 2014 à 23:06. an ultrabasic igneous rock consisting mainly of olivine. GRAMMAR . Le nom de la roche vient de celui d'une montagne de Nouvelle-Zélande de la région de Nelson, Dun mountain, ainsi nommée à cause de la couleur gris-brun de sa végétation qui révèle la présence sous-jacente de roches ultramafiques. the feldspars . Dunite ( / ˈ d ʌ n aɪ t / or / ˈ dj uː n aɪ t /) is an igneous, plutonic rock, of ultramafic composition, with coarse-grained or phaneritic texture. Word in 6 letters. Etymologies. In this section, we will learn more about properties of Dunite i.e. Dunites are widespread; they usually form sills, parallel lenses, and intersecting pipes; more seldom they form large intrusive bodies (for example, the dunite belts along the entire Urals and the Mugodzhary). Know all about Dunite, What is Dunite, its composition, features, facts and reserves in next sections. Dunite is translucent to opaque in nature. Copyright © HarperCollins Publishers. See more. It can be formed in two ways. The mineral assemblage is greater than 90% olivine, with minor amounts of other minerals such as pyroxene, chromite, magnetite, and pyrope. Dunite is an igneous plutonic rock of ultramafic composition with coarse-grained granular or phaneritic texture and often massive or layered. What does dunite mean? Magnesium rich olivine forms a large part of the peridotite and therefore has a high magnesium content. Dunite definition gives information about the Formation of Dunite and its composition.The composition of Dunite can be further divided into mineral and compound content. Dunite is a green to brownish coarse-grained igneous rock mainly consisting of olivine, As Building Stone, As Facing Stone, Garden Decoration, Paving Stone, As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar, Artifacts, Monuments, Sculpture, Small Figurines, Constitutes upper part of the Earth's mantle, Generally rough to touch, Host rock for Diamond, Is one of the oldest rock. 0 | 0 | * The following sentence examples have been gathered from multiple sources to keep up with the current times, none of them represent the opinions of Word Game Dictionary It is dark Grey to Olive Green in colour. physical and thermal properties. The mineral assemblage is greater than 90% olivine, with minor amounts of other minerals such as pyroxene, chromite and pyrope.Dunite is the olivine-rich end-member of the peridotite group of mantle-derived rocks. quartz. from The American Heritage® Dictionary of the English Language, 4th Edition [After Mount Dun , in northern South Island, New Zealand.] The mineral content of Dunite rock includes Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene and The compound content of Dunite rock includes Ca, CaO, Fe, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide. : a granular igneous rock consisting chiefly of olivine. Know all about Dunite rock … Rock''s est la gamme célèbre pour ses chemises aux couleurs vives, lumineuses et éclatantes. C'est le membre supérieur riche en olivine de la série des péridotites, roches constituant le manteau. A treatise on rocks, rock-weathering and soils;. The mineral content of Dunite rock includes Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene and The compound content of Dunite rock includes Ca, CaO, Fe, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide. Depending upon Dunite Texture, it is divided into types. The strength of Dunite is 107.55 N/mm2. What is the last mineral to form on the left branch of Bowen's reaction series? noun mineralogy A type of igneous rock with a coarse-grained or phaneritic texture. Physical properties of Dunite include Color, Streak, Hardness, Structure, Cleavage, Fracture, Luster, Specific Gravity etc. See more ideas about igneous, igneous rock, rock. ultramafic. The total reserves available will be approximately. What is Dunite composed of? C peridotite and dunite the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes. Dunite definition, a coarse-grained igneous rock composed almost entirely of olivine. Streak of Dunite is white while its cleavage is imperfect. From: Introduction … Petrology; Soils. Rock types are specific assemblages of minerals (most rocks are composed of minerals). Microdiorite and other rock types the moment dunite PM is an important rock type it. In this section, we will discuss about Dunite types and facts. Dunite is an ultramafic plutonic rock that is composed almost exclusively of olivine. A dunite is an ultrabasic igneous rock dominated by essential olivine (>90% volume), often with accessory clinopyroxene, orthopyroxene, spinel, ilmenite, and magnetite. La dunite est une roche ignée, plutonique ultramafique, de structure grenue ou phanéritique. Examples. 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. THE PEEIBOTITES 91. Dunite ( /ˈdʌnaɪt/ or /ˈdjuːnaɪt/) (also known as olivinite, not to be confused with the mineral olivenite) is an igneous, plutonic rock, of ultramafic composition, with coarse-grained or phaneritic texture. La dunite est une roche ignée, plutonique ultramafique, de structure grenue ou phanéritique Feb 2, 2017 - List of all Igneous, Sedimentary, and Metamorphic Rock Types with Pictures and Links to Specific Articles about each Type of Rock. Almost all rocks undergo transformation process. Rocks are much more vaguely defined than minerals. … Rock type is usually defined as a particular kind of rock having a specific set of characteristics1. The types of Dunite rock are not available. What is Dunite? Most common mafic minerals in ultramafic rocks are definitely pyroxenes and olivine (if hornblende is present it is added to pyroxenes). The country rock is limestone. GRAMMAR A-Z ; SPELLING ; PUNCTUATION ; WRITING TIPS ; USAGE ; EXPLORE . https://fr.wikipedia.org/w/index.php?title=Dunite&oldid=107870565, Catégorie Commons avec lien local identique sur Wikidata, Portail:Sciences de la Terre et de l'Univers/Articles liés, licence Creative Commons attribution, partage dans les mêmes conditions, comment citer les auteurs et mentionner la licence. Garnet pyrope is quite common as well probably very common in the mantle olivine. Peridotite and dunite have _____ compositions. (ˈdʌnaɪt ) noun. The peridotite and therefore has a high magnesium content type of peridotite is! If these rocks formed as a result of the meteorite impact, the limestone remains are the yellow parts of the rock. What is an example of an igneous ore deposit? Dunite. Meaning of dunite. La dunite est soumise à un processus de rétrométamorphisme près de la surface et se transforme alors en serpentinite. Dunite, the parent rock of Magnesite contains 49% of MgO and 39% of SiO2 and the Magnesite is derived from the Dunite. Definition of dunite in the Definitions.net dictionary. Olivine is a magnesium orthosilicate containing an amount of iron having a variable formula (Mg, Fe) 2 SiO 4; pyroxenes are chain silicates having variable formulas (Ca, Na, FeII, Mg) (Cr, Al, FeIII, Mg, Mn, Ti, V) Si2O6 containing a large number of different minerals. (noun) “Ultramafic” means that mafic minerals form more than 90% on the rocks composition. What branch of Bowen's reaction series cools with a continuous change in composition? Dunite is linked by gradual transitions with several gabbros and pyroxenites. La dunite se présente rarement à l'intérieur des roches continentales, mais lorsque c'est le cas, elle se trouve de façon caractéristique à la base de séquences d'ophiolites, là où des morceaux du manteau rocheux provenant d'une zone de subduction ont été plongés dans la croûte continentale par obduction en raison d'une collision continentale ou en présence d'un arc volcanique. Dunite is a plutonic ultramafic igneous rock consisting almost m olivine. Most common mafic minerals in ultramafic rocks are definitely pyroxenes and olivine (if hornblende is present it is added to pyroxenes). Dunite Définition Classé sous : Géologie Roche ultrabasique contenant 90% ou plus d' olivine avec un peu de pyroxène, spinelle (chromite) et parfois d'amphibole, de biotite et de grenat. Even rocks within one rock type may have a highly variable composition. Un article de Wikipédia, l'encyclopédie libre. Dunite is an ultramafic plutonic rock that is composed almost exclusively of olivine. “Ultramafic” means that mafic minerals form more than 90% on the rocks composition. How do you use dunite in a sentence? Almost all rocks undergo transformation process. selon les recommandations du projet minéraux et roches. Definition of dunite. C peridotite and dunite the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes. Peridotite (Dunite) Peridotite is a very dense, coarse-grained, olivine-rich, ultra- mafic intrusive rock. Vous pouvez partager vos connaissances en l’améliorant (comment ?) The layered magmatic complexes have much more diverse compositions depending on the fractions of pyroxenes, chromite, plagioclase and amphib… Dunite definition gives information about the Formation of Dunite and its composition.The composition of Dunite can be further divided into mineral and compound content. Here, you will get to know about Dunite types, interesting facts, features of Dunite, its monuments and fossils. What does dunite mean? Know all about Dunite rock in next section. De façon caractéristique, la dunite contient plus de 90 % d'olivine et de petites quantités de pyroxène et de chromite. metal-rich quartz veins. Dunite, light yellowish green, intrusive igneous ultramafic rock that is composed almost entirely of olivine. A type of igneous rock with a coarse-grained or phaneritic texture. WORD ORIGINS ; LANGUAGE QUESTIONS ; WORD LISTS; SPANISH DICTIONARY; More. Different sizes are manufactured based on Customer requirements. Dunite is usually coarse- to medium grained and is a peridotite. Collins English Dictionary. Always contain little brucite, spinel-chromite, magnetite, dunite is mostly of! What are synonyms for dunite? The main purpose of this paper is to propose a quantitative model of dunite formation based on a detailed petrologic study of the Iwanaidake peridotite. In the dunite it is as a rule even crystalline granular, none of the olivines showing perfect crystal outlines. Get to know about composition of Dunite here. Un gisement à ciel ouvert de dunite existe dans l'État de Washington (États-Unis), près du mont Baker. A dense igneous rock that consists mainly of olivine and is a source of magnesium. Amphibole, Chromite, Garnet, Magnesium, Olivine, Phlogopite, Plagioclase, Pyroxene, Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Coastal Erosion, Glacier Erosion, Water Erosion, Heat Resistant, Pressure Resistant, Wear Resistant, China, India, Indonesia, Kazakhstan, Russia, South Korea, Thailand, Turkey, Finland, France, Georgia, Germany, Great Britain, Italy, Kazakhstan, Netherlands, Norway, Spain, Switzerland, Venezuela, Argentina, Brazil, Colombia, Ecuador, Venezuela, From the name of Dun Mountain, New Zealand, + -ite1, Decorative Aggregates, Interior Decoration, Creating Artwork, Gemstone, Jewelry, Source of Chromite, Platinum, Nickel and Garnet, Source of Diamonds, Ca, CaO, Fe, Potassium, Silicon Dioxide, Sodium, Titanium Dioxide, Biological Weathering, Chemical Weathering, Mechanical Weathering. Types of Dunite. Definition of dunite. Avec Rock''s, vos chemises se distinguent et votre classement couleur devient facile à repérer pour une meilleure organisation de vos dossiers.La carte est noble, rigide et résistante, elle est certifiée PEFC®, issue de forêts gérées durablement. — The structure as displayed in the different varie- ties is somewhat variable. dunite in British English. This definition of the word dunite is from the Wiktionary, where you can also find the etimology, other senses, synonyms, antonyms and examples. Do you know the meaning of dunite? Peridotites are economically important rocks because they often contain chromite - the only ore of chromium; they can be source rocks for diamonds; and, they have the potential to be used as a material for sequestering carbon dioxide. Il lui a été donné par le géologue autrichien Ferdinand von Hochstetter en 1859. Almost all rocks are divided into types. GRAMMAR A-Z ; SPELLING ; PUNCTUATION ; WRITING TIPS ; USAGE ; EXPLORE . ENGLISH DICTIONARY; SYNONYMS; TRANSLATE; GRAMMAR . . Dunite usually forms sills (tabular bodies intruded between other rocks) but may also occur as lenses (thin-edged strata) or pipes (funnels, more or less oval in cross section, that become narrower with increasing depth). Oct 23, 2018 - Explore Great Diamond Press LLC's board "Hidden Gems - Dunite" on Pinterest. Much of Earth's mantle is believed to be composed of peridotite. Structure. Information and translations of dunite in the most comprehensive dictionary definitions resource on … It is noted for its low silica content, and contains very little or no feldspar ( orthoclase, plagioclase).It is a common component of oceanic lithosphere, and is derived from the upper mantle. Luster of Dunite is shiny and its fracture is irregular. 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