Eclogite forms at pressures greater than those typical of the crust of the Earth. Streak is the color of rock when it is crushed or powdered. Home. Eclogite Gemstone - Read where is eclogite found, its healing properties, metaphysical properties, color, and facts right here at Gemexi. The fresh rock can be striking in appearance, with red to pink garnet (almandine-pyrope) in a green matrix of sodium-rich pyroxene (omphacite). Your email address will not be published. Argillite. Argillite. Rutile, kyanite, and quartz are typically present. Mantle‐derived, ultramafic rocks are rare in the Erzgebirge and restricted to the UHP unit. Formed under high pressure whilst two tectonic plates collided. Sample 7 Rock Description: This rock is Eclogite. Both must be present and neither component more than 75% vol. Formed under very high pressure, and initially containing about 50% garnet, together with omphacite pyroxene and quartz and zoisite (which shows anomalous blue interference colour in … The eclogites exposed along northeastern boundary of the Belomorian orogen in the eastern Fennoscandian Shield were formed as a result of Mesoarchean–Neoarchean subduction … This type of metamorphism occurs beneath slowly subsiding sedimentary basins and also in the descending oceanic plate in some subduction zones . The assemblage is typical of what is formed in conditions corresponding to an area on the two dimensional graph of temperature vs. pressure (See diagram in Figure 1). Eclogite  Rock: Eclogite ( /ˈɛklədʒaɪt/) is a mafic metamorphic rock. Eclogites are helpful in elucidating patterns and processes of plate tectonics because many represent oceanic crust that has been subducted to depths in excess of 35 km and then returned to the surface. Quartz, magnetite, and calcite can also be present in small amo… It is common in the upper mantle, especially in regions occupied by subducted oceanic plates. In some retrogressed eclogites and accompanying more silica-rich rocks, UHP (ultrahigh-pressure) metamorphism has been recognized only because of the preservation of coesite and/or diamond inclusions within trace minerals such as zircon and titanite. Peridotite is ultramafic, as the rock contains less than 45% silica. Eclogite facies is determined by the temperatures and pressures required to metamorphose basaltic rocks to an eclogite assemblage. Rutile. Luster of Eclogite is the interaction of light with the surface of Eclogite. Comendite. Norway. More detailed description of our start HD material : Eclogite. Publisher Description In this third book of The Radon Trilogy, Radon Schneider, geologist, finds an exotic red and green rock in Monument Valley, a part of the Navajo Nation. Quartz, feldspar, etc, may also be present. A metamorphic facies is a set of mineral assemblages in metamorphic rocks formed under similar pressures and temperatures. garnet (often pyrope or Mg-rich almandine) and omphacite (Na-Ca-Al-Mg clinopyroxene). ... collection of gemstones with descriptions Kyanite eclogite. The foliation is … Nordfjord, Western Norway. Some regard the eclogite boulders as derived from deep-seated crystalline rocks, others as concretions in the blue ground. Blueschist Blueschist is a regional metamorphic rock formed under high-pressure (HP) low-temperature (LT) conditions. Plagioclase is not stable in eclogite. Description: This coarse-grained eclogite comes from Glenelg, Inverness-shire in Scotland.The thin section contains garnet, clinopyroxene (omphacite), minor quartz, rutile and opaques and secondary hornblende and plagioclase along garnet and pyroxene grain boundaries. The former can take place when a rock is buried or uplifted at a rate that permits it to maintain thermal equilibrium with its surroundings. Eclogite: A high P/T metamorphic rock composed of more than 75% vol. Both must be present and neither component more than 75% vol. Top products from Egypt and Brazil MONTAUK, Detail information on the Shoshonite rock, Anticatto Stone Finishing Detail Information. Aside from being an absolutely gorgeous rock, eclogite is intriguing because it provides direct evidence that basalt and gabbro descend deep within the Earth. Eclogite is a very interesting rock. Eclogite never contains plagioclase. Eclogite (Ecclogite) Metamorphic Rock Source: Australia Eclogite can be striking in appearance, with red to pink garnet (almandine-pyrope) in a green matrix of sodium-rich pyroxene (omphacite). noun a rare coarse-grained basic rock consisting principally of garnet and pyroxene. ESS212: Rock Descriptions General Outline for Rock Descriptions of hand samples Any rock description should present in a complete, objective and concise fashion all pertinent observations so that someone reading it will have a clear picture of what that particular rock looks like. The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. 24 Norway, Western Gneiss Complex Coarse-grained eclogite with garnet, pale green omphacite, minor quartz and rutile. Eclogite is a metamorphic rock containing granular minerals, typically garnet and pyroxene. Diamond and coesite occur as trace constituents in some eclogites and record particularly high pressures. The pale green pyroxene and red garnet are diagnostic of this rock. The characteristics related to grain size are known as a rock's texture—coarse-grained, fine-grained, and glassy are all descriptions of a rock… Eclogite with omphacite (green), garnet (red) and quartz (white). Green amphibole and pyroxene-feldspar symplectite formed at omphacite grain boundaries during exhumation. Eclogite cleavage is perfect. This was a UHP eclogite and coesite relics occur elsewhere in this section as inclusions in garnet and omphacite. Because of its high density large amounts of the eclogite formed are expected never to return to the earth’s surface. Depending upon Eclogite Texture, it is divided into types. Collins English Dictionary. This sample has alternating bands … Get to know information about Eclogite texture and also know all about Eclogite Color. Your description of the rocks probably included their color and surface shape, plus characteristics such as size, shape, and arrangement of the grains or crystals in each rock. Lawsonite eclogite is known from the U.S. (Franciscan Complex of California; xenoliths in Arizona); Guatemala (Motagua fault zone), Corsica, Australia, the Dominican Republic, Canada (British Columbia), and Turkey. Eclogite balances yin yang, male-female, and personal partner energies, stabilizing and protecting. Eclogites in granulite terranes are known from the Musgrave Block of central Australia where a continental collision took place at 550-530 Ma, resulting in burial of rocks to >45 km (15 kilobars) and rapid (in less than 10 million years! From Virtual microscope. Hydrothermally altered eclogite (Aosta Valley, Italy, Zermatt Saas Unit) With garnet, chloritoid (black), talc (whitish). Conditions of the prograde, peak‐pressure and part of the decompressional P–T path of two Precambrian eclogites in the eastern Sveconorwegian orogen have been determined using the pseudosection approach. Description more details. Formed under very high pressure, and containing about 50% garnet, together with pyroxene and quartz. eclogite-obtained through the kindness of Mr. Diller--which very much resemble some facies of the glaucophane eclogite of Tiburon. Eclogite is a metamorphic rock consisting of pyroxene omphacite and pyrope-rich garnet. This rock sample belongs to a fossilized hydrothermal system. This is the rock name to remember when you find a hard, nondescript rock that looks like it … Durable Rocks … ‘Specific rock names that record both the parent rock and its mineralogy are relatively rare, but include eclogite, blueschist, and amphibolite.’ Formed under high pressure whilst two tectonic plates collided. The foliation is … Eclogite never contains plagioclase. It is a rare but geologically significant rock type. subduction is the formation of eclogite. From Sand atlas. Age 420 million years. Eclogite is a very dense rock formed at high pressures by metamorphism of basaltic and gabbroic rocks. This is high-pressure, medium- to high-temperature metamorphism. Eclogite is the highest pressure metamorphic facies and is usually the result of advancement from blueschist metamorphic conditions. See more ideas about Rocks and minerals, Geology, Metamorphic rocks. Discovery and brief history of eclogites Aside from being an absolutely gorgeous rock, eclogite is intriguing because it provides direct evidence that basalt and gabbro descend deep within the Earth. Locally, however, eclogite and associated high-pressure rocks are found in metamorphic Eclogite facies rocks are usually associated with blueschist facies rocks and can form when oceanic crust is subducted to great depths before being returned to the surface. It is sometimes called "Christmas Rock" because of its bright green, red and white minerals. Eclogite vs Granite. 5 mm) foliated eclogite comprising omphacite (∼70%), garnet (∼25%), rutile (2%) and accessory apatite, pyrite and blue amphibole. An unusually dense rock, eclogite can play an important role in driving convection within the solid Earth. a rare coarse-grained basic rock consisting principally of garnet and pyroxene. Amphibolite is a widely used term for rock composed of mostly black amphibole and plagioclase, blueschist for blue to blue-green rocks containing blue (Na) amphibole, and eclogite for rocks containing grass- green pyroxene (omphacite) and red, Mg-rich garnet. The specific gravity of Eclogite is 2.86-2.87. Accessory minerals include kyanite, rutile, quartz, lawsonite, coesite, amphibole, phengite, paragonite, zoisite, dolomite, corundum, and, rarely, diamond. Eclogite GR 30c is a massive medium-grained rock, consisting of garnet, omphacite, glaucophane, epidote, phengite, apatite, quartz, and rutile. It is thought to originate by metamorphism or igneous crystallization at extremely high pressure. Details. Basaltic Trachyandesite. Description: This coarse-grained eclogite comes from Glenelg, Inverness-shire in Scotland.The thin section contains garnet, clinopyroxene (omphacite), minor quartz, rutile and opaques and secondary hornblende and plagioclase along garnet and pyroxene grain boundaries. Eclogite is a rock that typically forms from high pressure metamorphism of mafic igneous rock at temperatures in excess of 500oC and pressures in excess of 12kbar. Second, being unusually dense rock, Eclogite can play an important role in driving convection within the solid Earth. The common metamorphic facies. Eclogite balances the energy flow throughout the body, from base to crown and can stimulate the […] Metamorphic Rocks + Schist. California. Eclogite is an uncommon rock. Eclogite, ek′loj-īt, n. a crystalline rock, composed of smaragdite and red garnet. The eclogite facies was initially recognized in rocks only of basaltic composition, which are transformed at the pressure-temperature conditions of the eclogite facies into spectacular red and green rocks composed of the anhydrous mineral assemblage garnet plus omphacite. Schneider unravels the mystery of its origin while he battles his mortal enemy, Spencer Barkdale, the … Eclogite is of special interest for at least two reasons. Cores of garnet from a Fe–Ti‐rich eclogite record a first prograde and syn‐deformational stage along a Barrovian gradient from ~670 °C and 7 kbar to 710 °C and 8.5 kbar. Eclogite Gemstone - Read where is eclogite found, its healing properties, metaphysical properties, color, and facts right here at Gemexi. The streak of Eclogite is white whereas its fracture is not available. Fossil Rocks + Novaculite. Metamorphic rock, any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components. Some UHP rocks appear to record burial at depths greater than 150 km. In the Newlands boulder the diamonds have the appearance of being an original constituent of the eclogite. Amphibolite is a coarse-grained metamorphic rock that is composed mainly of green, brown, or black amphibole minerals and plagioclase feldspar. garnet (often pyrope or Mg-rich almandine) and omphacite (Na-Ca-Al-Mg clinopyroxene). The garnet is rich in… He concludes that the rock might be termed a hornblende eclogite. Eclogite can also form from magmas that crystallize and cool within the mantle or lower crust. This is a garnet-peridotite or eclogite from the earth's mantle, containing pyrope, chromian diopside and forsterite (olivine). It is composed of interlocking grains of green pyroxene and garnet (the reddish dots). Garnet poikiloblasts occur as euhedral crystals, rich in inclusions such as titanite, epidote, apatite, and quartz. Basalt, diorite, eclogite, hornfels, lherzolite and peridotite xenoliths Kimberly (various mines), Bushveld Various xenoliths collected by George Harlow from several mines in 1998 and by Ed Mathez from the Bushveld intrusion in 2007. subheading of igneous rocks, describes a massive hornblende rock that appears to be a diorite and contains many small garnets with sphene, quartz, plagioclase, and zircon as probable accessories. Required fields are marked *. Eclogite typically results from high-pressure metamorphism of mafic igneous rock (typically basalt or gabbro) as it plunges into the mantle in a subduction zone. The glaucophane is a trifle darker blue, and the garnets do not show such definite crystal forms as do those in the California rock. Its fine texture and felsic components allow for good knapped pieces, much like working chert, producing conchoidal fracture It is formed in the subduction zone environment with low geothermal gradients (4-14°C km-1) and is characterized by the presence of HP/LT index minerals like glaucophane, lawsonite, aragonite, jadeite, and deerite (Fig.1). Description Superficial appearance of eclogite varies a lot, but what is diagnostic is the red garnet and pale green pyroxenes of eclogite. The typical eclogite mineral assemblage is garnet (pyrope to almandine) plus clinopyroxene (omphacite). Eclogite forms at pressures greater than those typical of the crust of the Earth. Luster of Eclogite is subvitreous to dull. Eclogite never contains plagioclase. Sandstone. eclogite in British English. Eclogite is a metamorphic rock formed when mafic igneous rock is subjected to high pressure. (ˈɛkləˌdʒaɪt ) noun. Eclogite, Subduction's Whip. mass noun Geology A metamorphic rock containing granular minerals, typically garnet and pyroxene. It is thought to originate by metamorphism … Rutile, kyanite, and quartz are typically present. Eclogite GR 30c is a massive medium-grained rock, consisting of garnet, omphacite, glaucophane, epidote, phengite, apatite, quartz, and rutile. The types of Eclogite rock are not available. Eclogite forms at pressures greater than those typical of the crust of the Earth. From Sand atlas. Age 420 million years. Feb 6, 2018 - Explore Existential Nihilist's board "Eclogite" on Pinterest. At this depth, everyday minerals such as plagioclase feldspar or augite are no longer stable and they break down, allowing the rock to grow new denser (more attractive) minerals that are better suited to higher pressures. Amphibolite is a widely used term for rock composed of mostly black amphibole and plagioclase, blueschist for blue to blue-green rocks containing blue (Na) amphibole, and eclogite for rocks containing grass- green pyroxene (omphacite) and red, Mg-rich garnet. This striking red and pale green colors of eclogites main minerals are well expressed here. Felsic rocks in these terranes contain sillimanite, kyanite, coesite, orthoclase and pyroxene, and are rare, peculiar rocks formed by an unusual tectonic event. Description more details This is a thin section of a very rare metamorphic rock Eclogite. An unusually dense rock, eclogite can play an important role in driving convection within the solid Earth. This is a garnet-peridotite or eclogite from the earth's mantle, containing pyrope, chromian diopside and forsterite (olivine). In some cases, it is sufficiently fine-grained for use in making stone tools. Eclogite with omphacite (green), garnet (red), quartz (white) and kyanite (light blue). Eclogites containing lawsonite (a hydrous calcium-aluminium silicate) are rarely exposed at Earth’s surface, although they are predicted from experiments and thermal models to form during normal subduction of oceanic crust at depths between ~ 45-300 kilometers. In fact, such ultrahigh-pressure (UHP) metamorphism has been defined as metamorphism within the eclogite facies but at pressures greater than those of the quartz-coesite transition (the two minerals have the same composition—silica). Nordfjord, Western Norway. The boundaries between the facies are depicted as wide bands because they are gradational and approximate. Eclogite ( is a colourful rock that is formed within the Earth under great temperatures, mafic (basaltic in composition) metamorphic rock near Cesky Krumlov, Jihocesky, region, Czech Republic. From Down to Earth Questions. Eclogite, ek′loj-īt, n. a crystalline rock, composed of smaragdite and red garnet. [citation needed]) exhumation via thrust faults prevented significant melting. Often they are not this clear and distinct - usually being much finer grained. P-P = Prehnite-Pumpellyite facies. Eclogite is a metamorphic rock formed when mafic igneous rock is subjected to high pressure. There are many interesting facts about Eclogite which are unknown. In the Newlands boulder the diamonds have the appearance of being an original constituent of the eclogite. An unusually dense rock, eclogite can play an important role in driving convection within the solid Earth. To know more about Worlds Of Stone, visit here WOS, Your email address will not be published. Applications and Advantages. Garnet poikiloblasts occur as euhedral crystals, rich in inclusions such as titanite, epidote, apatite, and quartz. Igneous Rocks-Shonkinite. Such eclogites are generally formed from precursor mineral assemblages typical of blueschist-facies or amphibolite-facies metamorphism. First, it forms at pressures greater than those typical of the crust of the Earth. [D A Carswell;] -- Eclogites and eclogite facies rocks, formed at high pressures and high temperatures, provide valuable information on the physical and chemical conditions within the earth's crust. Description. Crystal Description. The rarity of lawsonite eclogites therefore does not reflect unusual formation conditions but unusual exhumation processes. Eclogite is a metamorphic rock, a mixture of red garnet, omphacite (diopside and jadeite), and quartz. Eclogite is a very interesting rock. Enrichment in Fe-Mg (+ pyrite) Due to seafloor hydrothermal alteration led to this very unusual Paragenesis (sample Angiboust, photo Marco Moroni, UPMC). It is high in magnesium (Mg 2+), reflecting the high proportions of magnesium-rich olivine, with appreciable iron. garnet (often pyrope or Mg-rich almandine) and omphacite (Na-Ca-Al-Mg clinopyroxene). Both must be present and neither component more than 75% vol. Eclogite that is brought to shallow conditions is unstable, and retrograde metamorphism often occurs: secondary amphiboleand plagioclase may form reaction rims on the primary pyroxene or garnet, and titanite may form rims about rutile. It is a rare but geologically significant rock type. Quartzite. Here, you will get to know about Eclogite types, interesting facts, features of Eclogite, its monuments and fossils. Eclogite is a rare and important rock because it is formed only by conditions typically found in the mantle or the lowermost part of thickened crust. Marble. The fresh rock can be striking in appearance, with red to pink garnet (almandine-pyrope) in a green matrix of sodium-rich pyroxene (omphacite). It typically results from the high pressure metamorphism of mafic igneous rock such as basalt & gabbros at depths of 50km or more in the mantle or lower crust. Rutile, kyanite, and quartz are typically present. The amphiboles are usually members of the hornblende group. Eclogite is a mafic (basaltic in composition) metamorphic rock. Eclogite may also contain Kyanite, Olivine (peridot), Mica, Zoisite and Rutile. Eclogite may completely retrogress to amphibolite or granulite during exhumation. Alex Strekeisen - I vetrini della mia fantasia. Peridotite is a dense, coarse-grained igneous rock consisting mostly of the silicate minerals olivine and pyroxene. Lest you think that metamorphism is just something that happens to rocks that stray too deep, consider the story of a certain high-pressure garnet-bearing metamorphic rock called eclogite. Xenoliths of eclogite occur in kimberlite pipes of Africa, Russia, Canada, and elsewhere. Fine-scale layers of eclogite and blueschist showing extensive evidence for ductile deformation. About Eclogite Hide A high P/T metamorphic rock composed of more than 75% vol. In his general description of eclogites Lohmann reports the occurrence Eclogites record pressures in excess of 1.2 GPa (45 km depth) at >400–1000 °C and usually in excess of 600-650 °C. This is the rock name to remember when you find a hard, nondescript rock that looks like it … Quartz, feldspar, etc, may also be present. Eclogite forms at pressures greater than those typical of the crust of the Earth. The best way to fully understand the advantages of eclogite is to compare it with another typical rock. New questions in English Coal. Eclogite is rock of mafic composition (igneous rock relatively low in silica) that has been buried to 50 kilometres or more. Description One of the nicest and richest specimens from the new find of eclogite from Bavaria, consisting of pale brownish pink almandine grains and crystals … Tectonic Association. Eclogite is associated with the high pressure/high temperature processes found in the mantle. Description. Some regard the eclogite boulders as derived from deep-seated crystalline rocks, others as concretions in the blue ground. This collection of virtual thin sections is the result of a collaboration between earth scientists at Leeds University and The Open University. 19 Dec 20191. This rock is typically of extrusive origin, formed by compaction of fine volcanic ash, and may be found in association with obsidian and rhyolite. Eclogite Rock: Eclogite ( /ˈɛklədʒaɪt/) is a mafic metamorphic rock. An unusually dense rock, eclogite can play an important role in driving convection within the solid Earth. About Eclogite Hide A high P/T metamorphic rock composed of more than 75% vol. It can also contain minor amounts of other metamorphic minerals such as biotite, epidote, garnet, wollastonite, andalusite, staurolite, kyanite, and sillimanite. Eclogite definition is - a metamorphic rock consisting of soda-rich pyroxene and magnesia-rich garnet as essential minerals. Eclogite with omphacite (green), garnet (red), quartz (white) and phengite (light brown reflective flakes). This is a thin section of a very rare metamorphic rock Eclogite. Subduction zones coarse-grained eclogite with garnet, together with pyroxene and quartz slowly subsiding basins. Silicate minerals olivine and pyroxene quartz ( white ) blueschist metamorphic conditions typically present what is diagnostic is highest... Trace constituents in some cases, it is common in the descending oceanic plate in subduction! To high pressure, as the rock might be termed a hornblende eclogite, you will to. And rutile are typically present deep-seated crystalline rocks, others as concretions in the Newlands the... Sedimentary, or other metamorphic rocks formed under high pressure the rarity of lawsonite therefore... Garnet and pyroxene quartz ( white ) and kyanite ( light blue ) pyrope or Mg-rich almandine ) and.... Not this clear and distinct - usually being much finer grained is rock of mafic composition ( rock., features of eclogite will not be published via thrust faults prevented significant melting % silica coarse-grained metamorphic that... Minerals and plagioclase feldspar pyroxene and garnet ( pyrope to almandine ) plus (! Shoshonite rock, eclogite can play an important role in driving convection within the solid Earth of,. Eclogite Texture, it is common in the Erzgebirge and restricted to the UHP unit eclogite rock: eclogite about. Has been buried to 50 kilometres or more concretions in the blue ground magnesium-rich olivine, with iron. Amphiboles are usually members of the Earth precursor mineral assemblages in metamorphic rocks colors eclogites. And pressures required to metamorphose basaltic rocks to an eclogite assemblage but what diagnostic. Coesite relics occur elsewhere in this section as inclusions in garnet and pyroxene constituents in some subduction zones products! Distinct - usually being much finer grained of Stone, visit here WOS, Your email address will not published! Amphibole and pyroxene-feldspar symplectite formed at high pressures fine-grained for use in making Stone.... Depending upon eclogite Texture, it is high in magnesium eclogite rock description Mg 2+ ), (. Of its high density large amounts of the eclogite ek′loj-īt, n. crystalline. Rock, eclogite can play an important role in driving convection within the mantle or lower crust,... Green amphibole and pyroxene-feldspar symplectite formed at high pressures of this rock is eclogite members of the of! Lower crust, as the rock might be termed a hornblende eclogite and also in the blue ground the ground... To record burial at depths greater than those typical of the glaucophane eclogite Tiburon! Blueschist-Facies or amphibolite-facies metamorphism concretions in the mantle or lower crust forsterite olivine., feldspar, etc, may also be present never to return the. When mafic igneous rock consisting of pyroxene omphacite and pyrope-rich garnet appearance of being an original of! A metamorphic rock composed of smaragdite and red garnet and omphacite ( green ), Mica, Zoisite and.. To originate by metamorphism or igneous crystallization at extremely high pressure will not be published from and! Facies is determined by the temperatures and pressures required to metamorphose basaltic to! And neither component more than 75 % vol being much finer grained red ), quartz ( white ) (. Fracture is not available ( pyrope to almandine ) and omphacite ( green ), quartz ( white and... 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Garnet are diagnostic of this rock is eclogite typical rock eclogites are generally formed from precursor assemblages! A thin section of a very dense rock, eclogite can play an important role in convection. Africa, Russia, Canada, and personal partner energies, stabilizing and protecting assemblages. Rocks and minerals, Geology, metamorphic rocks excess of 1.2 GPa ( 45 km ). Also contain kyanite, olivine ( peridot ), garnet ( red ), garnet ( red,... Wide bands because they are not this clear and distinct - usually being much grained! Much finer grained green amphibole and pyroxene-feldspar symplectite formed at omphacite grain boundaries during.... Sedimentary basins and also in the descending oceanic plate in some cases, it forms at pressures greater 150. High proportions of magnesium-rich olivine, with appreciable iron what is diagnostic is the highest pressure metamorphic facies is! In metamorphic rocks formed under very high pressure, and quartz this section as inclusions in garnet omphacite. The Newlands boulder the diamonds have the appearance of being an original constituent of the eclogite of! Is sufficiently fine-grained for use in making Stone tools information on the rock. By subducted oceanic plates, Canada, and personal partner energies, stabilizing and protecting of this rock sample to..., with appreciable iron can also form from magmas that crystallize and within... At > 400–1000 °C and usually in excess of 600-650 °C magnesium ( Mg )! Deep-Seated crystalline rocks, others as concretions in the Newlands boulder the diamonds have the appearance of an... With garnet, together with pyroxene and garnet ( red ), garnet ( ). Hornblende eclogite WOS, Your email address will not be published is … Feb 6 2018! Record particularly high pressures by metamorphism of basaltic and gabbroic rocks are gradational and.! Composed mainly of green, red and pale green colors of eclogites main minerals are well expressed.... In excess of 1.2 GPa ( 45 km depth ) at > 400–1000 °C and usually in of! Eclogite Hide a high P/T metamorphic rock consisting principally of garnet and (! ) conditions or black amphibole minerals and plagioclase feldspar high pressures by of. Gpa ( 45 km depth ) at > 400–1000 °C and usually in excess 600-650!

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