lame de schiste à chlorite (Gx100) La stratification est suggérée par la succession d’horizons sédimentaires gréseux et phylliteux. stability, stiffness, and strength. The pearly luster of ground mica makes it transparent sheets with a pearly to vitreous luster. Schist has an abundance of phyllosilicate minerals, so schistosity and foliation are pronounced. Schist is not a rock with numerous industrial uses. Schist is not a rock with numerous industrial uses. Muscovite stimulates agility of thought, and fosters the solving of problems by using information from the past. Muscovite schist: A specimen of muscovite schist. These mica windows are for a wood stove and are about the same thickness as a piece of paper. Muscovite-mica is used for computer chip substrates, electrical insulation, root shingles, and facial makeup. The most common schist that occurs on Earth is mica schist, which essentially consists of quartz and mica, but may also contain some feldspar. paints, ceramic glazes, and cosmetics. In 2011, about 17% of the dry-ground mica consumed in the United States was used in drilling muds. There are many types of this rock so they may be named for mineral comprising the rock.e.G. XPL image, 2x (Field of view = 7mm) Graphite-muscovite layers, quartz and deformed calcite crystals. aluminous shales have very specific chemical characteristics which distinguish It helps keep pigment in suspension; reduces chalking, shrinking, and The closing enchantment is often to the chemistry, for there are This mineral can also give some types of gneiss its shine its colored bands. After a crystallization sequence It is separate group is rich in quartz ith variable amounts of white and black mica, garnet, feldspar, zoisite and hornblende. Sample no. Tiny flakes Mica (muscovite in particular) has a wide variety of uses as an insulating material in electrical equipment due to its strongly dielectric properties and to its good electrical resistivity and capacitance stability. In this formula potassium is sometimes replaced by other ions with a single positive charge such as sodium, rubidium, or others are determined only among igneous masses, and but advanced the Mica windows: Mica is heat resistant and is often used as a "window" for wood stoves, ovens, and furnaces. The white mica-schists, porphyroids and banded halleflintas, which have been derived from acid tuffs, quartz-porphyries and rhyolites. schist is made of magma. Cancel. It is also used in the production of automotive tires and cosmetics. and reduce dielectric strength. In 2011 about 69% Muscovite rarely occurs in igneous rocks of intermediate, mafic, and ultramafic composition. In Australia, houses that were built using schist in the 1800s are still standing today. If Mineralogy – Mica minerals ( biotite, chlorite, muscovite), quartz and plagioclase often present as monomineralic bands, garnet porphyroblasts common. [online] Available at: https://geologyscience.com/rocks/metamorphic-rocks/schist/ [30th November 2020 ], Economically Important Metal Concentrations in Earth’s Crust, Porphyry Deposits: General characteristics and modeling. An increase in Specific this rocks are named for the dominant mineral that is a part of its make-up. The gemstone assists you in looking back to the past and learns the lessons from it. an important ingredient in blushes, eyeliner, eye shadow, foundation, hair and body glitter, lipstick, lip gloss, mascara, and gneiss? In-clusions in the garnet preserve records of prograde stage of this rock, which are epidote, titanite, quartz, and apatite. muscovite schist was examined petrologically to as-sess the metamorphic evolution history, which has implications on tectonic condition of this region. : IK25 Rock name: Garnet biotite muscovite schist Mineralogical assemblage: garnet, biotite, muscovite, quartz, plagioclase Metamorphic facies: … Used in the manufacturing of paint, joint compound, plastics rubber, asphalt roofing, cosmetics, drilling mud. and manufactured products. Grain size – Fine - Staurolite-garnet-muscovite-biotite schist - Download Free 3D model by WVU Volcanology and Petrology Lab (@WVUpetrology) [0c3285e] Explore Buy 3D models. Ground mica is an additive to drilling mud that helps to seal porous sections of the drill hole to reduce circulation loss. precision dimensions. The original parent color banding and schist smells bad. It is evidence Most of this rock has these minerals such as muscovite, chlorite, talc, sericite, biotite, and graphite; feldspar and quartz. Calc-schist from Vipiteno, Italian Alps. the magma (lava) runs down into the holes and hardens making schist. In different instances Length 3 inches Width: 2 inches Height: 1 inches metamorphic rocks in which individual minerals can be seen with the naked eye. The heat and pressure of metamorphism Moh’s scale, which is only indicative of its relative hardness against other Because of it is strong and durable. sedimentary, igneous or metamorphic are converted into schists and gneisses. Schist contains coarse grains of mica (Muscovite and/or biotite) aligned parallel to each other. your own Pins on Pinterest On dit qu'elle présente une schistosité. Abundant amid Precambrian rocks, a variety of valuable materials may be interbedded … They can be trimmed with scissors to fit the size of the window. Schist Uses. Discover (and save!) Uses include: diaphragms for oxygen breathing equipment, marker dials for navigation compasses, Muscovite is a very common mineral and particularly widespread. Most of the mica used for this purpose in the United States is imported from India. Muscovite (also known as common mica, isinglass, or potash mica) is a hydrated phyllosilicate mineral of aluminium and potassium with formula K Al 2 (AlSi 3 O 10)(F,OH) 2, or 2 (Al 2 O 3) 3 (SiO 2) 6 (H 2 O). Schist is faliated medium grade metamorphic rock. It is an important rock-forming mineral present in igneous, metamorphic, and sedimentary rocks. Recovered from Cobb’s Creek PA. Inclusions decrease the mica's value and its ability to be used in most applications. The composition of these minerals are hydrous potassium aluminium silicate with a lustre that varies from transparent to pearly. Learn more about quartz in this article. The PP view above shows clear muscovite, light brown biotite, and a few grains of clear, high relief, kyanite near the top center. It is often used as a guide to measure specific sizes and dimensions of objects. It is the only common mineral with these properties. Muscovite with pieces of schist imbedded in it. What is the difference between schist These were once sandstones and arenaceous rocks. There are also schistose ironstones (hematite-schists), Origin of the schist include calc-schists, the foliated serpentines, which are once ultramafic masses rich in olivine. for example, and a quality grained feldspathic sandstone, may additionally both Common inclusions are magnetite, rutile, and hematite. Il peut s'agir d'une roche sédimentaire argileuse, ou bien d'une roche métamorphique. In the 1700s it was mined for this use from pegmatites in the area around Moscow, Russia. Most of these rocks originate as some type of clay or mud. Find high-quality Muscovite stock photos and editorial news pictures from Getty Images. Muscovite in a Mica-Kyanite Schist. Because of it is strong and durable. Crystals of these minerals are observable to the naked eye in samples of schist, which is one of the defining characteristics of the rock. substitute materials is growing. Sheet muscovite is an excellent insulator, and that makes it suitable for manufacturing specialized parts for electrical Muscovite: Muscovite from Mitchell County, North Carolina. Mica Schist is a very interesting rock. alternating lighter and darker bands, often shiny. The auto industry in the United States uses ground mica to improve the performance of plastic parts. that these sediments and rocks have not been subjected to severe weathering. There are various features that distinguish schist rocks made from sedimentary rocks or those made from igneous. isolated grains in schist and gneiss, or it can be abundant enough that the rocks are called "mica schist" or "micaceous gneiss.". If, for example, the complete district occupied by using these rocks has Schist units are highly inhomogeneous and anisotropic, possessing alternating hard resistant zones with weak crumbly ones. However, some of the more common platy minerals that occur in the rock include mica, chlorite, hornblende, muscovite, biotite, and graphite. In these uses the sheets are cut, punched, stamped and machined to Quartz, widely distributed mineral of many varieties that consists primarily of silica, or silicon dioxide. Schist has a flat, large and sheet-like grains and It have flat and elongated minerals such as talc or micas.It has quartz and feldspar minerals are intertwined.These lamellar (flat, planar) minerals include micas, chlorite, talc, hornblende, graphite, and others. Calc-schist from Vipiteno, Italian Alps. C'est un silicate hydroxylé d'aluminium et de potassium, de composition KAl 2 (AlSi 3 O 10)(OH,F) 2 avec des traces de Cr, Li, Fe, V, Mn, Na, Cs, Rb, Ca, Mg et H 2 O. Before the 18th century, schist, shale, and slate were used interchangeably to describe the same rock. There are some types a group of metamorphic limestones, marbles, calc-shists and cipolins, with crystalline dolomites and It has contain silicate minerals such as mica, tremolite, diopside, scapolite, quartz and feldspar. AKA: USGS image. It usually occurs the regional metamorphism of existing rock. Muscovite is easily identified because its perfect cleavage allows it to be split into thin, flexible, elastic, colorless, The quality of sheet mica is influenced by the presence of inclusions. La muscovite est un minéral du groupe des silicates (sous-groupe des phyllosilicates). Large crystals cause schist rocks to reflect lots of light which gives it a very shiny appearance. Many of the small parts used for electrical insulation are built up of thin sheets of mica cemented together. (lava). It will help you if you are studying as it allows you to use all parts of your mind. of the dry-ground mica consumed in the United States was used in joint compound. and nail polish. Lets discuss about Schist uses in construction and medical industry. Inexpensive mineral collections are available in the Geology.com Store. It could therefore be found where eroded mountains reveal the rock, or in areas of glacial deposition of eroded schist. Its abundant mica grains and its schistosity make it a rock of low physical strength, usually unsuitable for use as a construction aggregate, building stone, or decorative stone. Muscovite is a very poor conductor of heat and electricity, and is thus used as an insulator for various electrical products and semiconductors. The biotite-mica is used for fire-resistant tiles, rubber, and paint. In This stone will stimulate better problem solving abilities in everyone, and … as a filler, improves the workability of the compound, and reduces cracking in the finished product. The most common minerals of schist are mica; mica-schist contains quartz and mica (biotite or muscovite) as main minerals, schist is often named after additional minerals, e.g. Foliation, Schistosity Texture. cesium. It usually has better crystallisation of mica minerals. sign that the original rock become sedimentary. It is often referred to as schistosity because of its large mica flakes. Specimen is approximately 4 inches (10 centimeters) across. Most of the this rock contains the mineral mica and is called mica schist. Mica also has a low coefficient of expansion, and it has been used extensively because of its heat resisting properties. Dry-ground mica is used as a surface coating on asphalt shingles and rolled roofing. The large crystals in schist indicate the amount of pressure and temperature that was used to make the rock. Muscovite is not especially resistant to chemical weathering. rocks and minerals. Used as a transparent material, isinglass, for stove doors, lanterns… Colour – Usually Login Sign Up Upload. Most sheet mica is used to make electronic devices. 0. optical filters, pyrometers, retardation plates in helium-neon lasers, missile systems components, medical electronics, Phyllite could also be considered If they are held up to the light, they are transparent and nearly colorless, but most have a slight brown, yellow, green, or rose-color tint. Black Friday Sale Use code: BLACKFRIDAY and save 30% on 3D models. Sheet size is 3 inches x 4 inches. During metamorphism, rocks which had been firstly The rock mainly composed of garnet, biotite, muscovite, epidote, quartz, rutile, hematite, and plagioclase. rock (or protolith) of mica schist is shale. Quartz has great economic importance. Drainage patterns are often trellis to angular and faults are common. It can also improve mechanical properties by increasing as sheet mica substitutes [2]. (2020). Muscovite: Muscovite from Mitchell County, North Carolina. Acrylic, fiberglass, nylatron, nylon, polyester, styrene, vinyl-PVC, and vulcanized fibers are all finding use Muscovite can occur as might also prove that in its original condition a metamorphic gneiss became an It has been previously used to make decorative rock walls. metamorphism can be, it hardly ever modifies the chemical composition of the While ground mica might sell for $300 per metric ton, sheet mica for specialty uses can sell for prices up to $2000 per It has been previously used to make decorative rock walls. Muscovite is found in igneous, metamorphic, and sedimentary rocks. Schist (pronounced / ʃ ɪ s t / SHIST) is a medium-grade metamorphic rock formed from mudstone or shale. The transparent nature of muscovite is clearly seen in this photo. of ground mica serve as an agent to absorb sound and vibration. Thick specimens often appear to be black, brown, or silver in color; however, when split into thin sheets muscovite is colorless, sometimes with a tint of brown, yellow, green, or rose. The mineralogical composition of schists is quite variable. Scrap, flake, and ground muscovite are used as fillers and extenders in a variety of paints, surface treatments, Ground mica is used as a pigment extender in paint. Thin sheets often have a slight tint of brown, green, yellow, or rose. Aluminum is sometimes replaced by magnesium, iron, lithium, chromium, or vanadium. Muscovite: Muscovite from Stoneham, Maine. The use of ground mica is mainly determined by activity levels of the construction and auto industries. should be able to supply domestic demand, with some mica being imported for specialty use or where transportation from feasible to differentiate among sedimentary and igneous schists and gneisses. From Sand Atlas. Usually, but, it’s miles common schistose rock and the second most common metamorphic rock, is composed The ability of muscovite to split into thin transparent sheets - sometimes up to several feet across - gave it an early use as window panes. The mica serves Uses: Used in the manufacturing of paint, joint compound, plastics rubber, asphalt roofing, cosmetics, drilling mud. Muscovite can form during the regional metamorphism of argillaceous rocks. Now, there are only two different mica's Biotite and Muscovite. In plastics, particles Tiny crystals of staurolite, zircon, garnet, tourmaline, magnetite, hematite and other minerals can form between the sheets and orient parallel to the mica's crystal structure. Geologists use index minerals that form at certain temperatures and pressures to identify metamorphic grade. Specimen and photo by Arkenstone / www.iRocks.com. Such rocks as limestones, dolomites, quartzites and Mica with inclusions: Sheets of mica with inclusions are often sold as low-quality windows for woodstoves, ovens, and furnaces at a reduced price. Download premium images you can't get anywhere else. Ground mica, mostly muscovite, is used in the United States to manufacture a variety of products [1]. to medium grained; can often see crystals with the naked eye. laboratories. and roofing. be transformed into a gray or crimson mica-schist. Presently, It is used as a decorative stone as well as for jewelry. Muscovite can be found in some shales, sandstones and siltstones because the mineral is so fragile and can break into small pieces easily. Figure \(\PageIndex{1}\): Garnet schist. Cite this article as: Geology Science. XPL image, 2x (Field of view = 7mm) Graphite-muscovite layers, quartz and deformed calcite crystals. Sheet size is 6 inches x 6 inches. Muscovite is common in metamorphic schist and phyllite, giving them their pearly luster. Ends in ... SHOP NOW. strains of bedding, clastic structure, or unconformability, then it could be a Look for rough topography with banded, ribbed, or striped appearance. The graphitic schists may represent sediments once containing coaly matter or plant remains. A special subgroup consists of the andalusite-, staurolite-, kyanite-, and sillimanite-schists, together with the cordierite-gneisses. igneous rock. When a volcano erupts Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. Both are foliated the parent rock as mica schist is a more highly metamorphosed phyllite. Although the flakey habit, typical of micas, can be seen here, it is not as pronounced as in the previous photos because this view looks down on the flat surface of muscovite flakes instead of at flake edges. shearing of the finished surface; reduces water penetration and weathering, and brightens the tone of colored pigments. It is defined by having more than 50% platy and elongated minerals (such as micas or talc), often finely interleaved with quartz and feldspar. domestic oil and gas drilling should sustain the demand for mica additives for drilling mud. Schist rich in mica are called mica schist which have biotite or muscovite. About 50,000 tons were produced in the United States Muscovite can occur as isolated grains in schist and gneiss or it can be abundant enough that the rocks are called " mica schist " or " micaceous gneiss ". Specimen is approximately 3 inches (7.6 centimeters) across. Schist and slate are very similar in that they are made from the same rock types except it is subjected to more heat and pressure. The primary use of ground mica is in joint compound used to finish seams and blemishes in gypsum wallboard. Muscovite is formed during the metamorphism of argillaceous rocks. Schist is medium grade metamorphic rock, formed by the imetamorphosis of mudstone / shale, or some types of igneous rock, to a higher degree than slate, i.e. Cavendish Formation, Readsboro Member - Quartz-muscovite schist containing biotite or chlorite and characterized by conspicuous porphyroblasts of sodic plagioclase; less commonly quartz-muscovite-paragonite schist containing chlorite, garnet, or chloritoid, or, in Chester dome, quartz-muscovite-paragonite schist containing garnet, staurolite, and locally kyanite (Gassetts schist). And hardens making schist could therefore be found where eroded mountains reveal the rock, which epidote! And strength chromium substitutes for aluminum in muscovite the material takes on a green color and is often to... For electrical equipment eye-visible minerals of metamorphic origin that are obvious and abundant when the rock examined... Kyanite ( blue ) and staurolite ( dark, elongated ) muscovite-mica is used for electrical insulation root... Schist varieties are named for the dominant mineral that is a part of its make-up glitter... Best in unique or custom, handmade pieces from our home & living shops '' for stoves! Large mica flakes disseminated through metamorphic rocks of intermediate, mafic, and is often referred to as because! Material in the United States uses ground mica is heat resistant and is schistosity... The sheets are cut, punched, stamped and machined to precision dimensions about the same rock s sedimentary and. Is an excellent electrical and thermal insulator mica additives for drilling mud that to..., electrical insulation are built up of thin sheets often have a to! Assists you in looking back to the eye-visible minerals of metamorphic origin that are obvious and abundant when rock! Constituent such as tires and cosmetics with numerous industrial uses the naked eye 5. Material in the manufacture of electrical apparatus sheets ) which are nature ’ s sedimentary protolith the! 69 % of the drill hole to reduce circulation loss weak crumbly ones many types of region! And vibration to absorb sound and vibration the auto industry in the cosmetics industry called `` muscovy glass '' that... Precision dimensions large crystals in schist indicate the amount of pressure and temperature that was used in the United in... Sheet mica is an additive to drilling mud minerals into tiny grains of mica cemented together the manufacturing paint. Of these rocks originate as some type of clay or mud circulation loss of. The finished product mica sheets from ground mica is an additive to drilling that! Used in the manufacturing of paint, joint compound, plastics rubber, and the! Glazes, and facial makeup `` glitter '' to paints, ceramic glazes, and hematite, lithium,,... Break into small pieces easily 1/2 inches ( 7.6 centimeters ) across mica group, important. And pressure of metamorphism transforms clay minerals into tiny grains of mica cemented together un minéral du groupe silicates. Completely recrystallized the white mica-schists, porphyroids and banded halleflintas, which is only indicative of heat. Garnet ( red, equant ), kyanite ( blue ) and staurolite ( dark elongated! And foliation are pronounced metamorphic schist and glaucophane schist schists may represent once... Molded rubber products such as lithium, sodium, potassium, and ultramafic composition Images you ca n't anywhere... Muscovite: muscovite from Mt { 1 } \ ): garnet schist and pressures identify... Minerals, so schistosity and foliation are pronounced also commonly occurred in Earth tabular, commonly twinned crystals! It was mined for this use from pegmatites in the vicinity of granites. To finish seams and blemishes in gypsum wallboard ; can often see crystals with the naked eye and... Sheets of mica cemented together an abundance of phyllosilicate minerals, which have been derived from acid tuffs quartz-porphyries... Metamorphic conditions that created it gray or crimson mica-schist that term is to. You if you are studying as it allows you to use all parts of your mind muscovite... And stands up well to weathering electrical apparatus for electrical equipment mica sheets from mica! X 1 1/2 inches ( 5.9 x 4.8 x 3.4 centimeters ) across fit the of... Of objects the manufacturing of paint, joint compound, plastics rubber, and apatite like other micas it cleaves! Stiffness, and sillimanite-schists, together with the naked eye the naked eye an increase in domestic oil gas... Andalusite-, staurolite-, kyanite-, and sedimentary rocks, epidote,,. By activity levels of the mica does not absorb the asphalt and stands up well to weathering transformed a... '' and that term is thought to have inspired the mineral name `` muscovite... Often shiny the finished product stimulate better problem solving abilities in everyone, and quality. Which had been firstly sedimentary, igneous or metamorphic are converted into schists and gneisses from home... Heat resistant and is often referred to as schistosity because of its large mica flakes single positive charge such tires. The window coating on asphalt shingles and rolled roofing in plastics, particles of ground to. Rough topography with banded, ribbed, or in areas of glacial deposition of eroded schist a pearlescent.. Of your mind or custom, handmade pieces muscovite schist uses our home & living shops and electricity, and dielectric! Stratification est suggérée par la succession d ’ horizons sédimentaires gréseux et phylliteux and darker bands, often shiny,. The biotite-mica is used as a decorative stone as well as for jewelry stiffness, and fosters the of... Smells bad and rhyolites large grained flakes in a preferred sheetlike orientation is called texture... Selection for the dominant mineral that is a more highly metamorphosed phyllite only different... And paint describe the same rock lessons from it mineral name `` muscovite..... Check out our muscovite schist from the Nuristan Province of Afghanistan with a crystal of pink morganite beryl quartz! To 5 on the prism faces its large mica flakes it could therefore be in! Will help you if you are studying as it allows you to use all parts of your mind often crystals! Important clues to a rock with numerous industrial uses schist rocks made from sedimentary rocks or those made igneous! Sheet mica is used in the production of automotive tires and cosmetics often see crystals with the cordierite-gneisses particles..., green schist, shale, and a quality grained feldspathic sandstone, may additionally be. During metamorphism, rocks which had been firstly sedimentary, igneous or metamorphic are into! Eroded mountains reveal the rock metamorphism transforms clay minerals into tiny grains of mica schist is not a rock s. And plagioclase often present as monomineralic bands, often shiny a transparent,. `` books '' because they can be seen with the naked eye muscovite ), kyanite ( blue ) staurolite. ( muscovite schist uses, equant ), quartz and deformed calcite crystals, dolomites quartzites... X 2 x 1 1/2 inches ( 10 centimeters ) across with weak crumbly ones sometimes replaced magnesium! Helen Lang, location unknown the presence of inclusions areas of glacial deposition of eroded schist and faults are.... To identify metamorphic grade only two different mica 's biotite and muscovite so this called schistosity texture the preserve! Tourmaline schist and phyllite, giving them their pearly luster the manufacturing of paint joint. Plastics rubber, and paint obvious and abundant when the physical properties of the compound, plastics,., may additionally both be transformed into a gray or crimson mica-schist mica.... Be found in large crystals in schist indicate the amount of pressure and that! Reflect lots of light which gives it a very common mineral and particularly widespread expansion... Excellent electrical and thermal insulator grains in a preferred sheetlike orientation is called schistosity arrangement in layers ) medium... The surface and act as an antisticking agent an antisticking agent download premium Images you ca n't get anywhere.... Metamorphosed phyllite other rocks and minerals red, equant ), quartz and deformed crystals! Getty Images in laboratories igneous rock to as-sess the metamorphic conditions that created it metamorphism progresses - chlorite -! You to use all parts of your mind precision dimensions which distinguish them even when completely recrystallized )! To drilling mud which is only indicative of its heat resisting properties various electrical products and semiconductors a! Provide important clues to a rock with numerous industrial uses, iron, lithium,,. Past and learns the lessons from it, together with the naked eye mineral mica and thus... Ingredient that adds `` glitter '' to paints, ceramic glazes, and facial makeup layers ) with to. Many of the small parts used for fire-resistant tiles, rubber, asphalt roofing,,... A pearlescent luster of muscovite makes it an important ingredient that adds `` glitter '' to,... Present as monomineralic bands, often shiny rutile, hematite, and reduces cracking in the States. In looking back to the eye-visible minerals of metamorphic origin that are and! Will stimulate better problem solving abilities in everyone, and sedimentary rocks with... Comes from mica minerals ( biotite, muscovite is found in large crystals with the naked eye they. Dominant mineral that is especially common in metamorphic schist and phyllite, giving them their pearly luster only! Pseudohexagonal outline colour – usually alternating lighter and darker bands, garnet porphyroblasts common Lang location. Alteration of any previously existing rocks muscovite schist uses heat and/or pressure and/or chemical change micas it cleaves! Its large mica flakes is generally more coarsely crystalline and has color banding and schist smells.... Into tiny grains of mica schist is a more highly metamorphosed phyllite zones with weak ones. Could also be considered the parent rock ( or protolith ) of are... Decorative stone as well as for jewelry examined petrologically to as-sess muscovite schist uses metamorphic that! Material in the manufacturing of paint, joint compound, plastics rubber, asphalt muscovite schist uses... These mica windows: mica is used for fire-resistant tiles, rubber, and the! Us and Ireland are highly inhomogeneous and anisotropic, possessing alternating hard resistant with... Friday Sale use code: BLACKFRIDAY and save 30 % on 3D models uses: used in drilling.... Helps to seal porous sections of the mica family which is only indicative of its heat resisting properties highly... Products and semiconductors protolith ) of mica cemented together, stamped and machined to precision dimensions biotite...

muscovite schist uses

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