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what type of rock is gneiss

Folded Gneiss: A photograph of polished gneiss from the stock of a countertop vendor. This is a rock that is formed from pre-existing igneous rocks such as granite that have been subject to conditions of high pressure and temperature. It means a type of rock texture, not a composition. Shale can metamorphose into slate, phyllite, schist or gneiss depending on the degree of heat and pressure. The following is a list of rock types recognized by geologists. Don't be surprised if you see gneiss labeled as "granite" at a cabinet shop or monument company. In fact, in some places, the rock has actually been partially melted, and the melt was injected, or squeezed into the layers of the remaining solid portions of the gneiss, creating a type of gneiss known as migmatite. Gneiss rocks exhibit a unique form of foliation known as gneissic banding, which are thicker bands of foliation than most metamorphic rocks display. the platy micas begin to recrystallize into granular minerals. Carolina, US, east of the Brevard Shear Zone. It is distinctive among other rocks that have bands because its minerals are not evenly distributed so the bands are various widths. alternating lighter and darker sub-parallel discontinuous bands. A good example of an igneous rock is granite. The end product of their metamorphism During this transformation, clay particles in shale transform into micas and increase in size. Gneiss is very common and actually forms the majority of the Earth's lower crust, so any deep tunneling encounters gneiss. The use of the word gneiss dates back to the mid-1700s. gneiss meaning: 1. a type of metamorphic rock that contains light and dark layers formed of minerals such as quartz…. Gneiss. This metamorphic rock is usually identified by distinctive bands of … This pattern is called foliation and it’s a result of the rock being squeezed and heated. Gneiss is a high-grade metamorphic rock having many of the aerial photograph characteristics of granite. Other features: Generally And if you know your igneous petrology, you will see that the more mafic (rich in magnesium and iron) a rock is, the greater its density. minerals might include biotite, cordierite, sillimanite, kyanite, staurolite, andalusite, and garnet. Ribbonlike layers. Teachers Texture: Foliated, In addition to the Outer Hebrides, they form basement Gneiss: Gneiss is a foliated metamorphic rock, meaning it is a metamorphic rock that contains layers or bands. Teachers can avoid these problems by collecting specimens that clearly display a banded structure. Fault, and the first deformation results from displacement to the southwest. What is the parent rock of gneiss? The darker bands have Migmatite is a rock composed of metamorphic host material that has parts of granite rock running through it. Gneiss is metamorphic and not elementary as rock. It’s a bit much even for geology majors. Orthogneiss designates a gneiss derived from an igneous rock, and paragneiss is one from a sedimentary rock. Click to enlarge. Metamorphic rocks. Additionally, different classification systems exist for each major type of rock. Gneiss. Squeezed and heated. to coarse grained; seeing with the naked eye. granitic and volcanic rocks. “So what type of rock is The Rock? It is made up of clay minerals. Colour: generally It is said to be a German word meaning sparkling or bright. Any water that is present in the minerals pre-metamorphism is frequently lost as the temperature increases, resulting in hard metamorphic rocks that are generally resistant to dissolution in water. Finally, Schist is made from medium grade, while Gneiss is made from a higher grade. Probably origin is german These temperatures cause the individual minerals to migrate, forming distinct bands through the rock. Gneiss is a common and widely distributed type of metamorphic rock. Schist is mainly made from rocks like slate. Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. However, many rock units, identified as gneiss in the field, have bands that are thicker The point I am trying to make is that there are different classes/types of igneous rocks, but only a few are found in the Himalayas. Mineralogy: Felsic minerals such as feldspar ( orthoclase, plagioclase) and quartz generally form the light coloured bands; mafic minerals such as biotite, pyroxene ( augite) and amphibole ( hornblende) generally form the dark coloured bands; garnet porphyroblasts common. Some also contain larger crystals imbedded in the rock matrix, most frequently garnet, topaz, and beryl minerals. Paragneiss is gneiss derived from sedimentary rock (such as sandstone). Gneiss usually does not split along planes of weakness like most other metamorphic rocks. minerals, containing more of the lighter elements, which include silicon, Orthogneiss is gneiss derived from igneous rock (such as granite). Beautiful floor tiles, facing stone, stair treads, window sills, counter tops, and cemetery monuments are regularly crafted from polished gneiss. Garnet Gneiss: A cabochon cut and polished from garnet gneiss. Gneiss is a foliated metamorphic rock that is a common distribute type of rock high-grade regional metamorphic approaches from pre-current formations that have been initially both igneous or sedimentary rocks. It is this banded appearance and texture - rather than composition - that define a gneiss. is sometimes named for these minerals, examples of which include "garnet gneiss" and "biotite gneiss.". addition to the gneissose texture described above, gneisses tend to be banded Gneiss nearly always shows a banded texture characterized by alternating darker … Gneiss is a foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains. It forms from other rocks that have been _____ and _____ for a long time deep within the earth's crust. Parent Rock: Shale, This allows contractors to apply as a overwhelmed stone in road production, building web site guidance, and landscaping tasks. Contains a wide variety of rock types including graphitic schist and marble. This specimen is about four inches across and has a round blue sapphire crystal on the left side. Gneiss. a challenging way to have students: A) consider possibilities that are not obvious, and, B) realize that a porphyroclasts, typically microcline, within the layering of the quartz, This is the rock name to remember when you find a hard, nondescript rock that looks like it … In the dimension stone trade, any rock with visible, interlocking grains of feldspar is considered to be "granite" in that industry. Gneiss (pronounced "nice") is a metamorphic rock consisting mostly of quartz and feldspar and showing distinct layering or banding. The types of Gneiss include Augen Gneiss, Henderson Gneiss, Lewisian Gneiss, Archean and Proterozoic Gneiss.. Metamorphic rocks are formed when intense temperature and pressure alter a pre-existing rock physical and or chemical structure. Based upon how they are formed and the geological process involved in it, rocks are classified into following three types: The geologist pries at the rock, and it splits apart along the bands formed by the layers. It has a glorious banding which is apparent on microscopic scale and hand specimen. It’s characterized by stripes, linear bands, or flowy rivers of color. Many rocks were injected by a granitoid that has blue quartz and augen of potassic feldspar and are arteritic migmatites. Learn more. In this section, we will discuss about Gneiss types and facts. Gneiss. Granite and quartz veins and pegmatites are common. Some gneiss is durable enough to perform well as a dimension stone. Gneiss is a medium- to coarse-grained, semischistose metamorphic rock. If samples of these rock units are broken into one-inch pieces, many of them will be too small band. oxygen, aluminium, sodium, and potassium). The light bands of gneiss are generally composed of quartz quartz, one of the commonest of all rock-forming minerals and … Gneiss is often confused with or associated with granite.This is because Migmatite gneisses contain melted rock and can act as feeder zones for granite minerals. Almost all rocks are divided into types. The rock type is therefore a fundamental factor for every climber and also relevant to safety. Those layers are compositional banding, happens due to the fact the Igneous rock is formed through the … Gneiss is a very common rock type, especially in regions in which the oldest rocks, those of the Achaean age, are found. Corundum Gneiss: This is a specimen of corundum gneiss from Gallatin Valley, Montana. Gneisses of Archean and Proterozoic age occur in the Baltic Final Exam It usually is prominent from schist by its foliation and schistosity; displays a properly-advanced foliation and a poorly advanced schistosity and cleavage. foliation on a scale of cm or more. Quartzite is composed of sandstone that has been metamorphosed. Gneiss may have a protolith of any kind of rock, be it igneous, sedimentary, or another metamorphic rock. [online] Available at: https://geologyscience.com/rocks/metamorphic-rocks/gneiss/ [2nd December 2020 ], Economically Important Metal Concentrations in Earth’s Crust, Porphyry Deposits: General characteristics and modeling, https://geologyscience.com/rocks/metamorphic-rocks/gneiss/. Although gneiss is not defined by its composition, most specimens have bands of feldspar and quartz grains The view shown in the photo is about 12 inches across. alteration increased the size of the mineral grains and segregated them into bands, a transformation Acasta Gneiss: at approximately 4.03 billion years-old, the tonalite gneiss is the oldest rock exposed on the surface of the planet. It has also been used to construct buildings and gravestones. Marble is a non-foliated metamorphic rock which is composed of recrystallized carbonate which is formed when limestone is exposed to high temperatures and pressures over a long time. Learn more. Gneiss is a type of metamorphic rock that forms when a sedimentary or igneous rock is exposed to extreme temperatures and pressure. Schist And Gneiss are both metamorphic rocks. Gneiss. Which type of rock did the geologist most likely find? Seeing gneiss, gabbro, labradorite, diorite, and other types of rock marketed as "granite" disturbs many geologists. Read More on This Topic. The rocks that form gneiss are exposed to extreme pressures and temperatures of between 600 and 700 degrees Celsius. Argillite. is a banded rock with a mineralogical composition like granite. Small rock and mineral specimens about one inch in size are usually adequate for student examination and There are two basic types of metamorphic rocks: Foliated metamorphic rocks such as gneiss, phyllite, schist, and slate have a layered or banded appearance that is produced by exposure to heat and directed pressure. It forms on mountains where movements of _____ _____ have moved rock… Gneiss (/ ˈ n aɪ s /) is a common and widely distributed type of metamorphic rock.Gneiss is formed by high temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks.Orthogneiss is gneiss derived from igneous rock (such as granite). Home » Rocks » Metamorphic Rocks » Gneiss. This pattern is called foliation and it’s a result of the rock being squeezed and heated. It rocks that originate as sedimentary rock are called paragneiss and those originating as igneous rock are called orthogneiss. Gneiss: The specimen shown is about two inches (five centimeters) across. However, this long-time practice of the dimension stone trade simplifies discussions with customers since not everyone knows the technical names of unusual igneous and metamorphic rocks. Gneiss is an igneous rock that looks like it has different stripes or layers in it. Granite is an igneous rock while gneiss is a rock that may have been igneous or sedimentary earlier but has undergone metamorphic process. Sedimentary rocks are created by other rocks or fossils that form deposits on the earth’s surface. The dominant rock type is grayish gneiss that is rich in quartz, feldspar, and iron-rich minerals. These rocks are composed of many distinct minerals. Some of the oldest rocks in the world include the gneiss found in the Minnesota River valley. Gneiss rocks are characterized by their arrangement of minerals into long bands. The appearance of granular minerals is what marks the transition into gneiss. Rhey can also be named after a characteristic component inclusive of garnet gneiss, biotite gneiss, albite gneiss, and many others. These rocks are largely igneous in origin, mixed with It is this banded appearance and texture - rather than composition - that define a gneiss. Regional metamorphism can transform shale into slate, then phyllite, then schist, and finally into gneiss. basaltic dikes and granite magma. Gneisses which can be metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, and so on. Gneiss has the greatest degree of metamorphism in this group. Gneiss, pronounced as ‘nice’, is one type of metamorphic rock found all over in the world today. sequential forms. Igneous rocks are formed by the cooling and solidification of lava or magma. Paragneiss is gneiss derived from sedimentary rock (such as sandstone). Facing Stones . Reviewing this guide can help you know what type of rock marble is, what it is composed of, and answers to some common questions regarding its application in the home. Gneiss can form in several different ways. This allows contractors to use gneiss as a crushed stone in road construction, building site preparation, and landscaping projects. incredibly extra mafic minerals (the ones containing more magnesium and iron). Other bands contain platy or elongate minerals with evidence of preferred orientation. (2020). Rock density is very sensitive to the minerals that compose a particular rock type. Gneiss rocks are characterized by their arrangement of minerals into long bands. These Garnet Gneiss: A coarse-grained gneiss composed mainly of hornblende (black), plagioclase (white), and garnet (red) from Norway. Shale can metamorphose into slate, phyllite, schist or gneiss depending on the degree of heat and pressure. Gneiss is formed by high temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss and schist are often confused but gneiss has more of a coarse texture and does not cleave. Ornamental Stone. Some of it accepts a vibrant polish and is appealing sufficient to be used as an architectural stone. than one inch. Garnet Gneiss: A photograph of polished garnet gneiss from the stock of a countertop vendor. It is made up of clay minerals. Igneous rock is one of the three main rock types. The dark minerals sometimes exhibit an orientation determined by the pressures of metamorphism. Gneiss forms at higher temperatures and pressures than schist. It has a glorious banding which is apparent on microscopic scale and hand specimen. Earth's crust. Learn gneiss with free interactive flashcards. It forms from volcanic rock, shale, or granitic. Charles E. Glass Ph.D., P.E., in Interpreting Aerial Photographs to Identify Natural Hazards, 2013. word Gneis that mean “spark” (rock glitters). Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type. Schist and quartzite may be formed alongside gneiss, along with other types of metamorphic rock formed from igneous rocks. metamorphic rock in which mineral grains recrystallized under intense heat and pressure. Gneiss Uses Flooring. Some sedimentary-derived Lewisian rocks, especially in the region of Loch Maree and South Harris, still retain some of their original sedimentary features and indicate that the sediments were originally shales, sandstones, and some limestones. The other two primary types of rocks are igneous rocks and sedimentary rocks. The Rock Cycle (KS3) | Types of Rock | Metamorphic Rocks | Gneiss Uses. Ribbonlike layers. Other bands contain platy or elongate minerals with evidence of preferred orientation. The "gneissic texture" refers to … Gneiss usually forms by regional metamorphism at convergent plate boundaries. Gneiss Energy is a strategic and financial advisory firm operating within the energy and natural resources sectors. What type of rock is Gneiss? There are many varieties of it, depending on mineral composition and texture, but all gneiss is evidence of deep crustal deformation. It is one of the features that helps differentiate gneiss from other foliated rocks. Courtesy Mark Ryan I recently attended a geology seminar sponsored by the Geological Society of Minnesota.The event took place at Macalester College in St. Paul, and was led by Jeff Thole, laboratory supervisor and instructor in the college's Geology Department. A cabochon cut from this type of material is rarely seen, but it would be an interesting gem for a geologist. Gneiss is mainly made from rocks like granite. The best way to learn about rocks is to have specimens available for testing and examination. GNEISS ENERGY /ˈnaɪs/ - a widely-distributed type of metamorphic rock formed under high temperature and high-pressure. Rock & Mineral Kits: Get a rock, mineral, or fossil kit to learn more about Earth materials. He’s a foliated metamorphic, transitioned to gneiss in 2017. Gneiss Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist.It is formed by the metamorphosis of granite, or sedimentary rock. in an interlocking texture. Squeezed and heated. Gneiss has the greatest degree of metamorphism in this group. Grain size: Medium Gneiss is a medium to course grained metamorphic rock.. Shale is the typical parent rock. metamorphosed marble, quartzite and mica schist with later intrusions of on a large scale with layers and streaks of darker and lighter coloured gneiss. biotite and magnetite bands. Gneiss is a high grade foliated metamorphic rock. Quartz is typically abundantly found in gneiss. gneiss limestone marble sandstone Some of the oldest rocks found on Earth are gneisses. Gneiss can be formed from a sedimentary rock such as sandstone or shale, or it can be formed from the metamorphism of the igneouse rock grantite. The reason rocks undergo metamorphism is that the minerals in a rock are only stable under a limited range of pressure, temperature, and chemical conditions. They are also both made from metamorphosis, but the grade they are made from varies. Gneiss (pronounced "nice") is a metamorphic rock consisting mostly of quartz and feldspar and showing distinct layering or banding. Gneissic Granodiorite: An outcrop of gneissic granodiorite in the Zarembo Island area of southeastern Alaska. Formally, migmatite rock is a mixture of metamorphic rock and igneous rock. It has deformed into two Shield. The process of formation of rocks is different for various rocks. Limestone can change into calcareous gneiss which contains calcium carbonate. Some sedimentary-derived Lewisian rocks, especially in the region of Loch Maree and South Harris, still retain some of their original sedimentary features and indicate that the sediments were originally shales, sandstones, and some limestones. The second, more warped, form is associated with the Brevard A gneiss is produced by intense metamorphism, at high temperature and pressure. The most common path begins with shale, which is a sedimentary rock. of Coll and Tiree. The term gneiss is not only the name of a particular kind of metamorphic rock, but also, in a wider sense, it is used as an expression of a certain texture. identify the rock. ii What type of rock is Gneiss ribbon like layers iii What type of rock is from ISB 002 at Michigan State University Precambrian crystalline terranes approximately 38 x 27 millimeters in size are usually light in color and alternate bands! In mineral composition ( coarser grained than schist ) texture and does not split planes... Alongside planes of weak point like maximum other metamorphic rocks ( pronounced `` nice '' ) a..., kyanite, staurolite, andalusite, and beryl minerals rock are called orthogneiss way. Phyllite, schist or gneiss depending on the surface of the most intense temperatures and pressures: at approximately billion! Are also both made from polished gneiss from the stock of a coarse and! Point like maximum other metamorphic rocks are gneisses, you 'll get thousands of solutions. Agreed number what type of rock is gneiss specific types of rock texture, it is this banded appearance and is sufficient... Because all of its make-up firm operating within the Earth 's lower crust, so any deep tunneling gneiss.. `` back to the minerals that compose a particular rock type is gneiss. The most intense temperatures and pressures than schist ) is rich in quartz and feldspar, the bands... Hornblende, garnet or graphite of weak point like maximum other metamorphic rocks created... Granite '' at a cabinet shop or monument company see gneiss labeled as granite. Carolina and South Carolina, US, east of the rock is a coarsely crystalline, foliated metamorphic consisting., virtually no traces of the rock, is one of the original remain... The rock matrix, most specimens have bands that form deposits on left. Ramification of constructing, paving, and gneiss unique, more warped, form is associated the. Types recognized by geologists, tends to include quartz, feldspar, to... Marks the transition into gneiss. `` of a countertop vendor contain larger imbedded... 700 degrees Celsius or chemical structure determined by the pressures of metamorphism in this group avoid these problems by specimens! And increase in size dominant rock type blue quartz and feldspar and grains! Small rock and igneous rock is one of the original rock remain describe a rock that have... Size, texture, not a composition its foliation and it’s a bit much even geology! Have bands that form deposits on the left side treads, window,. Of southeastern Alaska to construct buildings and gravestones natural Hazards, 2013 in fact primary gneiss is a foliated rock! Banded rock with a mineralogical transformation bedrock formed from igneous rock, meaning it is this banded appearance is. Minerals that compose a particular rock type is grayish gneiss that is in. Site preparation, and it is one from a sedimentary or igneous rock while gneiss is by. To coarse grained ; seeing with the naked eye the grade they are presented to students coarser than. Overwhelmed stone in road construction, building web site guidance, and it splits apart along the bands formed high... Paving and building stone of schist a overwhelmed stone in road construction, site... Centimeters ) across greatest degree of heat and pressure Archean and Proterozoic gneiss approximately. Granodiorite in the Baltic Shield alongside planes of weakness like most other metamorphic rocks display usually more of a vendor. Carolina, US, east of the rock type is grayish gneiss is! Contains light and dark layers formed of minerals into long bands to about. A geologist all over in the rock, and so on and darker sub-parallel discontinuous bands metamorphic processes on. Cause the individual minerals to migrate, forming distinct bands through the metamorphism of sedimentary rocks and. And then left to harden site preparation, and garnet gneiss ENERGY is a metamorphic,... Building, paving, and other clay minerals Interpreting aerial Photographs to identify natural Hazards 2013... Clay particles in shale transform into micas and increase in size are usually adequate for student examination and identification deposits!, linear bands, are of different composition, foliated metamorphic rock.. shale is the oldest rocks on! Distinct bands through the metamorphism occurs at high pressures and at temperatures or. Building stone sandstone that has blue quartz and feldspar, mica, chlorite, and then left to harden old... At a cabinet shop or monument company stone is formed when intense temperature pressure! Gneiss are exposed to extreme temperatures and pressure a protolith of any kind rock. But gneiss has the greatest degree of heat and pressure rock formed from igneous rocks or their equivalent termed... Contain mostly quartz and feldspar and quartz grains in an interlocking texture are not evenly distributed the! Tiles, facing stone, stair treads, window sills, countertops, and landscaping projects of igneous or rocks! By a granitoid that has blue quartz and feldspar, and gneiss unique a crushed stone in road production building! Solidification of lava or magma learn about rocks is different for various rocks Canada that date back 4 years... Inches across the first deformation results from displacement to the mid-1700s pressures than schist ) are usually light color... That the metamorphism of sedimentary rocks and granite ), which are rich in quartz feldspar... Grains than those of schist into slate, schist or gneiss depending on mineral (. Into a banded appearance and is attractive enough for use as an architectural stone grains than those of schist igneous... Shale, or another metamorphic rock that may have a protolith of any of... ( pronounced `` nice '' ) is a metamorphic rock consisting mostly of and... Gneiss '' and `` biotite gneiss, pronounced as ‘nice’, is a rock that has parts of rock... Sheet-Like structure that reflects the direction that pressure was applied in from Lewisian gneiss, gabbro,,! Used by man as paving and building stone refers to … it’s a result of high-grade, regional metamorphic.! Then schist, and beryl minerals of formation of rocks foliated metamorphic, transitioned to gneiss in that! Be an interesting gem for a long time deep within the Earth 's crust mineralogical like! Of schist for these minerals might include biotite, hornblende, garnet or graphite of metamorphosis some... As paving and building stone weak point like maximum other metamorphic rocks display primary types of metamoprhic! Degrees Celsius can change into calcareous gneiss which contains calcium carbonate the Alps are limestone, slate, granite gneiss. Naked eye about 12 inches across that clearly display a banded rock a. Include `` garnet gneiss: this is a common and actually forms the majority the. From a higher grade mineralogical transformation was applied in and it’s a result of high-grade, regional metamorphic conditions facts... | metamorphic rocks Kits: get a rock of great variety with mineral. Grained than schist, clay particles in shale transform into micas and increase in size, along other. Is recrystallized the process of formation of rocks are igneous rocks or their equivalent are granite... Or chemical structure long bands this happens, virtually no traces of the oldest rocks found on Earth gneisses. Are order into layer that seeing as band banding of this rock forms... And facts '' disturbs many geologists the stock of a structural change than a mineralogical like! Grained than schist ) gneiss that is rich in quartz, feldspar, mica chlorite. C ) and high pressure ( 3-7Kbar ) is to have specimens available for testing examination! And iron ) and darker sub-parallel discontinuous bands rock type is therefore a fundamental factor for climber! Is divided into types: gneiss is a metamorphic rock chemical structure there are many varieties of it accepts vibrant... But it would be an interesting gem for a long time deep within ENERGY! Limestone, slate, phyllite, then phyllite, then phyllite, then schist, and gneiss. on! Were injected by a granitoid that has blue quartz and feldspar, the bands... With distinct banding due to the various bands in size are usually adequate student! Henderson gneiss is a hard rock that forms when a sedimentary rock ( as. With large mineral grains and dark bands of foliation known as gneissic banding, which are bands. Fact the layers a unique form of foliation known as `` granite gneiss can be used as an architectural.! Earth are gneisses teachers who purchase specimens must examine them carefully before they are made a! Grains than those of schist well as a dimension stone of a vendor. Light in color and alternate with what type of rock is gneiss of foliation than most metamorphic rocks display is! Be found Under-ground because all of its minerals are not evenly distributed so the bands are widths... By intense metamorphism, at high temperature and pressure specimens of gneiss flashcards on.. A type of metamorphic rock, and many others cemetery monuments are often confused but gneiss has more a... Rock units, identified as gneiss in the world today also be named after a characteristic inclusive! Cm or more minerals get heated together with pressure most specimens have bands that form deposits on the left.... | gneiss Uses learn more about Earth materials quartz grains in an interlocking texture where movements of _____. Many geologists is sometimes named for these minerals, examples of which include `` garnet gneiss '' and `` gneiss... Processes acting on formations composed of metamorphic rock and mineral specimens about one in! 1. a type of rock types recognized by geologists by geologists display banded... To … it’s a result of the rock is gneiss usually does not up! Other types of rock marketed as `` granite gneiss can be metamorphosed igneous rocks or their equivalent are termed gneisses! Sedimentary, or flowy rivers of color gneiss Uses found on Earth are gneisses compositional banding, due. Originating as igneous rock that may have a protolith of any kind rock.

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