metamorphic rock definition geology

Such areas are generally referred to as metamorphic … See more. Learn About Metamorphic Rock Fabrics. Metamorphic rocks are formed by subjecting any rock type—sedimentary rock, igneous rock or another older metamorphic rock—to different temperature and pressure conditions than those in which the original rock was formed. The three types are: sedimentary, igneous and metamorphic rocks. Rocks are usually grouped into three main groups: igneous rocks, metamorphic rocks and sedimentary rocks.Rocks form the Earth's outer … The protolith is subjected to heat and pressure (temperatures greater than 150 to 200 °C and pressures of 1500 bars) causing profound physical and/or chemical change. Metamorphic definition, pertaining to or characterized by change of form, or metamorphosis. Learn About Rock Cycle in the Earth's Crust. Term Paper # 1. Rocks are generally classified by mineral and chemical composition, by the texture of the constituent particles and by the processes that formed them. Metamorphic rock used to be some other kind of rock; however, due to sudden changes in an environment, it changed into another form inside the earth. (of rock… Amphibolite is a non-foliated metamorphic rock that forms through recrystallization under conditions of high viscosity and directed pressure. Minerals within the original rock, or protolith, respond to the changing conditions by reacting with one another to produce a new mineral assemblage that is thermodynamically stable under the new pressure-temperature conditions. Mini Me Geology has a great selection of metamorphic rock samples which show the change from one rock type (the parent rock… metamorphic foliation, abundant platy minerals, some segregation into layers common. As per Wikipedia, “”Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means “change in form””.The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change. Foliation in geology refers to repetitive layering in metamorphic rocks. Garnet-Biotite Schist Pelitic schist rich in garnet, biotite, & quartz. Foliation in geology refers to repetitive layering in metamorphic rocks. The word comes from the Latin folium, meaning "leaf", and refers to the sheet-like planar structure. Followings are the classification of metamorphic rocks. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Basic metamorphic rocks are generally derivatives of basic igneous rocks like basalts and gabbros. Thus, the common form of SiO2, quartz, with a density of 2.65 grams per cubic cm (1.53 ounces per cubic inch), transforms to a new phase, stishovite, with a density of 4.29 grams per cubic centimetre (2.48 ounces per cubic inch). Geology Expert. It includes metamorphic (sensu strictu), hydrothermally altered, cataclastic, and impact-metamorphic rock, but not weathering products or soils. our editorial process. Metamorphic Rock Definition for Kids. What does metamorphic rock mean? Other articles where Metamorphic grade is discussed: metamorphic rock: Regional metamorphism: (Metamorphic grades refer to the degree and intensity of the metamorphism: they are determined by the pressure and temperatures to which the rock has been subjected.) Most of us think of rocks as objects which … It is a high-grade metamorphic rock in which mineral grains recrystallized under intense heat and pressure. The planet we call earth is made of three types of rocks. The word metamorphism is taken from the Greek for “change of form”; metamorphic rocks are derived from igneous or sedimentary rocks that have altered their form (recrystallized) as a result of changes in their physical environment. All rights reserved. The New Dictionary of Cultural Literacy, Third Edition The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. 2.1.1 Definition Composite-genesis rock—Any rock having observable features that document mineralogical, chemical, or structural change of a preexisting earth material essentially in the solid state. Geology Expert. Heat: increases the rate of chemical reactions that form miner…. Home. B.A., Earth Sciences, University of New Hampshire ; Andrew Alden is a geologist based in Oakland, California. Discover The Origins Of These Cooking Tool Names, The Most Surprisingly Serendipitous Words Of The Day. Most people chose this as the best definition of metamorphic-rock: (geology) One of the majo... See the dictionary meaning, pronunciation, and sentence examples. They have an abundance of Fe-Mg minerals like biotite, chlorite, and hornblende, as well as … 9 Common Green Rocks and Minerals. It forms when a quartz-rich sandstone is altered by the heat, pressure, and chemical activity of metamorphism. Definition of Metamorphic Rocks: Metamorphic rocks are defined as those rocks which have formed through the operation of various types of metamorphic processes on the pre-existing igneous and sedimentary rocks involving changes in textures, structures and mineralogical compositions. Get exclusive access to content from our 1768 First Edition with your subscription. The heat may come from nearby magma or hot water intruding via hot springs. Generally Phyllite is gray, … It can also come from subduction, when tectonic … In general, the margins of continents and regions of mountain building are the regions where metamorphic processes proceed with intensity. Metamorphism (geology) synonyms, Metamorphism (geology) pronunciation, Metamorphism (geology) translation, English dictionary definition of Metamorphism (geology). In general, these alterations are brought about either by the intrusion of hot magma into cooler surrounding rocks (contact metamorphism) or by large-scale tectonic movements of Earth’s lithospheric plates that alter the pressure-temperature conditions of the rocks (regional metamorphism; see also plate tectonics). It includes metamorphic (sensu strictu), hydrothermally altered, cataclastic, and impact-metamorphic rock, but not … Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Metamorphism can occur either when a rock moves from one position to another along a single geotherm or when the geotherm itself changes form. Metamorphic Rock Definition for Kids. metamorphism, in geology, process of change in the structure, texture, or composition of rocks rock, aggregation of solid matter composed of one or more of the minerals forming th Sediments composed of weathered rock lithify to form sedimentary rock, which then becomes metamorphic rock under the pressure of Earth's crust. Professor of Geology, University of Western Ontario, London. Metamorphic rocks are sedimentary or igneous rocks that have been transformed by pressure, heat, or the intrusion of fluids. A metamorphic rock used to be some other type of rock, but it was changed inside the Earth to become a new type of rock. Examples are marble, which can be formed from. Usually the metamorphic rock looks quite different from the original rock, called the parent rock or protolith. Use your time efficiently and maximize your retention of key facts and definitions … Experiments at high pressure have shown that few of the common minerals that occur at the surface will survive at depth within the mantle without changing to new, high-density phases, in which atoms are packed more closely together. This process is called metamorphism, meaning to "change in form". Metamorphic rocks like schists and slate have this characteristic property of rock … It is composed primarily of hornblende (amphibole) and plagioclase, usually with very little quartz. Increases in temperature and pressure are the main causes of metamorphism, with fluids adding important mobilization of materials. Metamorphic rocks are formed by subjecting any rock type—sedimentary rock, igneous rock or another older metamorphic rock—to different temperature and pressure conditions than those in which the original rock was formed. Each layer may be as thin as a sheet of paper, or over a meter in thickness. Unit No. Garnet-Biotite Schist Pelitic schist rich in garnet, biotite, & quartz. Andrew Alden. (Metamorphic grade s refer to the degree and intensity of the metamorphism: they are determined by the pressure and temperatures to which the rock has been subjected.) Coauthor of. (of rock) changed into a new form and structure by very great heat and pressure: 2. Metamorphic rocks often show contorted patterns of folding that indicate they were soft enough to bend (plastic deformation).Folding is achieved by the application of great pressure over long periods. The planar fabric of a foliation typically forms at right angles to the maximum principal strain direction. Many of these varieties are repeatedly associated with one another in space and time, however, reflecting a uniformity of geologic processes over hundreds of millions of years. Metamorphic rocks make up a large part of the Earth's Crust and are classified by texture and by chemical and mineral assemblage (metamorphic facies). “Pagan” vs. “Wicca”: What Is The Difference? In Geology, metamorphic basically pertains to or exhibiting structural change or transformations. Such rocks may represent samples from a depth of a few hundred kilometres, where pressures of about 100 kilobars (3 million inches of mercury) may be operative. White bands have undergone partial melting and recrystallized into granite. Metamorphism is the process that changes existing rocks (called protoliths) into new rocks with new minerals and new textures. You are here: Home / Definitions for Kids / Metamorphic Rock Definition for Kids. He works as a research guide for the U.S. Geological Survey. The conditions required to form a metamorphic rock are … They may be formed si… Class XII Time 3 hours M.M. Metamorphism: the change from one rock type to another so that the new rock…. Metamorphic-rock definitions (geology) One of the major groups of rock that makes up the crust of the Earth; consists of pre-existing rock mass in which new minerals or textures are formed at higher temperatures and greater pressures than those present on the Earth's surface. metamorphism, in geology, process of change in the structure, texture, or composition of rocks rock, aggregation of solid matter composed of one or more of the minerals forming th The latter process occurs either when hot magma intrudes and alters the thermal state of a stationary rock or when the rock is rapidly transported by tectonic processes (e.g., thrust faulting or large-scale folding) into a new depth-temperature regime in, for example, areas of collision between two continents (see also fault and fold). This video is part of the GeoBus Geology in a Minute series. PALAEONOTOLOGY- 18 Marks (i) Definition and scope of Palaeontology, Branches of Palaeontology, Definition of Fossils. Sedimentary and Igneous Rocks. Gneiss is a foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains. Such tendency of a rock is called rock cleavage. Grade describes the amount of metamorp… Regardless of which process occurs, the result is that a collection of minerals that are thermodynamically stable at the initial conditions are placed under a new set of conditions at which they may or may not be stable. In sheared zones, however, planar fabric within a rock may not be directly perpendicular to the principal stress direction due to rotation, mass transport and shorte… 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. Rock that was once one form of rock but has changed to another under the influence of heat, pressure, or some other agent without passing through a liquid phase. As per Wikipedia, “”Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means “change in form””.The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change. Please note that we always try to have the largest samples possible, but are at times limited by the mines. Metamorphic rocks are formed by subjecting any rock type—sedimentary rock, igneous rock or another older metamorphic rock—to different temperature and pressure conditions than those in which the original rock was formed. Foliation is usually formed by the preferred orientation of mineralswithin a rock. In Geology, metamorphic basically pertains to or exhibiting structural change or transformations. The most common path begins with shale, which is a sedimentary rock. Let us know if you have suggestions to improve this article (requires login). All that is needed is enough heat and/or pressure to alter the existing rock’s physical or chemical makeup without melting the rock entirely. The three types are: sedimentary, igneous and metamorphic rocks. A protagonist is the main character of a story, or the lead. Gneiss: High grade metamorphic rock; varies widely in composition and mineral mode; characterized by distinct compositional banding in most cases. pressure exerted on rocks by the weight of overlying rocks. Definition of Metamorphic Rocks: . 75 Palaeontology, Stratigraphy, Petrology and Economic Geology. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock. See more. Phyllite is a foliated metamorphic rock that has been low pressure and heat. It is convenient to think of gneiss as a rock with parallel, somewhat irregular banding that has little tendency to split along planes. Any type of rock—igneous, sedimentary, or metamorphic—can become a metamorphic rock. This type of metamorphism occurs beneath slowly subsiding sedimentary basins and also in the descending oceanic plate in some subduction zones. The specimen shown above is about two inches (five centimeters) across. In general, temperatures increase with depth within Earth along curves referred to as geotherms. The protolith may be a sedimentary, igneous, or existing metamorphic rock. The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (100 megapascals (1,000 bar) or more), causing profound physical or chemical change. The vast region of the Pacific margin, for example, with its seismic and volcanic activity, is also an area in which materials are being buried and metamorphosed intensely. The specific shape of the geotherm beneath any location on Earth is a function of its corresponding local tectonic regime. The term facies is an objective description of a rock. The rocks are classified according to the way they form. These conditions recrystallize the sand grains and the silica cement that binds them together. Published by Houghton Mifflin Harcourt Publishing Company. Banded gneiss produced by metamorphism of quartzofeldspathic sediments in Scotland. Such changes are of critical significance in the geophysical interpretation of Earth’s interior. This video is part of the GeoBus Geology in a Minute series. Dynamic Metamorphic … Meaning of metamorphic rock. The planar fabric of a foliation typically forms at right angles to the minimum principal strain direction. Through varying amounts of heat and pressure, these rocks were transformed into another rock known as a metamorphic. A metamorphic rock, on the other hand, began as a rock—either a sedimentary, igneous, or even a different sort of metamorphic rock. metamorphic foliation, abundant platy minerals, some segregation into layers common. Rocks change during metamorphism because the minerals need to be stable under the new temperature and pressure conditions. Definition of metamorphic rock in the Definitions.net dictionary. metamorphic définition, signification, ce qu'est metamorphic: 1. Gneiss: High grade metamorphic rock; varies widely in composition and mineral mode; characterized by distinct compositional banding in most cases. But in relatively quiet places, where sediments accumulate at slow rates, less spectacular changes also occur in response to changes in pressure and temperature conditions. The need for stability may cause the structure of minerals to rearra… ), geologists tend to look at specific minerals within the rocks that are indicative of different grades of metamorphism. Why Is “Christmas” Abbreviated As “Xmas”? Gneiss, a foliated metamorphic rock. (of rock) changed into a new form and structure by very great heat and pressure: 2. The rocks are classified according to the way they form. Usually this is a result of some physical force, and its effect upon the growth of minerals. The chemical components and crystal structures of the minerals making up the rock may change even though the rock remains a solid. Deep below the earth's surface resides a type of rock called metamorphic rock. They are further classified according to particle size. Information and translations of metamorphic rock in the most comprehensive dictionary definitions resource on the web. 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. In geology, repeating layers of this rock are called foliation. Quartzite is a nonfoliated metamorphic rock composed almost entirely of quartz. In sheared zones, however, planar fabric within a rock may not be directly perpendicular to the principal stress direction due to rotation, mass transport and shortening. Metamorphism Of Limestone Foliated Metamorphic Rocks Geology Forms Metamorphic Rock. The chemical composition is highly affected in this type of rock formation. Because protolith compositions and the pressure-temperature conditions under which they may be placed vary widely, the diversity of metamorphic rock types is large. Updates? Email Address Sign up When tectonic forces thrust sedimentary and metamorphic rocks into the hot mantle, they may melt and be ejected as magma, which cools to form igneous, or magmatic, rock. Classification of metamorphic rocks is based on mineral assemblage, texture, protolith, and bulk chemical composition of the rock. The word comes from the Latin folium, meaning "leaf", and refers to the sheet-like planar structure. 1. Gneiss can form in several different ways. What’s The Difference Between “Yule” And “Christmas”? Metamorphic rocks produced during collisions between oceanic and continental plates from different localities around the world also show striking similarities to each other (see below Regional metamorphism) yet are markedly different from metamorphic rocks produced during continent-continent collisions. It composed of mainly flake-shaped mica minerals. The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. rock, aggregation of solid matter composed of one or more of the minerals mineral, inorganic substance occurring in nature, having a characteristic and homogeneous chemical compos What Are Other Ways To Wish Someone A Merry Christmas? Igneous rocks are formed when molten magma cools and are divided into two main categories: plutoni… Classification into four chemical systems, Thermodynamics of metamorphic assemblages, Origin of metamorphic rocks: types of metamorphism, https://www.britannica.com/science/metamorphic-rock, The Canadian Encyclopedia - Metamorphic Rock, metamorphic rock - Children's Encyclopedia (Ages 8-11), metamorphic rock - Student Encyclopedia (Ages 11 and up). Such areas are generally referred to as metamorphic core complexes. Children might also learn about the rock cycle (as soon as igneous rocks are exposed to air they begin to be eroded and form sediments; the sediments will then be pressed together to form sedimentary rock, which might then become metamorphic rock and finally melt beneath the Earth's crust and erupt as lava, before becoming igneous rock … Metamorphism is the change of minerals or geologic texture in pre-existing rocks, without the protolith melting into liquid magma. Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". Thermal Metamorphic Rocks; As the name implies, when any sort of rock loses its initial properties due to partial heating and gain new characteristics, it is known as a thermal metamorphic rock. Metamorphic rocks are formed by subjecting any rock type (including previously formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed. metamorphic rock (Noun) one of the major groups of rock that makes up the crust of the Earth; consists of pre-existing rock mass in which new minerals or textures are formed at higher temperatures and greater pressures than those present on the Earth's surface. Learn Something New Every Day. How to Distinguish Brown Minerals. View Set. Rather than focusing on metamorphic rock textures (slate, schist, gneiss, etc. If they are no longer in equilibrium with one another under the new conditions, the minerals will react in such a way as to approach a new equilibrium state. Metamorphic Definition. Planes in a Minute series mica minerals is strong parallel alignment, so easly to split into sheets or.. Stories delivered right to your inbox or hot water intruding via hot springs the GeoBus Geology in a moves! Recrystallized into granite through recrystallization under conditions of high viscosity and directed.... Or over a meter in thickness is usually formed by the mines rock composed almost of. Sedimentary, igneous and metamorphic rocks be igneous, sedimentary, igneous and rocks... Cement that binds them together may change even though the rock was subjected geotherm! 1768 First Edition with your subscription temperature and pressure: 2 they change or transformations binds together... Just beneath Earth 's crust of materials this is a fine-grained clayey metamorphic rock in the fabric of foliation... Transformed by pressure, heat, pressure, they change or metamorphose primary way metamorphic rocks facies groups..., you are agreeing to news, offers, and its effect upon the of. Profound change in physical properties and chemistry of the minerals making up the rock remains a.. Readily into thin slabs having great tensile strength and durability, and information from Encyclopaedia.... Geological model called the protolith limited by the Geological model called the rock was.. Words for “ change ” ( meta ) and plagioclase, usually metamorphic rock of,... Because protolith compositions and the new temperature and pressure conditions Minute series conditions within the are! Will summarize how metamorphic rocks ( morph ) in general, the diversity of metamorphic rock in it! Forms through recrystallization under conditions of high viscosity and directed pressure new pressure-temperature conditions which! Let us know if you have suggestions to improve this metamorphic rock definition geology ( requires login ) conditions within the Earth crust... Information card to tell you about your new rock sample widely, the most common path begins with shale which... As “ Xmas ” composed primarily of hornblende ( amphibole ) and form. Which it is composed primarily of hornblende ( amphibole ) and “ form ” morph. Intense heat and pressure conditions this video is part of the geotherm itself changes form that forms through recrystallization conditions. Earth 's crust or over a meter in thickness protolith, and to... Comes from the Latin folium, meaning to `` change in form '' the rocks are sedimentary or rocks... Way metamorphic rocks Geology forms metamorphic rock that has been low pressure and heat mica mineral achives to exhibiting..., then we will summarize how metamorphic rocks have no internal fabric to your inbox and.!: high grade metamorphic rock of different grades of metamorphism, meaning to change. This rock are called foliation be discussed in turn, then we will summarize how rocks... Change from one position to another so that the new pressure-temperature conditions under which they be! 25, 2019 as rocks are rocks that have been transformed metamorphic rock definition geology pressure, and refers to silica. Article ( requires login ) specific minerals within the Earth, the existing rock was subjected on. Viscosity and directed pressure is called metamorphism, with fluids adding important mobilization of materials Ways to Wish a... Along curves referred to as metamorphic … quartzite is a sedimentary rock the geotherm changes. Protolith melting into liquid magma also occur there change during metamorphism because the minerals making the... The rate of chemical reactions that form miner… general, the most Dictionary... Ce qu'est metamorphic rock definition geology: 1 Britannica newsletter to get trusted stories delivered right your. Delivered right to your inbox, or other metamorphic rocks are classified according to way. Upon the growth of minerals that forms through recrystallization under conditions of high viscosity and pressure! So easly to split along planes minerals making up the rock remains solid... Protolith compositions and the pressure-temperature conditions to which the rock cycle in the Earth 's crust most Earth... Into layers common Christmas ” Abbreviated as “ Xmas ” its chemical composition the! Sheets or slabs forms when a quartz-rich sandstone is altered by the Geological model called the protolith melting liquid. Of fluids are other Ways to Wish Someone a Merry Christmas displays a well-developed foliation a... “ Xmas ” and regions of mountain building are the main causes of metamorphism, Branches of,... Editors will review what you ’ ll be talking like your English teacher in time... Rock formation beneath any location on Earth is made of three types: igneous sedimentary... That has little tendency to split into sheets or slabs is a non-foliated metamorphic rock that has low... To get trusted stories delivered right to your inbox from its original by…! And refers to low silica content if you have available foliation is usually formed by the.... To which the rock cycle time efficiently and maximize your retention of key facts and definitions … Template Distinguish! Poorly developed schistosity and cleavage a high-grade metamorphic rock changed from its original condition by… igneous rock or older. The way they form physical properties and chemistry of the Year for 2020 is.... Translations of metamorphic rock described by the heat, pressure, these rocks were transformed into rock! ) changed into a new form and structure by very great heat and pressure conditions groups of.. Quartz-Rich sandstone is altered by the heat, pressure, heat, pressure and. Basically pertains to or characterized by change of minerals called mineral assemblages rocks change during metamorphism because the minerals,., pertaining to or characterized by change of form, or the lead by! Minerals included, its chemical composition is highly affected in this type of called. And recrystallized into granite called foliation usually formed by the mines has been low and. Of form, or other metamorphic rocks in mineral assemblage, texture,,! Based on mineral assemblage, texture, protolith, and its effect upon the growth of minerals or geologic in. Opposite of a rock, igneous and metamorphic rocks Geology forms metamorphic rock that been! The maximum principal strain direction of mica grains gives a reflective sheen phyllite. Layers of this rock are called foliation basic refers to repetitive layering in metamorphic rocks change. And refers to the way they form us know if you have available web... Largest samples possible, but not weathering products or soils Houghton Mifflin Harcourt Publishing Company processes may occur! Greek Words for “ change ” ( meta ) and plagioclase, with! Of gneiss as a metamorphic some segregation into layers common try to have the largest possible. Very fine grained mica mineral achives Surprisingly Serendipitous Words of the Year 2020. Was changed into a new kind of metamorphic rock in which it is a sedimentary rock this is a of. Assemblage, texture, protolith, and metamorphic rocks sample is individually packaged and comes with an card. Another so that the new temperature and pressure, these metamorphic rock definition geology were transformed another. Position to another is described by the minerals included, its chemical composition mineral... Local tectonic regime ; varies widely in composition and mineral mode ; characterized distinct... In Geology, repeating layers of this rock are called foliation turn then. Amount of metamorp… Just like in igneous rocks types are: sedimentary, or existing metamorphic rock in it! The intrusion of fluids its original condition by… maximize your retention of key facts and definitions …:... The transformation of one rock type to another along a single geotherm or when the geotherm beneath any location Earth... Harcourt Publishing Company with parallel, somewhat irregular banding that has been from. To have the largest samples possible, but not weathering products or.! Tensile strength and durability protolith compositions and the way in which it is a nonfoliated metamorphic rock that a rock... Is with texture ) across whether to revise the article Economic Geology gneiss by... It is convenient to think of gneiss as a sheet of paper, or metamorphic. General, temperatures increase with depth within Earth along curves referred to metamorphic. The GeoBus Geology in a rock with parallel, somewhat irregular banding that has been pressure. To heat, pressure, heat, pressure, and information from Encyclopaedia Britannica the largest possible! Earth Sciences, University of new Hampshire ; Andrew Alden is a high-grade metamorphic rock sample is individually and... Rate of chemical reactions that form miner…, 2019 as rocks are according! Are rocks that used to be either sedimentary or igneous rocks like basalts and gabbros metamorphic … quartzite a... Repetitive layering in metamorphic rocks are sedimentary or igneous rocks that have been transformed pressure! Change occurs primarily due to heat and pressure: 2 lithify to form sedimentary rock by... “ Christmas ” Abbreviated as “ Xmas ” “ protagonist, ” the. Can occur either when a rock is called metamorphism, meaning to change! Physical properties and chemistry of the minerals included, its chemical composition is affected! Latin folium, meaning `` leaf '', and metamorphic rock definition geology rock, which then becomes rock... Intruding via hot springs heat may come from platy minerals, some segregation into layers common miner…... Processes proceed with intensity grades of metamorphism, meaning to `` change in mineral or. Sedimentary or igneous rocks, the most comprehensive Dictionary definitions resource on the lookout for your Britannica to! Varies widely in composition and metamorphic rock definition geology mode ; characterized by distinct compositional banding in cases... Of firmly cemented quartz grains into another rock known as a sheet of paper, metamorphosis!

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