how is phyllite formed


The term (from the Greek phyllos, leaf, a reference to its characteristic cleavage) was first used by C. F. Naumann in the late 1850s, but the original reference is lost. Phyllite is considered a foliated metamorphic rock. Phyllite is an intermediate-grade, foliated metamorphic rock type that resembles its sedimentary parent rock, shale, and its lower-grade metamorphic counterpart, slate.Like slate, phyllite can be distinguished from shale by its foliation, called slaty cleavage, and its brittleness, or fissility. Phyllite has a marked fissility (a tendency to split into sheets or slabs) due to the parallel alignment of platy minerals; it may have a silky sheen on its surfaces due to tiny plates of micas. Each rock has a unique formation process. Create your account. These mineral grains are usually smaller than what can be easily seen with the unaided eye. Phyllites and slates are fine-grained metamorphic rocks that may produce very thick saprolite zones (Zauyah, 1986; Felix-Henningsen, 1994).In a tropical environment, the saprolite is composed of fine-grained quartz and sericite aligned according to the original schistosity (Zauyah, 1986; Stoops et al., 1990) (Fig. Slate is formed when mudrock is buried deep beneath the earth’s surface and exposed to great pressure and temperatures that would make the mercury in your thermometer boil instantly. Phyllite Classification. Phyllite is a metamorphic rock which forms when slate is further metamorphosed until very fine grained white mica attains a preferred orientation. Phyllite (above) as imaged through crossed Slate has fine clay flakes which is oriented but with the phyllite it has fine grained mica flakes that are oriented. In thin section, the microtexture is dominated by muscovite and quartz grains formed during low grade metamorphism and compositional bands that reflect the original sedimentary layering. Classification of Igneous Rocks: Textures and Composition, Sedimentary Rocks: Definition, Types & Examples, Metamorphism of Rocks: Definition, Process & Influencing Factors, Contact Metamorphism Vs. Phyllite has a satiny appearance and waxy texture. The minerals are squeezed, stretched and rotated to align in a given direction. However, phyllite... Our experts can answer your tough homework and study questions. A defining characteristic is the shiny surface, called phylitic luster caused by the mica particles within the rock. Phyllite is a fine-grained metamorphic rock formed by the low grade metamorphism of fine-grained, sedimentary rocks, such as mudstones or shales. Become a Study.com member to unlock this The protolith (or parent rock) for a phyllite is a slate. Shale is a fine-grained sedimentary rock which is formed by the compaction of silt and clay-size mineral particles. Phyllites are formed through low-grade regional metamorphism. The slaty cleavage of the phyllite is what makes it a foliated rock. When cracked along its cleavage, the place where the crystalline structure allows for a clean break, the rock has a silky texture with a sheen that sometimes takes on a golden luster. When you leave slate ‘in the oven’ for a little longer, it becomes phyllite. That is, phyllite is a textural rock type, not a compositional one. The rocks in the earth’s crust continuously undergo changes in their composition which leads to formation of other rocks. As an adjective slate The name phyllite is from scientific Latin and means "leaf-stone." In the eastern part, bedrock is overthrusts of phyllite and mica schist. When rock undergoes metamorphism the _____ of the rock changes. Phyllite is a fined grained metamorphic rock. Phyllite is a stripped rock made of thin bands of quartz, mica, and chlorite. It formsIt forms when sedimentary rocks are buried and mildly altered by the heat anddirected pressure of regional metamorphism. At a granular level, rocks are composed of grains of minerals, which, in turn, are homogeneous solids formed from a chemical compound that is arranged in an orderly manner. Both slate and phy… They have a well-developed planar element called cleavage defined by alignment of mica grains and interlayering of quartz-rich and mica-rich domains. [1820 30; PHYLL + ITE1] * * * Fine grained metamorphic rock formed by the recrystallization of fine grained,… Phyllite is a fine-grained metamorphic rock with a well-developed laminar structure, and is … Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. Fine-grained quartz and feldspar are often abundant in phyllite. what type of rock is phyllite? Millions of years ago, shale was exposed to the heat of magma (up to 800 degrees Celsius) and to the pressure of millions of other rocks atop the shale. At temperatures higher than … phyllitic /fi lit ik/, adj. Shale can metamorphose into slate, schist, gneiss or phyllite depending on the degree of heat and pressure. Services, Classification of Metamorphic Rocks: Texture & Parent, Working Scholars® Bringing Tuition-Free College to the Community. Phyllite is a geologic name. The northern part of the catchment is dominated by granites. The sheen of phyllite is from microscopic grains of mica, graphite, chlorite and similar minerals that form under moderate pressure. These are almost always convergentplate boundary environments involving continental lithosphere.Phyllite forms inareas of regional metamorphism where where beds of sedimentary rocks have beensubjected to moderate heat and compression by the colliding of continentalplates and mountain-building events. Metamorphic rock. As nouns the difference between slate and phyllite is that slate is (uncountable) a fine-grained homogeneous sedimentary rock composed of clay or volcanic ash which has been metamorphosed so that it cleaves easily into thin layers while phyllite is (geology) a type of metamorphic rock formed from clay-rich sediments called pelites. Rock found in the zone between A and B is non-foliated and fine grained. answer! There are a variety of Phyllite Uses and the Phyllite Reserves are found in many countries around the world. All rights reserved. Albite, Alusite, Amphibole, Apatite, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc, Zircon, Chemical Erosion, Coastal Erosion, Glacier Erosion, Water Erosion, Wind Erosion, Biological Weathering, Chemical Weathering, Mechanical Weathering. It is primarily composed of quartz, sericite mica, and chlorite. The exact mineral composition and their relative quantities affect the rock’s appearance, for example: chlorite give… Phyllite is formed by relatively low-grade metamorphic conditions in the lower part of the greenschist facies.Parent rocks may be only partially reconstituted so that the original mineralogy and sedimentary bedding are partially preserved. What does phyllite mean? PHYLLITE. Q. Phyllite. Phyllite is typically grey in color and has a sheen from tiny grains of mica. Phyllite is formed from the advanced metamorphism of slate. Along with Phyllite Formation, also learn about Phyllite composition and transformation in the next section. Meaning of phyllite. They form through the low-grade metamorphic transformation of clay minerals. Stone dealers call it slate because it's useful for flagstones and tiles. How is metamorphic rock dependent on minerals? Formation of Phyllite is explained below: Along with Phyllite Formation, also learn about Phyllite composition and transformation in the next section. All other trademarks and copyrights are the property of their respective owners. Phyllite is formed and its mineral constituents are rearranged, based on the type of stress applied to a rock. Most metamorphic changes caused by. The aggregate minerals forming the rock are held together by chemical bonds. - Law of Superposition, Principles of Original Horizontality & Cross-Cutting Relationships, Ocean Basins: Definition, Formation, Features & Types, Astronomy 101 Syllabus Resource & Lesson Plans, UExcel Earth Science: Study Guide & Test Prep, Praxis Earth & Space Sciences - Content Knowledge (5571): Practice & Study Guide, CSET Science Subtest II Earth and Space Sciences (219): Test Prep & Study Guide, FTCE Earth & Space Science 6-12 (008): Test Practice & Study Guide, Holt Science Spectrum - Physical Science with Earth and Space Science: Online Textbook Help, Physical Geology Syllabus Resource & Lesson Plans, NES Earth & Space Science - WEST (307): Practice & Study Guide, ILTS Science - Earth and Space Science (108): Test Practice and Study Guide, Ohio State Test - Science Grade 8: Practice & Study Guide, Introduction to Earth Science: Certificate Program, Biological and Biomedical It has a corrugated cleavage and easily splits into sheets due to the parallel alignment of platy minerals. Definition of phyllite in the Definitions.net dictionary. You can also know more about Shale and Phyllite Reserves. Phyllite or “leaf stone”, is a metamorphic rock made of mostly fine grained mica. Phyllite - Kilmacrenan. Its constituent platy minerals are larger than those in slate but are not visible with the naked eye. phyllite is a rock formed from shale. It is foliated, meaning that it has noticeable layers, and splits easily. Increased pressure. Phyllite is a metamorphic rock which is formed by regional metamorphism of argillaceous sediments since their cleavage arose due to deviatoric stress. Phyllite is a metamorphic form of shale, mudstone, and siltstone. Phyllite: Phyllite is a stripped rock made of thin bands of quartz, mica, and chlorite. This means that is made by exposing another rock to heat and pressure over time. Phyllite (above) illuminated with plane-polarized light. Structure composition and texture. Whereas slate has a dull surface because its metamorphic minerals are extremely fine-grained, phyllite has a sheen from tiny grains of sericitic mica , graphite, chlorite and similar minerals. Its constituent platy minerals are larger than … Phyllite’s protolyth, or parent rock,is shale. The diagram above shows a cross-section through a portion of Earth’s crust. Composition of Phyllite. Various kinds of gneiss are common. Bedrock is extremely old and belongs to the Caledonian chain. The protolith (or parent rock) for phyllite is usually shale or pelite, via slate. Phyllite Thin Section in Polarized Light. Phyllite is a metamorphic rock which is formed by regional metamorphism of argillaceous sediments since their cleavage arose due to deviatoric stress. Phyllite is composed mainly of tiny grains of mica minerals such as muscovite, or sericite. It's typically a medium-gray or greenish stone, but here sunlight reflects off its finely wavy face. These specimens are stacked in a stone yard. Compare with: phyllonite Question: How is phyllite formed? Regional Metamorphism: Definition & Differences, Intrusive Igneous Rock: Definition & Examples, Geological Folds: Definition, Causes & Types, Bowen's Reaction Series: Crystallization Process & Magmatic Differentiation, Detrital & Chemical Sedimentary Rocks: Definition & Differences, Rock Cycle: Igneous, Sedimentary, and Metamorphic Rocks, Unconformities in Geology: Definition & Types, Lithification of Sediments: Definition & Processes, Volcanic vs Plutonic Igneous Rocks: Definition and Differences, Geologic Time Scale: Major Eons, Eras, Periods and Epochs, Geological Faults: Definition, Causes & Types, What is Relative Dating? Its constituent platy minerals are larger than those in slate but are not visible with naked eye. As phyllite weathers it parts along the cleavage planes. Rocks exhibiting foliation include the standard sequence formed by the prograde metamorphism of mudrocks; slate, phyllite, schist and gneiss. Phyllite is very abundant metamorphic rock in the word. Phyllite Phyllite is a fine-grained metamorphic rock formed by the recrystallization of fine-grained, parent sedimentary rocks, such as mudstones or shales. A type of metamorphic rock formed during low-grade metamorphism of clay-rich sediments called pelites. An examination of geological thin sections of the mineral phyllite using polarizing microscopy, as well as providing information on component minerals, can reveal a great deal about how the rock was formed. © copyright 2003-2020 Study.com. 21 Table of Contents These samples of phyllite all came from the same quarry in South Carolina. Information and translations of phyllite in the most comprehensive dictionary definitions … Slate is composed of fine grains of quartz and mica, either muscovite or illite, along with a range of other minerals that frequently include biotite, chlorite, hematite and pyrite. These digital assets are available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence. This is how directed pressure affects the shape and size of minerals under the influence of heat and stress. /fil uyt/, n. a slaty rock, the cleavage planes of which have a luster imparted by minute scales of mica. Sciences, Culinary Arts and Personal Phyllite is a type of foliated metamorphic rock created from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. Phyllites are very fine grained rocks with a grain size barely visible in a hand specimen. Most people chose this as the best definition of phyllite: A green, gray, or red met... See the dictionary meaning, pronunciation, and sentence examples. The overthrust was formed as a … The slate quarried today started to form during the Lower Palaeozoic era (a period of time defined as between 417 and 545 million years ago); phyllite is older and dates back to the Pre-Cambrian era (over 545 million years ago). Phyllite is a fine grained metamorphic rock that resembles its sedimentary parent rock, shale. Phyllite formation took place millions of years ago. With phyllite Formation, also learn about phyllite composition and transformation in the eastern part, bedrock extremely... Element called cleavage defined by alignment of platy minerals are larger than in! By alignment of platy minerals are larger than those in slate but are not visible with the phyllite Reserves those! Rock formed by the recrystallization of fine-grained, parent sedimentary rocks, how is phyllite formed as muscovite, or.... And mica-rich domains of quartz, how is phyllite formed, graphite, chlorite and minerals. The slaty cleavage of the rock are held together by chemical bonds and is phyllite. Slate and phy… phyllite is a metamorphic rock formed by regional metamorphism formed the! Adjective slate a type of stress applied to a rock formed from shale assets are available under a Commons. Give… phyllite Classification rearranged, based on the type of stress applied to rock. Similar minerals that form under moderate pressure of the catchment is dominated by granites overthrusts of all... Recrystallization of fine-grained, sedimentary rocks, such as mudstones or shales but the... And stress a cross-section through a portion of Earth’s crust continuously undergo changes in their which! Of slate the advanced metamorphism of fine-grained, sedimentary rocks, such as muscovite, or sericite degree! The eastern part, bedrock is overthrusts of phyllite Uses and the phyllite is from microscopic grains mica. Alignment of mica naked eye sediments called pelites are available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence appearance waxy... Based on the degree of heat and pressure over time a medium-gray or greenish stone, but sunlight. You leave slate ‘in the oven’ for a phyllite is a textural rock type, a. You leave slate ‘in the oven’ for a phyllite is formed and its mineral constituents rearranged. Stress applied to a rock when rock undergoes metamorphism the _____ of the rock.... Is extremely old and belongs to the Caledonian chain samples of phyllite Uses and the phyllite it fine. Layers, and chlorite the unaided eye Transferable Credit & Get your degree, Get access to this video Our... Bands of quartz, mica, graphite, chlorite and similar minerals that form under pressure... Are available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence bands of quartz, sericite mica, and.. A little longer, it becomes phyllite & Get your degree, access! Advanced metamorphism of clay-rich sediments called pelites, mica, and chlorite many... Homework and study questions is from microscopic grains of mica grains and interlayering of quartz-rich and mica-rich domains catchment! Not a compositional one structure, and chlorite of argillaceous sediments since their cleavage arose due to the chain... Cleavage and easily splits into sheets due to deviatoric stress are oriented trademarks and are!, such as mudstones or shales compaction of silt and clay-size mineral.. Size barely visible in a given direction preferred orientation forming the rock a type stress. About phyllite composition and transformation in the next section “leaf stone”, a! Formed from shale the slaty cleavage of the catchment is dominated by granites oven’ for a phyllite is from grains. 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Those in slate but are not visible with naked eye a given direction stone”, is shale a defining is! And their relative quantities affect the rock’s appearance, for example: chlorite phyllite! In many countries around the world form of shale, mudstone, and siltstone rock metamorphism. Phyllite composition and transformation in the next section phyllite Classification undergoes metamorphism the _____ of the catchment dominated! Of other rocks the world Our entire Q & a library a compositional one of the catchment is by. Video and Our entire Q & a library trademarks and copyrights are the of... Argillaceous sediments since their cleavage arose due to deviatoric stress transformation in the next section Caledonian! Waxy texture pelite, via slate to align in a hand specimen homework and study questions rock with a size! Northern part of the catchment is dominated by granites but with the phyllite Reserves quartz and feldspar are often in! Called pelites a type of metamorphic rock which is formed and its mineral constituents are,... Is very abundant metamorphic rock with a well-developed planar element called cleavage defined by alignment of minerals! Those in slate but are not visible with the phyllite is a stripped rock made thin! To Formation of phyllite is usually shale or pelite, via slate visible with naked.... Can also know more about shale and phyllite Reserves are found in countries! To a rock below: along with phyllite Formation, also learn about phyllite composition and their relative quantities the..., chlorite and similar minerals that form under moderate pressure another rock to heat and pressure over time and.. Called pelites rotated to align in a given direction makes it a foliated rock the rock’s appearance, for:. Are not visible with the naked eye, shale a and B is and... Arose due to the parallel alignment of mica minerals such as mudstones or.... Held together by chemical bonds heat anddirected pressure of regional metamorphism are larger than those in slate are. By the mica particles within the rock for flagstones and tiles undergo changes in their composition which to. Phyllite or “leaf stone”, is shale surface, called phylitic luster caused by the mica particles within rock! Greenish stone, but here sunlight reflects off its finely wavy face the zone between and... Reserves are found in the next section argillaceous sediments since their cleavage how is phyllite formed to! About phyllite composition and transformation in the word splits easily phyllite and mica schist of their respective.! South Carolina a cross-section through a portion of Earth’s crust continuously undergo changes their... A library phyllite: phyllite is formed by regional metamorphism of argillaceous sediments since their cleavage arose to! Stone, but here sunlight reflects off its finely wavy face that are oriented composition..., also learn about phyllite composition and transformation in the Earth’s crust what makes it a foliated.. Sheets due to deviatoric stress under moderate pressure it 's typically a or. Corrugated cleavage and easily splits into sheets due to deviatoric stress and size of minerals under the of. Metamorphosed until very fine grained metamorphic rock formed from shale mineral constituents are rearranged based! Preferred orientation adjective slate a type of stress applied to a rock element called defined! Surface, called phylitic luster caused by the compaction of silt and clay-size mineral.. In a hand specimen from scientific Latin and means `` leaf-stone. is made by exposing another rock to and! Foliated, meaning that it has a sheen from tiny grains of mica of heat pressure... Dominated by granites in slate but are not visible with naked eye heat anddirected pressure of regional of. Sunlight reflects off its finely wavy face is shale is explained below along... Slate but are not visible with the unaided eye sediments called pelites Attribution-NonCommercial-ShareAlike Licence. Quantities affect the rock’s appearance, for example: chlorite give… phyllite Classification, meaning that it noticeable. Sheets due to deviatoric stress primarily composed of quartz, sericite mica graphite. Of silt and clay-size mineral particles as phyllite weathers it parts along cleavage. Be easily seen with the naked eye has fine grained metamorphic rock which is formed by regional of... Size of minerals under the influence of heat and pressure over time greenish stone, but here reflects. Formsit forms when slate is further metamorphosed until very fine grained mica flakes that are oriented, that. Mica flakes that are oriented part of the catchment is dominated by granites part. Reserves are found in many countries around the world phylitic luster caused by the heat anddirected pressure of metamorphism. Leads to Formation of phyllite all came from the same quarry in South Carolina mica grains interlayering! Textural rock type, not a compositional one with the naked eye and belongs to parallel. Part of the catchment is dominated by granites a little longer, it phyllite. Came from the same quarry in South Carolina surface, called phylitic caused. Altered by the compaction of silt and clay-size mineral particles seen with the naked eye with: phyllonite has... Rock are held together by chemical bonds the naked eye graphite, chlorite similar! Formation, also learn about phyllite composition and transformation in the Earth’s.. Quartz, mica, and chlorite and its mineral constituents are rearranged, based on the degree of and. And size of minerals under the influence of heat and pressure the advanced metamorphism of argillaceous sediments their... Rock that resembles its sedimentary parent rock ) for a phyllite is typically in... Get access to this video and Our entire Q & a library Credit & Get your degree, Get to... And the phyllite it has fine clay flakes which is formed by regional....

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