pegmatitic definition
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Pegmatite A pegmatite is a holocrystalline, intrusive igneous rock composed of interlocking phaneritic crystals usually larger than 2.5 cm in size; such rocks are referred to as pegmatitic. The word pegmatite derives from Homeric Greek, πήγνυμι, which means “to bind together”, in reference to the intertwined crystals of quartz and feldspar in the texture known as graphic granite. Most pegmatites are composed of quartz, feldspar and mica, having a similar silicic composition as granite ...
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Pega Pega. Pega is a popular rules engine and BPM tool from Pega systems that is gaining good market share among large corporations. Architects and developers build the Pega/PRPC instance while administrators and even select business analysts have the option of changing workflow rules during runtime.
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Fractionalization Fractionalization can be understood as deconfinement of quasiparticles that together are viewed as comprising the elementary constituents. In the case of spin–charge separation, for example, the electron can be viewed as a bound state of a 'spinon' and a 'chargon', which under certain conditions can become free to move separately.
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- A pegis a fastener. A cynic is an important word referring to a person who isskeptical, or does not easily trust things that she is told. The boys discover the dead Poet's Society, founded by Mr. Keatingwhen he had been a student. They decide to reconvene this club. Mr. Keating was a hell raiser.
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In Finance, what is Pegging? Pegging is a practice which is used to increase market stability by fixing values relative to assets of stable value. A classic example is currency pegging, in which the value of a nation's currency is pegged to the value of another currency which is viewed as reliable and highly stable. Different nations take different stances on this practice and how heavily regulators can intervene in the market.
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Gneiss Gneissic rocks are usually medium-to coarse-foliated; they are largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc.neissic rocks are usually medium-to coarse-foliated; they are largely recrystallized but do not carry large quantities of micas, chlorite or other platy minerals. Gneisses that are metamorphosed igneous rocks or their equivalent are termed granite gneisses, diorite gneisses, etc.
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Pegmatite Pegmatite containing lepidolite, tourmaline, and quartz from the White Elephant Mine in the Black Hills, South Dakota. A pegmatite is a holocrystalline, intrusive igneous rock composed of interlocking phaneritic crystals usually larger than 2.5 cm in size; such rocks are referred to as pegmatitic.Most pegmatites are composed of quartz, feldspar and mica, having a similar basic composition as granite.he single feature that is diagnostic to all pegmatites is their large size crystal components. Pegmatite bodies are usually of minor size compared to typical intrusive rock bodies. Pegmatite body size is on the order of magnitude of one to a few hundred meters.
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clothes peg clothes peg (plural clothes pegs) (Britain, New Zealand) An object (usually made of wood) used to attach wet laundry to a clothesline so that it (the laundry) can dry.
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Definition Pemphigoid is a group of subepidermal, blistering autoimmune diseases that primarily affect the skin, especially the lower abdomen, groin, and flexor surfaces of the extremities. Here, autoantibodies (anti-BPA-2 and anti-BPA-1) are directed against the basal layer of the epidermis and mucosa.
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- melt composition within pegmatites, which includes a decrease of Mg and Sr and increase of Li, Rb, and Ba. The syn-orogenic pegmatites wereformedduring the crustalaccretionon the western marginof Fennoscandia under constant PTX-conditions causing the homogeneous trace element signature of quartz.
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Pegmatite To be called a pegmatite, a rock should be composed almost entirely of crystals that are at least one centimeter in diameter. The name pegmatite has nothing to do with the mineral composition of the rock. Most pegmatites have a composition that is similar to granite with abundant quartz, feldspar and mica.These are sometimes called granite pegmatites to indicate their mineralogical composition.he name pegmatite has nothing to do with the mineral composition of the rock. Most pegmatites have a composition that is similar to granite with abundant quartz, feldspar and mica. These are sometimes called granite pegmatites to indicate their mineralogical composition.
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intrusion The solidification of such injected magma leads to the formation of intrusive rock. (2) An intrusion is a geological body composed of igneous rock and formed in the process of injection and solidification of mag-matic melt in the earth’s crust (intrusion, intrusive body, plutonic intrusion).In relation to the structure of the country rock, intrusions are classified as concordant and discordant.he solidification of such injected magma leads to the formation of intrusive rock. (2) An intrusion is a geological body composed of igneous rock and formed in the process of injection and solidification of mag-matic melt in the earth’s crust (intrusion, intrusive body, plutonic intrusion).
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Pegging Market Insights » Glossary » Pegging. Currency pegging is fixing a currency’s exchange rate to that of another country. In an attempt to stabilise a country’s currency, a country’s government may create a fixed exchange rate, or a pegged exchange rate, to maintain the value of its currency. Pegging a currency provides benefits, such as minimising instabilities in economic activity, but can also cause problems with trade balance.
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- 162 LAW LIBRARY JOURNAL Vol. 105:2 [2013-7] Though it was the final stage in the procedure used to pass the ACA, the history of House bill 4872, or the HCERA, actually began at the same time the President and Democrats in Congress were making their initial moves on health care a year earlier.
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- mar·ca·site. Use marcasite in a sentence. an orthorhombic mineral, FeS, that is dimorphic with pyrite; iron sulfide. this mineral cut and mounted on silver or other white metal to look like brilliants.
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peg a peg to hang a claim upon. ( 1 cribbage) A peg moved on a crib board to keep score. ( 2 finance) A fixed exchange rate, where a currency 's value is matched to the value of another currency or measure such as gold. ( 3 Britain) A small quantity of a strong alcoholic beverage.eg ‎(third-person singular simple present pegs, present participle pegging, simple past and past participle pegged). 1  To fasten using a peg.
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gneiss gneiss (nīs), coarse-grained, imperfectly foliated, or layered, metamorphic rock rock, aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.
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- Biotite + plagioclase + quartz (BPQ) is a common assemblage in gneisses, metasediments and metamorphosed granitic to granodioritic intrusions. Melting experiments on an assemblage consisting of 24 vol.% quartz, 25 vol. % biotite (XMg = 0·38–0·40), 42 vol.iotite + plagioclase + quartz (BPQ) is a common assemblage in gneisses, metasediments and metamorphosed granitic to granodioritic intrusions. Melting experiments on an assemblage consisting of 24 vol.
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Granodiorite Granodiorite (/ˌɡraenɵˈdaɪ.ˌɡrænɵˈdaɪ/ ɵraɪt /or.ˌɡreɪnɵˈdaɪ/) ɵraɪt is a phaneritic texture intrusive igneous rock similar to, granite but containing more plagioclase feldspar than orthoclase. feldspar
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Pegmatite Pegmatite is an igneous rock composed almost entirely of crystals that are over one centimeter in diameter. The specimen shown here is about two inches (five centimeters) across. A crystal of imperial topaz on an allbite matrix from a pocket in the Katlang Pegmatite of Pakistan.
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EARTH SCIENCE LAB Igneous Rock Identification The texture of an igneous rock does not refer to the roughness or smoothness of the surface. Textures are based primarily on crystal size. Pegmatitic texture is composed of very large crystals (larger than 2-3 cm).
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- These large crystals give the rock coarse (granite) to very coarse (pegmatite) texture. Granite typically has crystals of from 1 to 10 mm in size while pegmatite's crystals can be 10mm (1cm) and very much larger (see ESRT).They are non-vesicular (no gas pockets). Both are FELSIC and low density.ranite & Pegmatite. Both granite and pegmatite are made from the same minerals (pink zone in chart). These are silicates including potassium and plagioclase feldspars, quartz, biotite and amphibole.
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- 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.It is primarily composed of quartz, sericite mica, and chlorite.mong foliated metamorphic rocks, it represents a gradation in the degree of metamorphism between slate and schist. The minute crystals of graphite, sericite, or chlorite, or the translucent fine-grained white mica, impart a silky, sometimes golden sheen to the surfaces of cleavage, called phyllitic luster.
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Reading: How Are Igneous Rocks Classified? Pegmatitic texture occurs during magma cooling when some minerals may grow so large that they become massive (the size ranges from a few centimetres to several metres). This is typical of pegmatites. Phaneritic (phaner = visible) textures are typical of intrusive igneous rocks, these rocks crystallized slowly below Earth's surface. As magma cools slowly the minerals have time to grow and form large crystals. The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye. Examples of phaneritic igneous rocks are gabbro, diorite and granite. Porphyritic textures develop when conditions during cooling of a magma change relatively quickly.
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- This large decorator specimen has greenish gold muscovite mica crystals perched on a light brown albite matrix. This beautiful pegmatite specimen is completely natural with no treatments of any kind. See also another view of this pegmatite decorator mineral specimen of muscovite on albite.
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dogmatistnoun  [ C] dogmatist meaning, definition, what is dogmatist: a person who believes too strongly that their personal opinions or beliefs are correct. Learn more.