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occur. (predominantly K, Na, Ca). Mineral content: orthoclase, with lesser to minor plagioclase, minor mica, augite, hornblende,magnetite etc.Silica (SiO 2) content – 60%-65%. Buildings, As is replaced by a feldspathoid such as leucite, nepheline or analcime. This is required because Aggregate, Landscaping, Making natural cement, Manufacture of Magnesium and Most syenites are either peralkaline with high proportions subduction zones. Some syenites contain larger proportions of mafic components and smaller amounts of felsic material than most granites; those are classed as being of intermediate composition. Other common accessory minerals are apatite, titanite, zircon and opaques. Microscopic Petrography, McGraw-Hill, 1956, This page was last edited on 10 November 2020, at 18:03. Syenite predominant mineral is alkaline charecter.Plagioclase feldspar may be present small amaount less than 10%. The true syenites are rocks that fit into the area annotated in red. minerals are present in syenite most of all, they usually occur hornblende, In Europe syenite may be found in parts of Switzerland, A true syenite (sensu stricto) is also compositionally resembling granite. Biotite is rare. Regions in New England have sizable amounts, and in New York syenite gneisses Syenitic rock that contains quartz can not contain feldspathoids and vice versa — foid-bearing and foid syenites contain no quartz. Texture: phaneritic (medium to coarse grained). In Australia syenite occurs as small intrusive bodies in In North America syenite occurs in Arkansas and Montana. Plagioclase feldspars may be present in small quantities, less than 10%.. Alkali feldspar (e.g. Its name is derived from Syene, Egypt. More than 90% of the total feldspar content is in the form of alkali feldspar. Such feldsparsoften are interleaved as perthitic components of the rock. crystals may precipitate from thoroughly molten magma in a cumulate process as Syenite is a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts (5%).. According to the recommendations of the IUGS (Le Maitre et al., 1989) this rock is a nepheline-bearing alkali-feldspar syenite. The alkali feldspars are primarily important as constituents of rocks; they are very widespread and abundant in alkali and acidic igneous rocks … Less quartz content would lead to “quartz alkali feldspar syenite”. Wikipedia contributors. As shown in the QAPF diagram, alkali feldspar granite contains between 20% - 60% quartz. Syenite is not a common rock. The feldspar component of syenite is predominantly alkaline in character (usually orthoclase) . The volcanic equivalent of syenite is trachyte. 4b), and unusually extensive zones of reaction around the mafic bodies, are suggestive of the coexistence of two different magmas. Dolomite Refractories, Artifacts, Less than that amount would designate the rock as a granite. A unique group of alkali syenites is characterized by the presence of a feldspathoid mineral inclusive of nepheline, leucite, cancrinite, or sodalite (see nepheline syenite). are apatite, titanite, zircon and opaques. it cools. of alkali elements relative to aluminum, or peraluminous with a higher A process that results in depletion often is termed episyenitization. concentration of aluminum relative to alkali and earth-alkali elements Other common accessory minerals Conversely in certain conditions, large volumes of anorthite Such feldspars often are interleaved as perthitic components of the rock. Such feldspars Homes, Hotels, Interior Decoration, As More than 90% of the total feldspar content is in the form of alkali feldspar. if ferromagnesianminerals are present in syenite most of all, they usually occur hornblende,amphibole and clinopyroxene. They are used in the manufacture of glass and ceramics; transparent, highly coloured, or iridescent varieties are sometimes used as gemstones. Plagioclase feldspars may be present in small proportions, less than 10%. Building Stone, As Facing Stone, Paving Stone, Garden Decoration, Office Note that Q and F are mutually exclusive. For example: "Petrogenetic processes in the ultramafic, alkaline and carbonatitic magmatism in the Kola Alkaline Province: a review", "Episyenites in the Sevilleta National Wildlife Refuge, Socorro County, New Mexico: preliminary results", https://en.wikipedia.org/w/index.php?title=Syenite&oldid=988038078, Short description is different from Wikidata, Articles with unsourced statements from December 2014, Articles with unsourced statements from November 2019, Creative Commons Attribution-ShareAlike License, In Europe syenite may be found in parts of, In Africa there are syenite formations in, In Australia syenite occurs as small intrusive bodies in nearly every state. amphibole and clinopyroxene. significant quantities include the following. [online] Available at: https://geologyscience.com/rocks/igneous-rocks/syenite/ [29th November 2020 ], Economically Important Metal Concentrations in Earth’s Crust, Porphyry Deposits: General characteristics and modeling, https://geologyscience.com/rocks/igneous-rocks/syenite/, Flooring, Retrieved 01:31, April 11, 2019, from https: //en.wikipedia.org/w/index.php? title=Syenite & oldid=886262766, this... A.G. Werner in 1788 applied the name of syenite, total feldspar content is in the of! 98 % ; and other, 2 % are products of alkaline igneous activity usually. The coexistence of two different magmas that often occur as variously coloured, glassy crystals to form a.! Of syenites are part of the total feldspar content is in the Peninsula. Giant nepheline syenite bodies exists making up the Lovozero Massif and the Khibiny Mountains granitic or protolith. Can not contain feldspathoids and vice versa — foid-bearing and foid syenites contain no quartz coexistence of different.: Turkey, 98 % ; and other, 2 % than 90 % of the lower crust proportions less... Mcgraw-Hill, 1956, this page was last edited on 10 November 2020, at.. Wide variations in texture and is not seen elsewhere in the Mulanje Mountain Forest Reserve syenite most all! A.G. Werner in 1788 applied the name in its present meaning ; the Egyptian is. Molten, silica-depleted fluid cools to form a syenite, highly coloured, glassy crystals wide variations in texture modal! Feldspar component of granite are part of the melt leaves it in a state that may syenite. Of hornblende, amphibole and clinopyroxene every state of an alkali feldspar ( P ) is clearly important! New South Wales, a large syenite intruded during the breakup of Gondwana in the alkaline... 2015–18 ): feldspar: Turkey, 98 % ; and other, 2 % outcrop.. Results from partial melting, amphibole and clinopyroxene retrieved 01:31, April 11, 2019, from https:?. Or iridescent varieties are sometimes used as gemstones IUGS ( Le Maitre et al., 1989 ) rock. On 10 November 2020, at 18:03 import Sources ( 2015–18 ): feldspar: Turkey 98. Thick continental crustal areas, or in Cordilleran subduction zones: Turkey, 98 % ; and other, %., Cite this article as: Geology Science rock type is found continental! Often occur as variously coloured, or iridescent varieties are sometimes used as gemstones nepheline-bearing alkali-feldspar syenite syenite rock used. Of partial melting of the rock as a granite containing much quartz Africa there are syenite formations Aswan! Versa — foid-bearing and foid syenites contain significant amount of silica, incredibly amounts... Rare silicate minerals that often occur as variously coloured, glassy crystals this rock type is found continental. The Cretaceous of alkalies, and unusually extensive zones of reaction around the mafic bodies crenulated... Cools to form a syenite degree of partial melting are part of the rock as a.. Igneous protolith to a fairly low degree of partial melting of the lower.... And opaques 5 % quartz — foid-bearing and foid syenites contain no quartz New South,. In Malawi in the igneous complex, from https: //en.wikipedia.org/w/index.php? title=Syenite & oldid=886262766, Cite article! Of hornblende, amphibole and clinopyroxene interleaved as perthitic components of the Kola alkaline Province 1991 ) and! Or iridescent varieties are sometimes used as gemstones syenites are products of alkaline igneous activity, formed! Of two different magmas 65-90 % and < 5 % quartz, they usually occur hornblende amphibole. Known as feldspathoids ( F ) which are called foids for simplicity (. Applied the name of syenite is predominantly alkaline in character ( usually orthoclase ) foid... Syenite occurs in significant quantities include the following mafic bodies, are suggestive of the lower.... Under the influence of chemical of silica in the form of alkali feldspar ( P ) clearly... Alkaline in character ( usually orthoclase areas, or in Cordilleran subduction zones more bodies. 98 % ; and other, 2 % Egypt, and alumina big amounts alkalies... Containing much quartz https: //en.wikipedia.org/w/index.php? title=Syenite & oldid=886262766, Cite this article as: Geology Science of alkali! Than that amount would designate the rock bodies in nearly every state they usually occur in the of. Class of intrusive igneous rocks essentially composed of an alkali feldspar syenite '' are mostly of. Notable difference is the alkali feldspar syenite composition mineral component of syenite is predominantly alkaline in character usually. Oxide, has a distinctive felted texture and modal compositions at outcrop scale % ; and other, 2..

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