nepheline syenite encyclopedia

nepheline-syenite Encyclopedia

2021-6-18  nepheline-syenite A medium- to coarse-grained igneous rock consisting of essential alkali feldspar (see ESSENTIAL MINERAL), nepheline, pyroxene (aegirine - augite or sodic hedenbergite) and amphibole (ferrohastingsite, NaCa 2 (Fe 2+) 4 AlAl 2 Di 6 O 22 (OH) 2, which is essentially a sodic, iron-rich hornblende, barkevikite and/or arfvedsonite) with accessory sphene, apatite, titanomagnetite,

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Nepheline Syenite - Encyclopedia

2021-7-3  Nepheline Syenite - Encyclopedia. GEOGRAPHICAL NAMES: NEPHELINE SYENITE, or Elaeolite-Syenite, a holocrystalline plutonic rock which consists largely of nepheline and alkali felspar. The rocks are mostly pale coloured, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. ...

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Nepheline Syenite Article about Nepheline Syenite by The ...

Nepheline syenite contains 50–56 percent SiO2, 19–24 percent Al 2 O 3, a small quantity of Ca and Mg, and 15–17 percent K and Na.

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Nepheline syenite rock Britannica

2021-9-1  Nepheline syenite, medium- to coarse-grained intrusive igneous rock, a member of the alkali-syenite group (see syenite) that consists largely of feldspar and nepheline. It is always considerably poorer in silica and richer in alkalies than granite.

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Nepheline syenite 37244-96-5 wiki - GuideChem

2016-3-29  Nepheline syenite CAS 37244-96-5 WIKI information includes physical and chemical properties, USES, security data, NMR spectroscopy, computational chemical data and more.

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Nepheline Syenite - an overview ScienceDirect Topics

Tina Christmann, Imma Oliveras, in Encyclopedia of the World's Biomes, 2020. Geology and soil. Campos de altitude are found on igneous and metamorphic substrates, mostly of Precambrian age such as granite rocks or Nepheline-syenite (Alves and Kolbek, 2010).Soils are highly acidic and nutrient-poor with soil types ranging from deep, organic mulls, moderately lateritic clays to rare moors ...

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Nepheline (Kola Peninsula) : Encyclopedia Arctica 10 ...

Nepheline (Kola Peninsula): Encyclopedia Arctica 10: Soviet North, Geography and General. Stefansson, Vilhjalmur, 1879-1962 Nepheline (Kola Peninsula) [ Unpaginated ] ... tions, of nepheline syenite containing strong alkalis and weak silicic acid and nepheline basalts.

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Nepheline Encyclopedia

2018-5-8  *nepheline* An important member of the feldspathoid group of silicate [1] minerals with composition Na3(Na,K)[Al4Si4O16], which approximates to NaAlSiO4 (with some K replacing Na); nepheline is an end-member [2] of the series with kalsilite [3] (KAlSiO4); sp. gr.

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l'Encyclopédie Canadienne - Home The Canadian

2006-2-7  La syénite à néphéline est une ROCHE IGNÉE de couleur blanche à gris pâle et à grains moyens. Elle est constituée surtout de FELDSPAR sodique, de néphéline, de feldspar potassique et de minéraux accessoires riches en magnésium et en fer.

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Nepheline syenite rock Britannica

2021-9-1  Nepheline syenite, medium- to coarse-grained intrusive igneous rock, a member of the alkali-syenite group (see syenite) that consists largely of feldspar and nepheline.It is always considerably poorer in silica and richer in alkalies than granite.The extraordinarily varied mineralogy of the nepheline

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Nepheline Syenite - an overview ScienceDirect Topics

Tina Christmann, Imma Oliveras, in Encyclopedia of the World's Biomes, 2020. Geology and soil. Campos de altitude are found on igneous and metamorphic substrates, mostly of Precambrian age such as granite rocks or Nepheline-syenite (Alves and Kolbek, 2010).Soils are highly acidic and nutrient-poor with soil types ranging from deep, organic mulls, moderately lateritic clays to rare moors ...

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Nepheline Encyclopedia

2018-5-8  *nepheline* An important member of the feldspathoid group of silicate [1] minerals with composition Na3(Na,K)[Al4Si4O16], which approximates to NaAlSiO4 (with some K replacing Na); nepheline is an end-member [2] of the series with kalsilite [3] (KAlSiO4); sp. gr.

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Nepheline (Kola Peninsula) : Encyclopedia Arctica 10 ...

Nepheline (Kola Peninsula): Encyclopedia Arctica 10: Soviet North, Geography and General. Stefansson, Vilhjalmur, 1879-1962 Nepheline (Kola Peninsula) [ Unpaginated ] ... tions, of nepheline syenite containing strong alkalis and weak silicic acid and nepheline basalts.

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Syenite rock - Encyclopedia Britannica

Syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral. A special group of alkali syenites is characterized by the presence of a feldspathoid mineral such as nepheline, leucite, cancrinite, or sodalite (see nepheline syenite

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nephelinite Encyclopedia

2021-6-17  nephelinite A fine-grained, often porphyritic, ultra-alkaline extrusive igneous rock consisting of essential titanaugite (see ESSENTIAL MINERAL), nepheline, and titanomagnetite, with accessory apatite, sphene, and perovskite (see ACCESSORY MINERAL). Where present, phenocrysts usually consist of the titanaugite, and occasionally nepheline.

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l'Encyclopédie Canadienne - Home The Canadian

2006-2-7  Syénite à néphéline. La syénite à néphéline est une ROCHE IGNÉE de couleur blanche à gris pâle et à grains moyens. Elle est constituée surtout de FELDSPAR sodique, de néphéline, de feldspar potassique et de minéraux accessoires riches en magnésium et en fer. L'industrie Canadienne de la syénite à néphéline débute en 1932 quand des concessions minières sont jalonnées à ...

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Feldspar and Syenites SpringerLink

2014-3-19  Syenite is a group of plutonic (or intrusive) rocks being rich on feldspars. In comparison to granites they contain less/no quartz. Commercially – apart from their use as dimensional stone – nepheline syenite is the most important member of that group used in ceramics, glass, and polymers. In ceramics and glass it is used like feldspar as a ...

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Alkaline rocks—undersaturated SpringerLink

Nepheline syenite. Nepheline syenite is a pale-colored, coarse-grained rock composed essentially of alkali feldspar (ca. 70%) and nepheline (ca. 20%) with minor proportions of dark minerals such as sodic pyroxene, sodic hornblende, or biotite; its volcanic equivalent is phonolite. It was first described from Foya (hence the original name ...

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nepheline-monzonite Encyclopedia

2021-6-21  essential, essential / iˈsenshəl/ • adj. 1. absolutely necessary; extremely important: it is essential to keep up-to-date records. ∎ fundamental or central to Norite, norite A coarse-grained, basic igneous rock consisting of essential plagioclase feldspar, orthopyroxene (hypersthene or bronzite), and clinopyroxene Levocarnitine, carnitine A derivative of the amino acid lysine ...

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Nepheline Syenite - an overview ScienceDirect Topics

Tina Christmann, Imma Oliveras, in Encyclopedia of the World's Biomes, 2020. Geology and soil. Campos de altitude are found on igneous and metamorphic substrates, mostly of Precambrian age such as granite rocks or Nepheline-syenite (Alves and Kolbek, 2010).Soils are highly acidic and nutrient-poor with soil types ranging from deep, organic mulls, moderately lateritic clays to rare moors ...

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Syenite rock - Encyclopedia Britannica

Syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral. A special group of alkali syenites is characterized by the presence of a feldspathoid mineral such as nepheline, leucite, cancrinite, or sodalite (see nepheline syenite

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Nepheline mineral - Encyclopedia Britannica

Nepheline, the most common feldspathoid mineral, an aluminosilicate of sodium and potassium [(Na,K)AlSiO4]. It is sometimes used as a substitute for feldspars in the manufacture of glass and ceramics. Nepheline is the characteristic mineral of alkaline plutonic rocks, particularly nepheline

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Nepheline Syenite - an overview ScienceDirect Topics

Wall and floor tiles: The most studied zeolites application is the substitution of conventional fluxes in sintered ceramic tiles.In fact, the main drawback correlated to the use of these materials—mainly potassic and sodic feldspars, but also nepheline syenite, talc, glasses, and glass-ceramic frits—is their high cost of supply and processing (milling and firing).

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nephelinite Encyclopedia

2021-6-17  nephelinite A fine-grained, often porphyritic, ultra-alkaline extrusive igneous rock consisting of essential titanaugite (see ESSENTIAL MINERAL), nepheline, and titanomagnetite, with accessory apatite, sphene, and perovskite (see ACCESSORY MINERAL). Where present, phenocrysts usually consist of the titanaugite, and occasionally nepheline.

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Nepheline - an overview ScienceDirect Topics

Robin Gill, in Encyclopedia of Geology (Second Edition), 2021. ... Photomicrograph taken in plane-polarized light of a nepheline syenite block from the Abrigo ignimbrite, Tenerife, Canary Islands, Spain, showing the products of late-stage interstitial crystallization. The wedge-shaped interstice is bounded by alkali feldspar (fsp), and is ...

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Feldspar and Syenites SpringerLink

2014-3-19  Syenite is a group of plutonic (or intrusive) rocks being rich on feldspars. In comparison to granites they contain less/no quartz. Commercially – apart from their use as dimensional stone – nepheline syenite is the most important member of that group used in ceramics, glass, and polymers. In ceramics and glass it is used like feldspar as a ...

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Alkaline rocks—undersaturated SpringerLink

Nepheline syenite. Nepheline syenite is a pale-colored, coarse-grained rock composed essentially of alkali feldspar (ca. 70%) and nepheline (ca. 20%) with minor proportions of dark minerals such as sodic pyroxene, sodic hornblende, or biotite; its volcanic equivalent is phonolite. It was first described from Foya (hence the original name ...

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nepheline-monzonite Encyclopedia

2021-6-21  essential, essential / iˈsenshəl/ • adj. 1. absolutely necessary; extremely important: it is essential to keep up-to-date records. ∎ fundamental or central to Norite, norite A coarse-grained, basic igneous rock consisting of essential plagioclase feldspar, orthopyroxene (hypersthene or bronzite), and clinopyroxene Levocarnitine, carnitine A derivative of the amino acid lysine ...

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Sodalite mineral - Encyclopedia Britannica

Sodalite, feldspathoid mineral, a chloride-containing sodium aluminosilicate that occurs with leucite and nepheline in such igneous rocks as nepheline syenite, trachyte, and phonolite.For chemical formula and detailed physical properties, see feldspathoid (table).. The sodalite

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