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plagioclase feldspar uses

Ground into powder, plagioclases are also used in the manufacture of paints, rubber, glass, plastics, and are even used as a mild cleaning abrasive. Plagioclase is a mixture of albite (Ab), or sodium aluminosilicate (NaAlSi3O8), and anorthite (An), or calcium aluminosilicate (CaAl2Si2O8); the two intermingle and form a continuous chemical range (called a solid-solution series) between albite and anorthite (the end-members of the series). …the alkali feldspars and the plagioclase feldspars. Most of the crystals of the members of this series exhibit microscopic, repeated lamellar albite twinning; this produces the fine parallel striations observed on some surfaces. Premium Membership is now 50% off! With a Mohs hardness of 6 and perfect cleavage, these stones are usually considered to be too fragile for use in jewelry. Alkali feldspars are more commonly used commercially than plagioclase feldspars. Flint (the…. The alkali feldspars include orthoclase, microcline, sanidine, anorthoclase, and the two-phase intermixtures called perthite. They are major constituents in a wide range of intrusive and extrusive igneous rocks including granite, diorite, gabbro, rhyolite, andesite, and basalt. The role of silica is that of a filler, used to impart “green” (that is,…, Whitewares are often referred to as triaxial bodies, owing to the three mineral types—clay, silica, and feldspar—consistently found in their makeup. The feldspar-rich rocks larvikite and a few anorthosites are employed as both interior and exterior facing slabs. Premium Membership is now 50% off. Transparent material of high quality is also cut into faceted gemstones which are often sold as collector gems. Spectrolite is a trade name for labradorite with strong colour flashes. Indirectly, the feldspar group provides some crucial resources that form as feldspars weather and break down. … It may also have a sparkle owing to inclusions of hematite, in which case it is called sunstone. Plagioclase minerals are important constituents of many metamorphic rocks, such as gneiss, where they can be inherited from an igneous protolith or formed during the regional metamorphism of sedimentary rocks. Feldspars are used widely in the glass and ceramics industries. The feldspar-rich rocks larvikite and a few anorthosites are employed as both interior and exterior facing slabs. Sunstone (oligoclase or orthoclase) is typically yellow to orange to brown with a golden sheen; this effect appears to be due to reflections from inclusions of red hematite. It is usually added as quartz sand, sandstone, or flint pebbles. Other constituents of traditional ceramics are silica and feldspar. Uses of Feldspar ┗ Feldspar contains alumina, which results in an increase in the strength of the manufactured product. Our editors will review what you’ve submitted and determine whether to revise the article. It indicates that the rocks cooled quickly after their eruption. In the early 21st century Turkey led the world in feldspar production. Sanidine is also diagnostic of high-temperature contact metamorphism as an indicator of sanidinite hornfels or facies. Oligoclase, the most common plagioclase, occurs in granite, diorite, and other felsic igneous rocks and in some metamorphic rocks; notable occurrences … This was first shown by the German mineralogist Johann Friedrich Christian Hessel (1796–1872) in 1826. Plagioclase is a series of tectosilicate (framework silicate) minerals within the feldspar group. Plagioclase refers to a series of silicate minerals in which the amount of sodium (Na) and calcium (Ca) varies. Feldspars (K Al Si 3 O 8 – Na Al Si 3 O 8 – Ca Al 2 Si 2 O 8) are a group of rock-forming tectosilicate minerals that make up about 41% of the Earth's continental crust by weight.. Feldspars crystallize from magma as both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. In this section. However, the old plagioclases names are still used in petrology for classification of rocks. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... A scanning-electron-microscope photograph of pyroxene and plagioclase crystals (the long and the short crystals, respectively) that grew in a cavity in a fragment of Moon rock gathered during the Apollo 14 mission. Albite is found commonly in granites, syenites, rhyolites, and trachytes. In addition, several feldspars are used as gemstones. Clay is the plastic component, giving shaping abilities to the unfired product and also serving as a glass former during firing. Black Friday Sale! Let us know if you have suggestions to improve this article (requires login). Plagioclase minerals are rarely found in transparent crystals of exceptional clarity. Plagioclase, any member of the series of abundant feldspar minerals usually occurring as light-coloured, glassy, transparent to translucent, brittle crystals. The plagioclase series follows (with percent anorthite in parentheses): Albite (0 to 10) NaAlSi3O8, Oligoclase (10 to 30) (Na,Ca)(Al,Si)AlSi2O8, Andesine (30 to 50) NaAlSi3O8—CaAl2Si2O8, Labradorite (50 to 70) (Ca,Na)Al(Al,Si)Si2O8, Bytownite (70 to 90) (NaSi,CaAl)AlSi2O8, Anorthite (90 to 100) CaAl2Si2O8.. Production and Uses of Feldspar Minerals Three varieties have gemstone uses: Labradorite, Moonstone, and Sunstone. Therefore, this mineral is used … Omissions? The chemical formulas vary from Na(AlSi3O8) to Ca(Al2Si2O8). The primary importance of plagioclase, however, derives from its role in rock formation. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The chemical formulas vary from Na(AlSi3O8) to Ca(Al2Si2O8). Feldspars are used widely in the glass and ceramics industries. It is also common in low-grade metamorphic rocks ranging from zeolite to greenschist facies. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Albite, or soda spar as it is known commercially, is used in ceramics. In contrast, andesine is rare except in andesites and diorites. Strictly speaking,…, …are composed of hornblende and plagioclase. The primary importance of plagioclase, however, derives from its role in rock formation. Certain feldspars are somewhat less common. Updates? The rarest plagioclase is bytownite, which occurs in basic igneous rocks and in stony meteorites. Anorthite is found only in gabbros, though it is common in certain high-grade metamorphic rocks such as granulite facies. Intermediate members are homogeneous mixtures of the pure end-members. Labradorite is often iridescent. Uses. Microcline, also found in granitic rocks and pegmatites, is present in sedimentary rocks such as sandstones and conglomerates. Black Friday Sale! Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The plagioclase feldspars are triclinic. It can also occur in metamorphic rocks. The discarded plagioclase feldspars include oligoclase (10-30% of albite), andesine (30-50%), labradorite (50-70%) and bytownite (70-90%). Alkali feldspars are more commonly used commercially than plagioclase feldspars. Plagioclase is used in the manufacture of glass and ceramics; the iridescent varieties peristerite and labradorite are valued as gemstones or ornamental material. Feldspar also has a host of other end-uses which include urethane, mild abrasives, paints, welding of red coating, production of steel and latex foam. Sanidine occurs as phenocrysts (large noticeable crystals) in extrusive felsic igneous rocks such as rhyolite and trachyte. The plagioclase feldspars include members of the albite-anorthite solid-solution series. ┗ It is used as a filler agent for plastic, rubber, and paint. It may also occur in some metamorphic pelitic schists and gneisses. This article was most recently revised and updated by, https://www.britannica.com/science/plagioclase, University of Wisconsin-Extension - Plagioclase. The chemical formulas vary from Na(AlSi3O8) to Ca(Al2Si2O8). Corrections? Well-formed crystals are prized by mineral specimen collectors because of their beauty and rarity. Oligoclase, the most common plagioclase, occurs in granite, diorite, and other felsic igneous rocks and in some metamorphic rocks; notable occurrences are at Aust-Agder, Norway, and Fine, New York, United States. Oligoclase is characteristic of granodiorites and monzonites. Albite, or soda spar as it is known commercially, is used in ceramics. Other uses of Potassium Feldspar Weathered potassium feldspars disintegrate into clay minerals and aluminum ores, both of which are important resources used in today’s society.

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