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University of Minnesota's Mineral Pages: Potassium Feldspar

Within the potassium feldspar group, the occurrence of each potassium feldspar member varies slightly. Orthoclase is the most common potassium feldspar, forming the majority of potassium feldspar found in felsic plutonic igneous rocks, some high temperature .

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Feldspar | Encyclopedia

feldspar (fĕl´spär, fĕld´–) or felspar (fĕl´spär), an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.

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Feldspar - the Gem and Mineral

Some moonstones represent the more valuable feldspar gems and these are thought by some to bring good fortune. Another gemstone found in the feldspar group is known as sunstone. Sunstone a variety of the usually white albite feldspar; however, the sunstone variety will be reddish to a shiny, golden feldspar with adularescence.

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Plagioclase Feldspar | Physical-Optical Properties ...

Plagioclase feldspar group minerals are the most common rock-forming minerals. They are importantly dominant minerals in most igneous rock. They are major constituents in a wide range of intrusive and extrusive igneous rocks including granite, diorite, gabbro, rhyolite, andesite, and basalt.

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What is Feldspar? - Industrial Minerals Association ...

Feldspar is by far the most abundant group of minerals in the earth's crust, forming about 60% of terrestrial rocks. Most deposits offer sodium feldspar as well as potassium feldspar and mixed feldspars. Feldspars are primarily used in industrial applications for their alumina and alkali content.

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Gallery of Feldspars - thoughtco

Feldspars are a group of closely related minerals that together make up the majority of the Earth's crust. All of them have a hardness of 6 on the Mohs scale, so any glassy mineral that's softer than quartz and cannot be scratched with a knife is very likely to be a feldspar.

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Feldspar - Wikipedia

Feldspars (K Al Si 3 O 8 – Na Al Si 3 O 8 – Ca Al 2 Si 2 O 8) are a group o rock-furmin tectosilicate meenerals that mak up as much as 60% o the Yird's crust.. Feldspars crystallize frae magma as veins in baith intrusive an extrusive igneous rocks an are an aa present in mony types o metamorphic rock. Rock furmed almaist entirely o calcic plagioclase feldspar is kent as anorthosite.

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Feldspar mineral - ScienceDaily

Oct 13, 2016 · Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in .

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Chapter 3 Minerals Flashcards | Quizlet

Start studying Chapter 3 Minerals. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. ... a group of feldspar minerals. ... -a group of rock-forming silicate minerals composed of single chains of silicon-oxygen tetrahedra. Compare with amphibole, which is .

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Feldspar mineral family - Gemstone's Information

Feldspar gets its name from the German word "Feldspath" and related to the German word for rock. Feldspar, sometimes written as felspar, is the name for a group of silicate minerals that makes up the greatest percentage (almost 60%) of minerals found in the Earth's surface (in fact, if the entire composition of the earth's crust were regarded as a single mineral, it would calculate out almost ...

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Geology - rocks and minerals - University of Auckland

Introduction Properties Common rock-forming minerals Economic minerals. Orthoclase Orthoclase is a member of the feldspar group (like plagioclase) and is a framework silicate. Orthoclase, also known as alkali feldspar or K-feldspar, is one end-member of a solid solution between orthoclase and albite. ...

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Feldspar - Wikipedia

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 veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known ...

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Feldspar - sandatlas

Feldspar is the most abundant mineral group in the Earth's crust.There are more feldspars (60%) than all the other minerals combined in the outer (13-17) km of the crust 1.Feldspars occur in most igneous and metamorphic rocks.

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Plagioclase Feldspar: A group of common rock ... - Geology

"Plagioclase" is the name of a group of feldspar minerals that form a solid solution series ranging from pure albite, Na(AlSi 3 O 8), to pure anorthite, Ca(Al 2 Si 2 O 8). Minerals in this series are a homogenous mixture of albite and anorthite.

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Feldspar Facts for Kids - Kiddle encyclopedia

Feldspar is the name of a group of rock-forming minerals that make up as much as 60% of the Earth's crust.. Feldspar forms crystals from magma in both intrusive and extrusive rocks, and they can also happen as compact minerals, as veins, and are also present in many types of metamorphic rock.Rock formed entirely of plagioclase feldspar is known as anorthosite.

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Feldspar - Wikipedia

The name feldspar derives from the German Feldspat, a compound of the words Feld, "field", and Spat meaning "a rock that does not contain ore". The change from Spat to -spar was influenced by the English word spar, meaning a non-opaque mineral with good cleavage. Feldspathic refers to materials that contain feldspar. The alternate spelling, felspar, has fallen out of use.

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Feldspar

Why is feldspar important? The feldspars are a family of silicate minerals which occur in igneous rocks. There are many different members to the feldspar group. Obviously, silicon and oxygen form the foundation for the group, but calcium, sodium, and potassium are also present. One of these elements is usually dominant, but most of the ...

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What mineral group is Feldspar - answers

Feldspar is a mineral that is found in igneous rocks. Potassium feldspar is one of the minerals in granite, while plagioclase feldspar is found in andesitic rock.

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Feldspar Group - Mindat

Feldspar Group. Rock Corral, Mineral Mts, Beaver Co., Utah, USA. A plate of Feldspar measuring 4" by 5" by 3/4" thick from the Rock Corral collecting area near Milford, Ut. Most collectors come to search for the Smokey Quartz and Garnet, this one was just too nice to leave. Notice the two tiny Smokey Quartz embedded in the Feldspar.

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Feldspar | Minerals Education Coalition