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Encyclopedia > Feldspar
Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). Collected by Apollo 16 from the Lunar Highlands near Descartes Crater. This sample is currently on display at the National Museum of Natural History in Washington, DC.
Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). Collected by Apollo 16 from the Lunar Highlands near Descartes Crater. This sample is currently on display at the National Museum of Natural History in Washington, DC.

Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust.[1] Image File history File linksMetadata Download high resolution version (1200x1375, 270 KB) Summary Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). ... Image File history File linksMetadata Download high resolution version (1200x1375, 270 KB) Summary Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). ... Apparent magnitude: up to -12. ... Anorthosite is a phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90-100%), and a minimal mafic component (0-10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present. ... Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). ... Apollo 16 was the tenth manned mission in the Apollo program and the fifth mission to land on the Moon. ... Exploring Shorty crater during the Apollo 17 mission to the Moon. ... Descartes is a heavily-worn lunar crater that is located in the rugged south-central highlands of the Moon To the southwest is the Abulfeda crater. ... Inside the National Museum of Natural History, underneath the rotunda. ... Aerial photo (looking NW) of the Washington Monument and the White House in Washington, DC. Washington, D.C., officially the District of Columbia (also known as D.C.; Washington; the Nations Capital; the District; and, historically, the Federal City) is the capital city and administrative district of the United... A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition, a highly ordered atomic structure and specific physical properties. ... This article is about Earth as a planet. ... Earth cutaway from core to exosphere. ...


Feldspars crystallize from magma in both intrusive and extrusive rocks, and they can also occur as compact minerals, as veins, and are also present in many types of metamorphic rock.[2] Rock formed entirely of plagioclase feldspar (see below) is known as anorthosite. Feldspars are also found in many types of sedimentary rock. Quartz crystal Synthetic bismuth hopper crystal Insulin crystals Gallium, a metal that easily forms large single crystals A huge monocrystal of potassium dihydrogen phosphate grown from solution by Saint-Gobain for the megajoule laser of CEA. In chemistry and mineralogy, a crystal is a solid in which the constituent atoms... Magma is molten rock located beneath the surface of the Earth (or any other terrestrial planet), and which often collects in a magma chamber. ... Pluton redirects here. ... Extrusive refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff. ... Quartzite, a form of metamorphic rock, from the Museum of Geology at University of Tartu collection. ... Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). ... Anorthosite is a phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar (90-100%), and a minimal mafic component (0-10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present. ... Two types of sedimentary rock: limey shale overlaid by limestone. ...

Contents

Etymology

Feldspar is derived from the German Feld, field, and Spat, a rock that does not contain ore. "Feldspathic" refers to materials that contain feldspar. The alternative spelling, felspar, has now largely fallen out of use. This balancing rock, Steamboat Rock stands in Garden of the Gods park in Colorado Springs, CO The rocky side of a mountain creek near Orosí, Costa Rica. ... Iron ore (Banded iron formation) Manganese ore Lead ore Gold ore An ore is a volume of rock containing components or minerals in a mode of occurrence which renders it valuable for mining. ...


Compositions

Feldspar
Feldspar
Alkali feldspar perthite
Alkali feldspar perthite

This group of minerals consists of framework or tectosilicates. Compositions of major elements in common feldspars can be expressed in terms of three endmembers: Image File history File links Size of this preview: 698 × 600 pixelsFull resolution (2323 × 1996 pixel, file size: 782 KB, MIME type: image/jpeg) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Size of this preview: 698 × 600 pixelsFull resolution (2323 × 1996 pixel, file size: 782 KB, MIME type: image/jpeg) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Metadata Size of this preview: 800 × 599 pixelsFull resolution (2038 × 1527 pixel, file size: 434 KB, MIME type: image/jpeg) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Metadata Size of this preview: 800 × 599 pixelsFull resolution (2038 × 1527 pixel, file size: 434 KB, MIME type: image/jpeg) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... The silicate minerals make up the largest and most important class of rock-forming minerals. ... An endmember in mineralogy is a mineral that is at the extreme end of a mineral series. ...


K-feldspar endmember KAlSi3O8 General Name, Symbol, Number potassium, K, 19 Chemical series alkali metals Group, Period, Block 1, 4, s Appearance silvery white Standard atomic weight 39. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Standard atomic weight 26. ... General Name, Symbol, Number silicon, Si, 14 Chemical series metalloids Group, Period, Block 14, 3, p Appearance as coarse powder, dark grey with bluish tinge Standard atomic weight 28. ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ...


Albite endmember NaAlSi3O8 General Name, Symbol, Number sodium, Na, 11 Chemical series alkali metals Group, Period, Block 1, 3, s Appearance silvery white Standard atomic weight 22. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Standard atomic weight 26. ... General Name, Symbol, Number silicon, Si, 14 Chemical series metalloids Group, Period, Block 14, 3, p Appearance as coarse powder, dark grey with bluish tinge Standard atomic weight 28. ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ...


Anorthite endmember CaAl2Si2O8 General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Standard atomic weight 40. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Standard atomic weight 26. ... General Name, Symbol, Number silicon, Si, 14 Chemical series metalloids Group, Period, Block 14, 3, p Appearance as coarse powder, dark grey with bluish tinge Standard atomic weight 28. ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ...


Solid solutions between K-feldspar and albite are called alkali feldspar. Solid solutions between albite and anorthite are called plagioclase. Only limited solid solution occurs between K-feldspar and anorthite, and in the two other solid solutions, immiscibility occurs at temperatures common in the crust of the earth. Fig. ... Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). ...


Sanidine (monoclinic), orthoclase, and microcline (triclinic) refer to polymorphs of K-feldspar. Sanidine is stable at the highest temperatures, and microcline at the lowest. Perthite is a typical texture in alkali feldspar, due to exsolution of contrasting alkali feldspar compositions during cooling of an intermediate composition. The perthitic textures in the alkali feldspars of many granites are coarse enough to be visible to the naked eye. Sanidine is the high temperature form of potassium feldspar ((K,Na)(Si,Al)4O8) which occurs in felsic volcanic rocks such as rhyolite and trachyte. ... In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ... Orthoclase (KAlSi3O8) is an important tectosilicate mineral, which forms igneous rock. ... Microcline (KAlSi3O8) is an important igneous rock forming tectosilicate mineral. ... In crystallography, the triclinic crystal system is one of the 7 lattice point groups. ... Polymorphism in materials science is the ability of a solid material to exist in more than one form or crystal structure. ... A perthite is a structural (perthitic structure) variety of the potassium feldspars microcline and orthoclase (KAlSi3O8). ... A binary phase diagram displaying solid solutions over the full range of relative concentrations. ... A perthite is a structural (perthitic structure) variety of the potassium feldspars microcline and orthoclase (KAlSi3O8). ...

Labradorite
Labradorite

Compositions of the plagioclase series have been labeled as follows (percent anorthite in parentheses): Commons:Imagem:Labradorite detail. ... Commons:Imagem:Labradorite detail. ...

Intermediate compositions of plagioclase feldspar also may exsolve to two feldspars of contrasting composition during cooling, but diffusion is much slower than in alkali feldspar, and the resulting two-feldspar intergrowths typically are too fine-grained to be visible with optical microscopes. The immiscibility gaps in the plagioclase solid solution are complex compared to the gap in the alkali feldspars. The play of colors visible in some feldspar of labradorite composition is due to very fine-grained exsolution lamellae. Albite Albite is an alkali feldspar mineral. ... Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. ... Andesine is a feldspar mineral, a part of the plagioclase series. ... Labradorite, a feldspar mineral, is a member of the plagioclase series. ... Bytownite is a calcium rich member of the plagioclase solid solution series of feldspar minerals. ... Anorthite is one of the plagioclase feldspars, an important group of minerals abundant in the Earths crust. ... Fig. ...


Uses

Feldspar output in 2005[dubious – discuss]
Feldspar output in 2005[dubious ]

In 2005, Italy was the top producer of feldspar with almost one-fifth world share followed by Turkey, China and Thailand, reports the International Monetary Fund. Image File history File links Size of this preview: 800 × 351 pixelsFull resolution (1425 × 625 pixel, file size: 60 KB, MIME type: image/png)This bubble map shows the global distribution of feldspar output in 2005 as a percentage of the top producer (Italy - 3,000,000 tonnes). ... Image File history File links Size of this preview: 800 × 351 pixelsFull resolution (1425 × 625 pixel, file size: 60 KB, MIME type: image/png)This bubble map shows the global distribution of feldspar output in 2005 as a percentage of the top producer (Italy - 3,000,000 tonnes). ... Fixed Partial Denture, or Bridge The word ceramic is derived from the Greek word κεραμικός (keramikos). ... Thermoluminescence (TL) dating is the determination by means of measuring the accumulated radiation dose of the time elapsed since material containing crystalline minerals was either heated (lava, ceramics) or exposed to sunlight (sediments). ... Optical dating is a method of determining how long ago minerals were last exposed to daylight. ... Bon Ami, French for Good Friend, is a powdered household cleaner sold by the Faultless Starch/Bon Ami Company of Kansas City, Missouri, USA. The products slogan is Hasnt Scratched Yet referring to the fact that it does not scratch surfaces. ... This article needs additional references or sources to facilitate its verification. ...


References

  1. ^ Feldspar. What is Feldspar?. Industrial Minerals Association. Retrieved on July 18, 2007.
  2. ^ "Metamorphic Rocks." Metamorphic Rocks Information. Retrieved on July 18, 2007.

is the 199th day of the year (200th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... is the 199th day of the year (200th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ...

See also


  Results from FactBites:
 
AllRefer.com - feldspar, Mineral (Mineralogy And Crystallography) - Encyclopedia (342 words)
Feldspar is found in association with all rock types, including granite, gneiss, basalt, and other crystalline rocks, and are essential constituents of most igneous rocks.
Feldspars weather to yield a large part of the clay found in soils.
Feldspar crystals are either monoclinic or triclinic (see crystal), and all show clean cleavage planes in two directions.
THE FELDSPAR GROUP OF MINERALS (446 words)
The feldspars are a group of minerals that have similar characteristics due to a similar structure.
The plagioclase feldspars are a set of minerals that are in a series from a sodium rich end member, albite, to a calcium rich end member, anorthite.
Once identified, however, some feldspar mineral varieties are found to have distinctive characteristics or originate from a classic locality and on these bases are recognized by mineral collectors as belonging to a specific feldspar mineral.
  More results at FactBites »

 
 

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