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Topic: Anorthite

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	V-4 (Site not responding. Last check: 2007-09-15)
		Anorthite containing 19 percent aluminum and 20 percent silicon can be concentrated from some highland soils where it is present in amounts up to 60 percent.
		Anorthite can be considered to be a potential aluminum ore in the sense that it is a naturally occurring concentration of aluminum from which it may be economically feasible to extract the metal.
		This relationship is shown in figure 1, where the available anorthite concentrate is plotted against the agglutinate content for the soils in table 1.
	lifesci3.arc.nasa.gov /spacesettlement/spaceres/V-4.html (5452 words)

	V-5 (Site not responding. Last check: 2007-09-15)
		The chemical composition of anorthite is compared with the usual clays and bauxite resources of Earth in table 1.
		The major difference between anorthite and other minerals is the calcium content, which might prove to be a considerable problem in the extraction of aluminum.
		The only processes known on Earth for the beneficia-tion of anorthite is the soda-lime sintering process (developed by the Bureau of Mines), which was tested both in the laboratory and by pilot plant operation (ref.
	lifesci3.arc.nasa.gov /Spacesettlement/spaceres/V-5.html (6067 words)

	Dislocation and diffusion creep of synthetic anorthite aggregates (Site not responding. Last check: 2007-09-15)
		Synthetic fine-grained anorthite aggregates were deformed at 300 MPa confining pressure in a Paterson-type gas deformation apparatus.
		The data show that the strengths of anorthite aggregates decrease with increasing water content in both the dislocation and diffusion creep regimes.
		A comparison of the creep data of synthetic plagioclase from this study with published data for feldspar, olivine and quartz indicates a linear relationship between activation energy and log A similar to the suggested compensation law for diffusion in silicates.
	www.gfz-potsdam.de /pb3/pg32/projects/feldspat.html (321 words)

	PERMANENT - Lunar Materials - Minerals
		For example, the lunar highlands mineral "anorthite" is similar to the ore "bauxite" from which aluminum is produced on Earth.
		Alternatively, anorthite could be processed to produce ceramics like "calcia" (CaO, aka "lime") and "alumina" (Al) instead of the metals, or silica glasses with various properties depending upon the metal oxides existing in the final glass product and any other impurities added.
		They concluded that the cost of extracting aluminum from anorthite was within a factor of 2 of the cost of extracting aluminum from bauxite and would become even more competitive as the cost of bauxite increased [with depletion].
	www.permanent.com /l-minera.htm (1874 words)

	An amorphous phase on the anorthite Hugoniot (Site not responding. Last check: 2007-09-15)
		Compressional wave velocities as a function of pressure have been measured in pressure-amorphized anorthite to 14 GPa at room temp.
		assemblages which have been suggested as high-pressure phases of anorthite are shown to possess zero-pressure bulk sound speeds in the range 6.9 km s-1 to 8.1 km s-1, well above the value of 5 km s-1 extrapolated from the shock-wave data.
		It is therefore proposed that the shock Hugoniot of anorthite above 30 GPa represents the properties of the pressure-amorphized phase, rather than those of the equil.
	mrsec.uchicago.edu /Publications/Heinz/heinz003.html (156 words)

	Lang American Minerologist Garnet Images (Site not responding. Last check: 2007-09-15)
		Note the reds in the high-anorthite plagioclase inclusions in the core, the greens and blues of plagioclase inclusions in the inclusion-rich intermediate region, and the lower anorthite plagioclase outside the garnet.
		All of the plagioclase inclusions are normally zoned with higher anorthite in their cores and lower anorthite in the rims.
		Both the core and rim of the uppermost plagioclase inclusion are warmer colors, indicating higher anorthite content.
	www.geo.wvu.edu /~lang/ammin_garnet.html (427 words)

	ANORTHITE (Calcium Aluminum Silicate)
		Anorthite is an end member and one of the rarer members of the plagioclase series.
		Anorthite by definition must contain no more than 10% sodium and no less than 90% calcium in the sodium/calcium position in the crystal structure.
		Anorthite is usually found in contact metamorphic limestones and as a constituent in mafic igneous rocks.
	mineral.galleries.com /minerals/silicate/anorthit/anorthit.htm (342 words)

	anorthite -- Encyclopædia Britannica (Site not responding. Last check: 2007-09-15)
		Primarily a rock-forming mineral, it is used in the manufacture of glass and ceramics.
		Anorthite occurs in basic igneous rocks, as at Trentino, Italy; Södermanland, Swed.; Tamil Nadu, India; Miyake, Japan; and Franklin, N.J. For detailed physical properties, see feldspar…;
		Anorthite occurs in basic igneous rocks, as at Trentino, Italy; Södermanland, Swed.; Tamil Nadu, India; Miyake, Japan; and Franklin, N.J. For detailed physical...
	www.britannica.com /eb/article-9007713?tocId=9007713 (453 words)

	ORIGIN OF COEXISTING PLAGIOCLASES (ANDESINE-ANORTHITE) IN THE BOEHLS BUTTE ANORTHOSITE, NORTHERN IDAHO
		Hypotheses proposed for its origin include (1) metasomatic alteration of sedimentary or igneous rocks; (2) subsolidus exsolution, shear differentiation or metamorphic coarsening of intermediate plagioclase, and; (3) magmatic crystallization, inclusion of metasedimentary restite and hydrothermal alteration; each of these hypotheses is problematic.
		CL petrography further supports interpretation of anorthite grains as the foci of retrograde fluid flow.
		Experimental studies by Orville (1972) and others have noted the rapid anorthitization of more-sodic plag at high T in the presence of a Ca-bearing brine, where altered plag may retain its shape, twin boundaries, etc. A similar reaction is invoked to explain the unusual textural and isotopic characteristics of the BBA.
	gsa.confex.com /gsa/2003AM/finalprogram/abstract_67864.htm (484 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		X-ray microanalysis confirmed the composition of the glass films to be close to that of anorthite (CaO{center_dot}Al{sup 2}O{sub 3}{center_dot}2SiO{sub 2}).
		Although anorthite usually has triclinic symmetry, subsequent crystallization of these films in air at 1200 C resulted in the formation of pseudo-orthorhombic CaAl{sub 2}Si{sub 2}O{sub 8} (o-anorthite), a known metastable form of the mineral.
		The dislocation network observed at the o-anorthite/Al{sub 2}O{sub 3} interface indicates that nucleation and growth of the anorthite occurs directly on the substrate surface without an intervening interfacial amorphous layer.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=316019 (322 words)

	Solid Solution Phase Diagram
		Low temperature, sodic plagioclase (Albite) is on the left; high temperature calcic plagioclase (anorthite) is on the right.
		A 30% anorthite has 30% calcium and 70% sodium.
		The solidus and liquidus lines are experimental, they have been determined by melting and cooling many melts at different percents anorthite.
	darkwing.uoregon.edu /~jrice/geol_311/SolidSol.html (728 words)

	ANORTHITE - Online Information article about ANORTHITE
		Anorthite is an essential constituent of many basic igneous rocks, such as See also:
		Japan, but are usually rare at other localities.
		The name anorthite was given to the Vesuvian mineral by G. See also:
	encyclopedia.jrank.org /ANC_APO/ANORTHITE.html (333 words)

	Solid Solution Phase Diagram
		NOTE that anorthite crystallizes at a much higher temperature than albite, just what we expect from Bowen's reaction series.
		Imagine a plagioclase crystal which is 50 % anorthite (50% Ca and 50% Na).
		We could, of course, separate the melt from the unmelted crystal at any time during the process before the last bit of crystal melts, and fractionated the system.
	csmres.jmu.edu /geollab/Fichter/IgnRx/SolidSol.html (1120 words)

	anorthite - Wiktionary
		Anorthite is very rare on Earth, but abundant in moon rocks.
		This is because Anorthite weathers rapidly to clay minerals under atmospheric conditions.
		Good crystals have been found in lava-digested limestone blocks erupted from Mount Vesuvius.
	en.wiktionary.org /wiki/Anorthite (116 words)

	[No title]
		This sample shows a nice plagioclase feldspar absorption feature near 1.2 µm, but the 2.0-µm band and bands longer than about 2.3 µm are due to water from a contaminant.
		Comment: A moderate intensity reflection at 2.783 anstroms is in the position of the anorthite (221) but is anomalously strong.
		Comment: A moderate intensity reflection at 2.783 angstroms is in the position of the anorthite (221) but is anomalously strong.
	speclab.cr.usgs.gov /spectral.lib04/DESCRIPT/bytownite.HS106.3B.html (232 words)

	Lecture 8 Phase Diagrams
		At eutectic, both diopside and anorthite crystallize in eutectic proportions.
		When all melt is gone, have crystals of diopside and anorthite in proportions the same as the bulk composition.
		Once last bit of anorthite has melted, still have diopside, T can rise again.
	www.ac.wwu.edu /~debari/406/Lec6to9.htm (1054 words)

	The plagioclase feldspar anorthite
		Anorthite belongs to the Plagioclase Feldspar group, an
		Anorthite is a rare Feldspar and its only real use is as specimens for collectors.
		- Although crystals are generally more elongated, it is very difficult to distinguish pink Anorthite from Rhodonite.
	www.minerals.net /mineral/silicate/tecto/feldspar/anorthit.htm (162 words)

	The plagioclase feldspar mineral series (Site not responding. Last check: 2007-09-15)
		Variations in the amount of sodium and calcium; and aluminum and silicon, form different minerals in this
		In Anorthite, an aluminum molecule takes the place of a silicon molecule.
		Sodium calcium aluminum silicate, with a varying amount of sodium and calcium.
	www.minerals.net /mineral/silicate/tecto/feldspar/plagiocl.htm.backup (219 words)

	Alan Guisewite's Mineral Collection Images: Systematic Tectosilicates Page
		When molten, the sodium and calcium are homogenous; as the melt crystallizes, the two silicates separate into interference-creating layers - these layers cause the beautiful flashes of color in moonstone and labradorite.
		afghanite, albite (and varieties pericline, peristerite), and peristerite subvariety larvikite), analcime, anorthite (variety labradorite), anorthoclase (and variety sun-moon stone
		This miniature of 50 - 70% anorthite / 50 - 30% albite (labradorite) is probably from Madagscar.
	www.cs.cmu.edu /~adg/adg-psstimages.html (5636 words)

	Anorthite Mineral Data
		Comments: Opaque white crystal of anorthite with dark brown solidified lava coating.
		VIII/J.07 - Feldspar group, Anorthoclase - Anorthite - Banalcite series
		Print or Cut-and-Paste your Anorthite Specimen Label here :
	webmineral.com /data/Anorthite.shtml (267 words)

	Anorthite: Anorthite mineral data from mindat.org mineralogy database (Site not responding. Last check: 2007-09-15)
		Anorthite: Anorthite mineral data from mindat.org mineralogy database
		07 : Feldspar group, Anorthoclase - Anorthite - Banalcite series
		Please feel free to link to this page.
	www.mindat.org /min-246.html (226 words)

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