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Topic: Leucite

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	Leucite -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-08)
		Leucite also is rare in plutonic rocks and (A barrier constructed to contain the flow of water or to keep out the sea) dike rocks, but leucite-syenite and leucite-tinguaite bear witness to the possibility that it may occur in this manner.
		By far the greater number of the rocks which contain leucite are (Rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface) lavas of (From 63 million to 2 million years ago) Tertiary or recent geological age.
		Leucite lavas from which felspar is absent are divided into the leucitites and leucite (The commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of calcium-rich plagioclase feldspar and pyroxene) basalts.
	www.absoluteastronomy.com /encyclopedia/l/le/leucite.htm (1662 words)

	Read about Leucite at WorldVillage Encyclopedia. Research Leucite and learn about Leucite here! (Site not responding. Last check: 2007-10-08)
		Leucite is very often accompanied by nepheline, sodalite or
		olivine, augite and biotite; the leucite is partly fresh partly altered to analcite, anti the rock has a spotted character recalling that of the leucite-syenites.
		Leucite lavas from which felspar is absent are divided into the leucitites and leucite
	encyclopedia.worldvillage.com /s/b/Leucite (1337 words)

	LEUCITE - LoveToKnow Article on LEUCITE (Site not responding. Last check: 2007-10-08)
		The missourites are more baiic and Consist of leucite, olivine, augite and biotite; the leucite is partly I re5h, partly altere,d to analcite, anti the rock has a spotted character recalling that of the leucite-syenites.
		By far the greater number of the rocks which contain Icucite are lavas of Tertiary or recent geological age.
		The leucite is often j5resent in two sets of crystals, both porphyritic and as an ingredient of the ground mass.
	90.1911encyclopedia.org /L/LE/LEUCITE.htm (1372 words)

	Chemically derived leucite - Patent 5622551
		A process of making chemically derived leucite comprising the step of admixing a potassia precursor, an alumina precursor and a silica precursor to form a uniform suspension of finely divided particles in a liquid medium such that the particles are capable of remaining uniformly distributed throughout the spension for at least on hour a 25.degree.
		Typically, leucite is incongruently crystallized (i.e., the stoichiometric composition of the amorphous matrix differs from that of the crystalline phase which derives from it) by the heat treatment of a precursor (i.e., antecedent) glassy matrix containing potassia, alumina, silica and other components such as alkali fluxes, nucleating agents and grain growth inhibitors.
		The leucite phase field 1 is enclosed within phase boundary lines 2 and denotes the region of the phase diagram within which the first crystalline solid to be formed on cooling has the chemical composition of leucite.
	www.freepatentsonline.com /5622551.html (8170 words)

	LEUCITE - Online Information article about LEUCITE
		augite and biotite; the leucite is partly fresh, partly altered to analcite, and the rock has a spotted character recalling that of the leucite-syenites.
		Where leucite occurs, it is always eumorphic in small, rounded, many-sided crystals in the ground mass, or in larger masses which have the same characters as the pseudo-leucites.
		iron oxides, with a glassy ground mass in which small rounded crystals of leucite are scattered.
	encyclopedia.jrank.org /LEO_LOB/LEUCITE.html (1653 words)

	Machinable leucite-containing porcelain compositions and methods of manufacture - US Patent 6133174 (Site not responding. Last check: 2007-10-08)
		At room temperature, leucite normally exists in the tetragonal configuration because it is the thermodynamically stable configuration of leucite at this temperature.
		The porcelain leucite compositions of the present invention comprise a continuous glassy matrix phase and a homogenous, dispersed fine crystalline phase comprising leucite.
		This tendency of the leucite is commonly considered a negative attribute in the glass-ceramic field; however, in the present invention it is considered beneficial because it allows additional control of the leucite phase morphology as well as expanding the range of compositions that are suitable for use in the present invention.
	www.patentstorm.us /patents/6133174.html (5426 words)

	Low fusing dental porcelains containing fine-grained leucite - US Patent 6120591 (Site not responding. Last check: 2007-10-08)
		The tetragonal leucite in accordance with the present invention is preferably both fine-grained and uniformly-sized, in order to prevent wear to the opposing dentition.
		to 500° C.), and is empirically determined by means known in the art, depending on the size and distribution of the tetragonal leucite, the composition of the glassy matrix, the desired maturing temperature and coefficient of thermal expansion, and the intended use of the porcelain (e.g., as a core or as an overlay porcelain).
		Generally, the leucite is present in an amount in the range from about 5% to about 65% by weight of the total composition, and preferably in the range from about 5% to about 40% by weight of the total composition.
	www.patentstorm.us /patents/6120591.html (4135 words)

	Olympus Microscopy Resource Center: Polarized Light Microscopy Gallery - Leucite Nepheline Tephrite
		Leucite is a feldspathoid mineral that can be found only in igneous rocks.
		Leucite is relatively rare, but some of the most notable occurrences are found in Uganda, Rome, and Wyoming.
		Similar to leucite, nepheline is sometimes utilized for commercial purposes, primarily as a substitute for feldspar in the production of ceramic and glass items.
	www.olympusmicro.com /galleries/polarizedlight/pages/leucitenephelinetephritesmall.html (210 words)

	Leucite (Site not responding. Last check: 2007-10-08)
		Leucite también es raro en rocas plutonic y rocas del dique, pero el leucite-leucite-syenite y el leucite-tinguaite testimonian a la posibilidad que puede ocurrir de este modo.
		Leucite es acompañado muy a menudo por el nepheline, el sodalite o el nosean; otros minerales que hacen su aspecto con una cierta frecuencia son melanite, granate y mclilite.
		Son ricos en leucite, pero contienen también algún sanidine y a menudo mucho nepheline con el hauyne o nosean.
	www.yotor.net /wiki/es/le/Leucite.htm (1544 words)

	High strength feldspathic dental porcelains containing crystalline leucite - Patent 4798536
		Although not wishing to be bound by any theory or mechanism, it is currently believed that such leucite crystallites serve as nuclei during the fusing and cooling process in order to initiate further crystalline leucite nucleation and growth in the magma.
		Na.sub.2 O is an inhibitor of leucite crystal growth during the fusing and cooling process.
		While the invention has been described in accordance with desirable embodiments and details of procedure, it is obvious that many changes and modifications may be made in the details thereof and in the characteristics of the compositions and articles obtained therefrom without departing from the spirit of the invention.
	www.freepatentsonline.com /4798536.html (3652 words)

	Leucite Jewelry - Links - Autumn Gallery Handcrafted Leucite Gemstone Jewelry (Site not responding. Last check: 2007-10-08)
		Fracture - conchoidal, brittle. Leucite develops in basalt of volcanic rocks and is usually associated with olivine and labradorite.
		Leucite is used for many purposes. A great source for Leucite gemstone jewelry.
		At high temperatures, leucite is isometric and specimen and as a minor source of potassium and aluminum.
	www.autumngallery.net /links_leucitejewelry.html (173 words)

	The World Market for Felspar, Leucite Nepheline, and Nepheline Syenite: A 2005 Global Trade Perspective
		I have developed a methodology, based on macroeconomic and trade models, to estimate the market for felspar, leucite nepheline, and nepheline syenite for those countries serving the world market via exports or supplying from various countries via imports.
		The total level of imports and exports on a worldwide basis, and those for each region, is based on a model which aggregates across over 150 key country markets and projects these to the current year.
		Combined, Chapters 3 and 4 present the complete picture for imports and exports of felspar, leucite nepheline, and nepheline syenite to and from all major countries in the world.
	www.marketresearch.com /researchindex/1026998.html (830 words)

	Effect of ion exchange on the microstructure, strength, and thermal expansion behavior of a leucite-reinforced ...
		Leucite (KAlSi2O6) is used as a reinforcing agent in some porcelains for
		The potassium ions in leucite are exchangeable for rubidium or cesium ions,
		leucite and pollucite exhibit a lower coefficient of thermal expansion and
	jdr.iadrjournals.org /cgi/content/abstract/77/4/583 (364 words)

	Leucite: Definition of Leucite in Webster's Dictionary 1913 Edition - Wunder Dictionary
		Leucite: Definition of Leucite in Webster's Dictionary 1913 Edition
		A mineral having a glassy fracture, occurring in translucent trapezohedral crystals.
		It is found in the volcanic rocks of Italy, especially at Vesuvius.
	websters.wunderdictionary.com /dictionary/def/english/leucite.html (61 words)

	LookSmart - Directory - Guides to Leucite (Site not responding. Last check: 2007-10-08)
		Comb through a profile on leucite that provides the mineral group, Strunz number, location where the mineral is found, crystal system, and the formula.
		Summarizes the chemistry of leucite and names many of the places where it is mined.
		Get a list of locations where leucite is found, the crystal system, hardness, formula, cleavage, and color of the mineral.
	lsxml.looksmart.com /p/browse/us1/us317914/us263953/us330812/us553452/us10180859/us10183749/us10181864 (241 words)

	Science Fair Projects - Talk:Leucite
		By the way, the web page I cite above says the main use of Leucite is as a "mineral specimen", so this is hardly the most important article in the world.
		I'm hoping the major perpetrators of this article, User:Magnus Manske and User:Rmhermen will join in this discussion.
		The leucite rock section needs to be separated out into a petrologic article.
	www.all-science-fair-projects.com /science_fair_projects_encyclopedia/Talk:Leucite (646 words)

	Leucite (Site not responding. Last check: 2007-10-08)
		COMMENTO: la leucite si riconosce fondamentalmente grazie all'abito ed al tipo di roccia in cui si rinviene, inoltre si distingue dai granati grazie a colore e durezza non elevata; è uno dei minerali da collezione che l'Italia riesce ad esportare nel mondo
		Leucite icotetraedrica su matrice (Ariccia, Lazio, Italia - Coll.
		Cristallo icositetraedrico di leucite analcimizzata (Ariccia, Lazio, Italia - Coll.
	www.minerali.it /minerali2/l/leucite.htm (199 words)

	The World Market for Felspar, Leucite Nepheline, and Nepheline Syenite: A 2005 Global Trade Perspective : Market ...
		The World Market for Felspar, Leucite Nepheline, and Nepheline Syenite: A 2005 Global Trade Perspective
		4.2 Asia: Felspar, Leucite Nepheline, and Nepheline Syenite Imports in 2005
		4.6 Oceana: Felspar, Leucite Nepheline, and Nepheline Syenite Imports in 2005
	www.marketresearch.com /map/prod/1026998.html (1013 words)

	Quantum mechanical study of Al/Si disorder in leucite and bicchulite -- Winkler et al. 68 (5): 819 -- Mineralogical ...
		Quantum mechanical study of Al/Si disorder in leucite and bicchulite -- Winkler et al.
		Quantum mechanical study of Al/Si disorder in leucite and bicchulite
		We have studied the structures of Al/Si disordered leucite and
	minmag.geoscienceworld.org /cgi/content/abstract/68/5/819 (194 words)

	IngentaConnect Synthesis of leucite for application in dentistry
		In this study, a new technology for the synthesis of homogeneous leucite powders was investigated.
		Two preparation procedures were proposed, both using hydrothermal conditions.
		Analcime powder with a particle size of 3–4 µm employed for the reaction was prepared by hydrothermal synthesis using aluminium and amorphous silica as starting materials in 4
	www.ingentaconnect.com /content/sgt/gt/2004/00000045/00000002/art00017 (185 words)

	LEUCITE (Site not responding. Last check: 2007-10-08)
		English words defined with "LEUCITE": Amphigene ♦ Leucitic, Leucitoid ♦ Syenite ♦ Tephrite ♦ White garnet.
		Specialty definitions using "LEUCITE": banakite ♦ etindite ♦ leucitite, leucitophyre ♦ metaleucite, monchiquite ♦ shoshonite ♦ trachybasalt.
		Source: compiled by the editor, based on several corpora (additional references).
	www.websters-online-dictionary.org /Le/Leucite.html (430 words)

	ClassicGems.net (Site not responding. Last check: 2007-10-08)
		The world's only source of transparent, facetable Leucite crystals is the Alban Hills, near Rome, Italy.
		Faceted gems are rare and usually very small.
		We have not photographed our Leucite gems yet.
	www.classicgems.net /gem_leucite.htm (41 words)

	LEUCITE LIMITED credit report - Monday 24th October 2005
		LEUCITE LIMITED credit report - Monday 24th October 2005
		As this company has either not, or only recently filed, they are not yet analysed by our system, so we are unable to offer a credit report.
		Notice of change of directors or secretaries or in their particulars.
	www.ukdata.com /company-listings/numbers/05060989.html (102 words)

	The World Market for Felspar, Leucite Nepheline, and Nepheline Syenite: A 2005 Global Trade Perspective - Market ...
		The World Market for Felspar, Leucite Nepheline, and Nepheline Syenite: A 2005 Global Trade Perspective - Market Research Report
		MindBranch accepts credit cards, wire transfers, and PO's so that ordering is easy.
		Note: If you don't see the format or license type you require, please contact a customer service representative for assistance.
	www.mindbranch.com /products/R307-7527.html (901 words)

	Rossano Carlini minerals (Site not responding. Last check: 2007-10-08)
		Leucite, typical mineral from Albani Hills and Roccamonfina volcanos.
		Fine perfect white orange crystal of 3x3 cm in 6x6 volcanic matrix.
		Fine perfect white orange crystal of 3x3 cm in 4,5x4 volcanic matrix.
	www.mineralsvillage.com /Leucite%20page.htm (102 words)

	High density leucite based ceramics from zeolite (US5071801)
		High density leucite based ceramics from zeolite (US5071801)
		The addition of pollucite to the leucite article provides a ceramic article whose thermal expansion coefficient can be varied from about 2×10
		A process for producing a substantially crack free ceramic article having less than 5% porosity and whose principal crystalline phase is tetragonal leucite comprising calcining a powder of a potassium exchanged zeolite, the zeolite having a SiO
	www.delphion.com /details%3Fpn10%3DUS05071801 (245 words)

	U.S. Pregrant 20050034631 - Leucite glass ceramic doped with nanoscale metal oxide powder, method for producing the ... (Site not responding. Last check: 2007-10-08)
		U.S. Pregrant 20050034631 - Leucite glass ceramic doped with nanoscale metal oxide powder, method for producing the same, and dental materials and dental products formed therefrom
		Leucite glass ceramic doped with nanoscale metal oxide powder, method for producing the same, and dental materials and dental products formed therefrom
		Glass compositions, compositions containing glass other than those wherein glass is a bonding agent, or glass batch forming compositions
	cxp.paterra.com /uspregrant20050034631.html (105 words)

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