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Topic: Sillimanite

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	NationMaster - Encyclopedia: Sillimanite (Site not responding. Last check: 2007-11-02)
		Sillimanite is a transparent to translucent mineral that ranges in color from white to gray to brownish to greenish.
		Sillimanite is formed from aluminum silicate and is mostly found as silky, fibrous masses and as transparent prismatic crystals with glassy luster.
		Sillimanite is widespread throughout the schists of the Delaware Piedmont area of the U.S and occurs as large masses and steam-rounded boulders at the Brandywine Springs State Park.
	www.nationmaster.com /encyclopedia/Sillimanite (638 words)

	Sillimanite - LoveToKnow 1911
		Sillimanite is a characteristic mineral of gneisses and crystalline schists, and it is sometimes a product of contact-metamorphism.
		in Bohemia (the Faserkiesel of Lindacker, 1792), with corundum in the Carnatic (fibrolite of comte de Bournon, 1802), Chester in Connecticut (sillimanite of G. Bowen, 1824), Monroe in New York ("monrolite"), Bamle near Brevik in Norway ("bamlite").
		Prehistoric implements made of compact sillimanite are found in western Europe, and have a certain resemblance to jade implements.
	www.1911encyclopedia.org /Sillimanite (232 words)

	Sillimanite (Site not responding. Last check: 2007-11-02)
		By making slides of Sillimanite powder and oil, we use birefringence the Becke lines which appear to tell whether the mineral has a higher or lower refractive index than the oil we are using.
		When the sillimanite is rotated 45 degrees past the mean position in the opposite direction, a subtractive position is reached, and the mineral should be a straw yellow color.
		In the case of sillimanite, this is 20 to 30 degrees.
	www.mtholyoke.edu /~mohunter/sillimanite.html (436 words)

	Sillimanite - Wikipedia, the free encyclopedia
		Sillimanite is named after the American chemist Benjamin Silliman (1779-1864).
		Sillimanite is one of three alumino-silicate polymorphs, the other two being andalusite and kyanite.
		Both the fibrous and traditional forms of sillimanite are common in metamorphosed sedimentary rocks.
	en.wikipedia.org /wiki/Sillimanite (117 words)

	Trika Nelson
		Sillimanite is a metamorphic mineral, typically found in schists and gneisses produced by regional metamorphism.
		Sillimanite is transparent to translucent with a vitreous to pearly luster.
		Sillimanite is used in the manufacturing of mullite refactory ceramics, spark plugs, and high temperature crucibles.
	www.und.edu /instruct/mineral/geol318/webpage/trikan (384 words)

	Sillimanite
		Sillimanite is an interesting mineral occurring in metamorphic rocks.
		The presence of sillimanite indicates that these rocks were subjected to a temperature of at least 500º C and generally high pressures (regionally metamorposed rocks).
		Sillimanite is orthorhombic, in long slender crystals without distinct terminations, in parallel groups, and whitish in color at this exposure.
	www.geocities.com /Athens/1612/Roadcuts/sillimanite.htm (239 words)

	SILLIMANITE Chapter15. Nesosilicates
		Sillimanite, an aluminum silicate mineral, was found in the gneiss at Sterling Hill.
		It was found as colorless 1-3 mm crystals, associated with quartz and a garnet in the almandine-pyrope series on the 1500 level, in the central core of gneiss at Sterling Hill.
		The sillimanite used to establish the granulite facies degree of regional metamorphism was found on Hamburgh Mountain to the east of the Franklin-Sterling Hill area.
	franklin-sterlinghill.com /dunn/ch15/sillimanite.stm (81 words)

	Sillimanite (Site not responding. Last check: 2007-11-02)
		Sillimanite is named after the American chemist B. Silliman (1779 - 1824).
		Sillimanite is one of three alumino-sillicate polymorph s, the other two being andalusite and kyanite.
		Both the fibrous and traditional forms of sillimanite are common in metamorphosed sedimentary rock s.
	www.serebella.com /encyclopedia/article-Sillimanite.html (178 words)

	Sillimanite Stone,Sillimanite Gemstone,Sillimonite Gem Stone,Sillimonite Exporters,Sillimonite Suppliers (Site not responding. Last check: 2007-11-02)
		Sillimanite is formed from aluminum silicate and is a transparent to translucent mineral ranging from white to gray, brown and green.
		Blue variety of sillimanite is the most sought and is found only in the ruby-rich Mogok areas of Burma.
		Sillimanite is basically used to manufacture mullite refactory ceramics, spark plugs, and high temperature crucibles.
	www.mineralszone.com /gemstones/sillimanite.html (181 words)

	eHotbid.com \| Buyers Guides \| A-Z Gemstones \| Sillimanite
		Sillimanite is not only scarce, but also difficult for miners to identify and problematic for cutters.
		Sillimanite is formed from aluminum silicate and is usually found as silky, fibrous crystals suitable for cabochons.
		Sillimanite is typically found scattered within layers of metamorphic rocks that have been put under great pressure and high temperature.
	www.ehotbid.com /gemstone_info/infocenter/a-z/sillimanite.html (228 words)

	sillimanite.htm (Site not responding. Last check: 2007-11-02)
		FOREST COUNTY: Tiny radiating fibers and clusters of sillimanite are intergrown with quartz in the McCaslin Quartzite at Deer Lookout Tower and adjacent outcrops extending into Oconto and Marinette Counties.
		JACKSON COUNTY: Sillimanite was tentatively identified as fibrous grains in talc schist exposed at the Jackson County Iron Mine east of Black River Falls (SE sec.
		MARINETTE COUNTY: Tiny radiating fibers and clusters of sillimanite are intergrown with quartz in the McCaslin Quartzite (Olson, 1964).
	www.uwrf.edu /~wc01/sillimanite.htm (397 words)

	Sillimanite,Aluminum Silicate,Sillimanite Mineral,Sillimanite Uses
		One outstanding feature of sillimanite is that the volume porosity of grains hardly exceeds 6% after heating and that it tends to decrease as a consequence of vitrification, if heating is prolonged.
		Sillimanite gneiss occurs in flat, smooth outcrops on the north side of the road between the Metchin River and Middle Brook.
		Sillimanite refractories cut into various shapes and sizes or made out of bonded particles are used in industries like cement, ceramics, glass-making, metal smelting, refinery and treatment, tar distillation, coal carbonisation, chemicals manufacture, and iron foundries.
	www.mineralszone.com /minerals/sillimanite.html (639 words)

	HETEROGENEOUS GROWTH AND DISSOLUTION OF SILLIMANITE IN MIGMATITES: EVIDENCE FROM CATHODOLUMINESCENCE IMAGING (Site not responding. Last check: 2007-11-02)
		Compositional heterogeneities within coarse-grained sillimanite crystals provide important clues to the growth and dissolution processes and reactions involved in migmatization of aluminous metasediments.
		The heterogeneous red luminescence is generally consistent with a pattern of (1) nucleation and growth followed by dissolution, (2) further growth, and (3) late dissolution or re-equilibration with a late reactive fluid phase.
		Sillimanite, whose chemistry is commonly neglected, is particularly useful as a reaction and fluid phase monitor in migmatites because most of the associated minerals homogenize as a consequence of volume diffusion at high grades.
	gsa.confex.com /gsa/2002AM/finalprogram/abstract_39346.htm (324 words)

	Sillimanite
		The Sillimanite bearing rock of the area can be classified in to three categories according to percentage of Sillimanite content in the rock.
		The pink coloured variety comprises radiating crystals of Sillimanite while the white coloured variety moistly blanded type of Sillimanite.Grade 3 type of deposit is inferior in comparison to the earlier types.
		In this variety Sillimanite occurs as irregular pathes with quartz and pyrite.
	www.nerdatabank.nic.in /as_silliman.htm (219 words)

	Bedrock Geology Bath 100K Report - Metamorphism and Migmatization - Maine Geological Survey
		Sillimanite is very sparse and is usually isolated from contact with andalusite.
		Where sillimanite occurs in the quartz veins, it can usually be found in minute amounts within biotite grains in the host schist, indicating that the grade of metamorphism is actually slightly higher than is suggested by megascopic occurrences of the critical indicator minerals in hand specimen.
		Within the sillimanite zone the typical assemblage in the metapelites is muscovite + quartz + sillimanite + biotite + plagioclase ± garnet ± cordierite.
	www.state.me.us /doc/nrimc/mgs/explore/bedrock/b42/meta.htm (770 words)

	Olympus Microscopy Resource Center: Polarized Light Microscopy Gallery - Sillimanite Garnet Gneiss
		Sillimanite is an aluminum silicate that usually occurs in rocks that are rich in clay and have undergone regional metamorphism at high temperatures, such as gneisses.
		Typically long and slender in shape, crystals of sillimanite frequently occur in fibrous masses, but are generally too brittle to be considered asbestos.
		Similar to sillimanite, garnets tend to be relatively brittle and do not tend to cleave along crystalline planes.
	www.olympusmicro.com /galleries/polarizedlight/pages/sillimanitegarnetgneisssmall.html (249 words)

	Sillimanite (Site not responding. Last check: 2007-11-02)
		Sillimanite je pojmenovaný po americké lékárně B. Silliman (1779-1824).
		Sillimanite je jeden z tří alumino-polymorphs sillicate, jiný dva být andalusite a kyanite.
		Oba vláknité a tradiční formy sillimanite jsou obyčejné v přeměněných usazených horninách.
	wikipedia.infostar.cz /s/si/sillimanite.html (88 words)

	sillimanitewebpage
		Sillimanite, Al2SiO5, Aluminum Silicate, is a polymorph with two other minerals, kyanite and andalusite.
		Sillimanite is a rare gemstone that is not frequently seen in faceted form.
		Sillimanite has a hardness of 7.5 on the mohs scale, making it very wearable in jewelry.
	www.thebrazilianconnection.com /sillimanitewebpage.html (114 words)

	Sillimanite
		The blue variety of sillimanite is the most sought after and is found only in the ruby-rich Mogok region of Burma.
		Sillimanite is nearly always seen as a flat cut or en cabochon.
		Because it is found with fibrous inclusions, sillimanite is sometimes known in the jewelry world as “fibrolite”.
	www.dandennis.com /sillimanite.htm (149 words)

	ECONOMY-assam
		The major minerals like coal, oil and gas, limestone, dolomite, sillimanite and corundum, iron ore, felspar, glass-sand, refractory and fire clays, kaolin, beryl, gypsum, pyrite, vermiculite, salt, copper, gold etc. have been reported to occur in the state.
		The sillimanite deposits of the Nongstoin state in the Khasi hills are world famous from the point of view of quantity and purity of the mineral.
		Corundum is found to occur in association with the sillimanite deposits.
	www.webindia123.com /assam/economy/economy1.htm (769 words)

	Sillimanite or Fibrolite - Information about Sillimanite or Fibrolite (Site not responding. Last check: 2007-11-02)
		The name Sillimanite comes from the name of Benjamin Silliman, who was professor at Yale University at the 19th siecle and known for its works on oil-petrol).
		Sillimanite is a traditional gemstone found in the gravels of the Mogok Valley in Burma, where some beautiful blue-violet crystals are found.
		Most of the stones are found as slightly waterworned crystal and fine euhedral crystals a re rare in Mogok, sillimanite also occurs in Sri Lanka, Kenya and in Idaho (United States).
	www.gemwow.com /category_info.php?cat1=133&cat2=317 (287 words)

	Metamorphic minerals image gallery
		Sillimanite is colorless, has relief much higher than muscovite.
		This granulite facies schist has very coarse sillimanite prisms which can be seen in long section and in their diamond-shaped cross sections..
		The large high-relief (grayish) patches are andalusite, which is surrounded by a coarse muscovite rim (lower right) but is partially transformed also to sillimanite.
	www.union.edu /PUBLIC/GEODEPT/COURSES/petrology/met_minerals.htm (1162 words)

	fibrous, brown, Category - Sillimanite (Site not responding. Last check: 2007-11-02)
		Sillimanite also called Bucholzite is an alumino-sillicate mineral with the chemical formula Al 2 SiO 5.
		Sillimanite is named after the American chemist Benjamin Silliman (1779 - 1824).
		Dieser Artikel basiert auf dem Artikel Sillimanite aus der freien Enzyklo.
	www.alphasearch.org /directory/Sillimanite.html (152 words)

	Delaware Symbols, Mineral: Sillimanite - SHG Resources
		Sillimanite is widespread throughout the schists of the Delaware Piedmont and occurs as large masses and steam-rounded boulders at the Brandywine Springs State Park.
		Sillimanite is suitable for lapidary work and under the name Fibrolite, it was recognized by geologists in Delaware prior to 1830.
		Sillimanite forms at tempreatures greater than 550oC, and its coarse grain size at Brandywine Springs indicates a prolonged period of high-temperature metamorphism of the rocks.
	www.shgresources.com /de/symbols/mineral (440 words)

	Contact metamorphic sillimanite (Site not responding. Last check: 2007-11-02)
		Contact metamorphic sillimanite (a type of mineral) in a pelitic xenolith (foliated metamorphic rock) from the contact zone.
		Rocks similar to this are exposed in the bed of Sandy Creek north of the picnic shelter.
		It is similar in shape and occurrence to sillimanite that I've examined from elsewhere along the ERB margin and from around other granite bodies in the Llano Uplift.
	uts.cc.utexas.edu /~rmr/E-rock/sillimanite.html (159 words)

	artisan jewelry, handcrafted beaded jewelry, gemstone jewelry
		Its fibrous crystal is quite an interesting mineral form and it is collected as a mineral specimen while the glassy crystal is used as a gemstone and for ornamental carvings.
		Sillimanite crystals can display a cat’s eye which can be very attractive.
		The cat’s eye effect is caused by inclusions of fine, slender parallel fibers that reflect light into a single dynamic sliver running along the center of the crystals.
	www.thebeadedgarden.com /gemstone_info/Sillimanite_gemstone.php (269 words)

	WORLDS largest faceted Sillimanite Gemstones
		The picture below is only a sample picture of the largest sillimanite gems that I have collected over the years.
		Sillimanite is very a under collected gem in my opinion.
		I have some largish chatoyant rough myself which I will be cutting at some point and also have a couple of nice finished stones about 1ct+ each.
	www.pricescope.com /diamonds/x9248.htm (367 words)

	Regional Metamorphism
		For example the first appearance of biotite is at the biotite isograd where chlorite is seen to be reacting to produce biotite.
		Biotite does not disappear at the garnet isograd, and, in fact continues to be seen though the garnet, sillimanite, staurolite, kyanite, and sillimanite zones.
		The texture of the rocks changes from slates and phyllites in the chlorite zone to schists in the staurolite and kyanite zones, to schists and gneisses in the sillimanite zone.
	www.tulane.edu /~sanelson/geol212/regionalmetamorph.htm (2430 words)

	Regional Metamorphism
		Consequently, the critical sequence of aluminum silicates is kaolinite -->pyrophyllite -->andalusite --> sillimanite.
		Locally, muscovite coexists with sillimanite and K feldspar in pelitic rocks of the uppermost zone; thus, the rocks containing these minerals belong to the Amphibolite Facies.
		The Granulite Facies is distinguished by the general absence of white mica and the presence of orthopyroxene and cordierite.
	geology.csupomona.edu /alert/metamorphic/regional.htm (2511 words)

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