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Topic: Agate

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	Agate
		In the formation of an ordinary agate, it is probable that waters containing silica in solution--derived, perhaps, from the decomposition of some of the silicates in the lava itself--percolated through the rock, and deposited a siliceous coating on the interior of the vapour-vesicles.
		Many agates are hollow, since deposition has not proceeded far enough to fill the cavity, and in such cases the last deposit commonly consists of quartz, often amethystine, having the apices of the crystals directed towards the free space, so as to form a crystal-lined cavity or geode.
		On the disintegration of the matrix in which the agates are embedded, they are set free, and, being by their siliceous nature extremely resistant to the action of air and water, remain as nodules in the soil and gravel, or become rolled as pebbles in the streams.
	www.jewelry-paideia.com /reference/ref-gemstone-agate-1.php (1967 words)

	Agate - Wikipedia, the free encyclopedia
		Most agates occur as nodules in volcanic rocks or ancient lavas where they represent cavities originally produced by the disengagement of volatiles in the molten mass which were then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls.
		Many agates are hollow, since deposition has not proceeded far enough to fill the cavity, and in such cases the last deposit commonly consists of quartz, often amethyst, having the apices of the crystals directed towards the free space so as to form a crystal-lined cavity, or geode.
		The agates are extremely resistant to weathering and remain as nodules in the soil or are deposited as gravel in streams and shorelines.
	en.wikipedia.org /wiki/Agate (844 words)

	Thaigem.com \| Info Center \| Gemstone Discovery \| Agate
		Agate is a cooling stone; it reduces fever, quenches thirst, quiets the pulse and heart throbs and ensures good health and a long and prosperous life.
		Agate is formed in a unique way and many fossils are actually agatized material that has replaced the original organic substance.
		The main conditions necessary for agate formation are the presence of silica from devitrified volcanic ash, water from rainfall or ground sources, manganese, iron and other mineral oxides that form the bands and inclusions.
	www.thaigem.com /dis_agate.asp (358 words)

	Encyclopedia Judaica: Mezuzah Scroll, Mezuzah parchment, How a Mezuzah is Made, How to Affix a Mezuzah.
		Description: SiO 2 Agate is a semipellucid crystallized quartz, consisting of banded or with branching inclusions chalcedony.
		Agates are identical in chemical structure to jasper, flint, chert, bloodstone, and tiger-eye, and are often found in association with opal.
		Agate is one of the gemstones, that used in commesso, also called florentine mosaic.
	www.all-that-gifts.com /se/agate.html (580 words)

	Agate Birthstone
		Agate has been found with the remains of Stone Age man in France from as early as 20,000-16,000 B.C. and the Egyptians used agates prior to 3000 B.C. for talismans, amulets, seals, rings and vessels.
		Agate is a microcrystalline variety of chalcedony, 6.5-7 on the Mohs scale, which occur in nodular masses in volcanic lava rocks.
		Agate is said to have mystical powers to guard one against danger, to cure insomnia, to ensure pleasant dreams and to help with clarity enabling one to see the world through a broader perspective.
	www.bernardine.com /birthstone/agate.htm (1084 words)

	Agate - Gemstone Information
		Agate is the name given to a wide selection of varieties of chalcedony, a form of quartz which is cryptocrystalline.
		The names for chalcedony and agate are somewhat interchangeable, although the term agate is usually used to describe the banded varieties of chalcedony.
		Agate is frequently found in the form of rounded nodules or geodes.
	www.24carat.co.uk /agate.html (294 words)

	NASA - AGATE -- Revitalizing General Aviation
		The AGATE Consortium is a unique partnership between government, industry, and academia established to develop new ways of reviving the troubled general aviation industry.
		AGATE targets trips of 150 to 700 miles - round trips that are too far to complete in a day and too short to efficiently use the hub-and-spoke system.
		AGATE is in the right place at the right time to support modernization of the system for GA," said Dr. George F. Donohue, FAA associate administrator for research and systems acquisition.
	www.nasa.gov /centers/langley/news/factsheets/AGATE.html (1743 words)

	Dave's Down To Earth Rock Shop Agate!!!
		Origin Agates are found as ball- or almond-shaped nodules with sizes ranging from a fraction of an inch to a circumference of several yards; more rarely they are found as fillings of crevices in volcanic rock (such as melaphyre and porphyry).
		Dendritic agate, moss agate, mocha agate - colorless or whitish, translucent chalcedony with dendrites; moss-like inclusions of hornblende or chlorite.
		Brown or fl agates having a white ring in the center were chiefly used for the fabrication of these amulets, the white ring being regarded as a symbol of the eye.
	www.davesdowntoearthrockshop.com /agate.htm (1421 words)

	The Agateer
		Agates are "an excellent object" for this sort of study, he argues.
		Agates being rocks — mixtures of minerals —; they were "boundary crossers," in today’s jargon.
		The agateer’s focus is on beauty, texture, and proportion; there is the thrill of the hunt and the pleasure of the polish.
	www.rps.psu.edu /0109/agateer.html (2075 words)

	agate
		Agates are a form of Chalcedony Quartz, they come in various colors and may have banded stripes, variegated sections, mosslike inclusion, wavy lines and any other variation you can think of.
		Agates are formed when gas bubbles are trapped in solidifying lava and then become filled with alkali and silica bearing water when coagulates into a gel.
		Agates lend their aid to stomach complaints, and ailments of the colon, liver, spleen and kidneys.
	www.joellessacredgrove.com /Gems/agate.html (941 words)

	Agate - Facts, Lore, History, Myths and Pictures
		Agate is the accepted gemstone for the 12th and 14th wedding anniversaries.
		A hard stone, usually within the range of 7-9 on the Mohs scale agates are found in all colors of the rainbow, although green and blue are quite rare.
		Agate is a variety of chalcedony formed from layers of quartz which usually show varicolored bands.
	www.bernardine.com /gemstones/agates.htm (513 words)

	Agate Colored Gemstones Information Sheet ~PGR Gems
		The mining of agate in the Nahe River valley in Germany which was already documented in 1497 gave rise to the cutting center of Idar-Oberstein, Germany.
		Agates and Jaspers are a cryptocrystalline (crystals too small to be seen even by a microscope) variety of quartz, known as chalcedony.
		Some of the more common of these types are chrysoprase (a pure green agate), sard (a yellow to brown agate), sardonyx (banded sard), onyx (fl and white agate), carnelian (a yellow to orange agate), flint (a colorful and microscopically fibrous jasper), jasper (a colorful opaque agate) and bloodstone (a green with red speckled jasper).
	www.pgrgem.com /color/datasheets/pgragate.html (452 words)

	Agates-R-Us.Com - Lake Superior Agates & More (Site not responding. Last check: 2007-11-03)
		A term applied to a a pattern of agate banding often resembling the enclosing nature of a fort.
		A type of agate that exhibits the optical effect created by the perception of depth between parallel bands of chalcedony.
		Another name for the intact surface of the agate that was in direct contact with the host lava; the husk.
	www.agates-r-us.com /definitions.html (1434 words)

	Agate
		As a result, agate is often found as a round nodule, with concentric bands like the rings of a tree trunk.
		Agate was highly valued as a talisman or amulet in ancient times.
		The mining of agate in the Nahe River valley in Germany, which was already documented in 1497, gave rise to the cutting-centre of Idar-Oberstein.
	www.gemstone.org /gem-by-gem/english/agate.html (315 words)

	Montana agate information - Montana moss agate,chalcedony,quartz,agate formation,agate,Yellowstone river. (Site not responding. Last check: 2007-11-03)
		Agate is one of the most varied and desired forms of "chalcedony" which is one of the many varieties of quartz.
		Agates and chalcedony in other forms, like chrysoprase and carnelian, jaspers and flints, are some of the cryptocrystalline forms of quartz.
		Agates in many different varieties are distributed worldwide but localities of agate beds of major significance only number less than a hundred.
	www.harmons.net /agateinf.html (748 words)

	Lake Superior agate - Digging into MN Minerals: Minnesota DNR
		A common subtype of the fortification agate is the parallel-banded, onyx-fortification or water-level agate.
		These rare agates are believed to have spent a long time tumbling back and forth in the waves along some long-vanished, wave-battered rocky beach.
		During glacial movement, most of the agates were badly fractured by tremendous pressures within the ice and by repeated freezing and thawing.
	www.dnr.state.mn.us /education/geology/digging/agate.html (1420 words)

	GemRocks: Agate
		Shadow agate - agates of the Lake Superior region whose flat, polished surfaces appear wavy or to have shadowed areas, some of which have been termed "fl holes." Sukow (1999) offers an hypothesis to account for this feature, and indicates how one might spot this effect in raw material.
		Agate referred to as Lake Superior or Duluth agate in Minnesota, and sometimes called Keweenaw or Isle Royale agate in Michigan, is the official state gemstone of Minnesota.
		Agate, otherwise not specified, is one of two state gemstones of Montana.
	www.cst.cmich.edu /users/dietr1rv/agate.htm (2886 words)

	Agate Creek Agate
		Agate Creek in far North Queensland is the acknowledged Australian source for attractively patterned agates that occur in and are weathered from amygdaloidal basalt of Carboniferous age.
		Agate Creek agates are renowned both for the beauty and diversity of their attractive colour patterns.
		It is a pity that agate from Agate Creek in North Queensland is little appreciated outside of Australia, for this agate displays nearly every conceivable colour and pattern that is possible to observe in agate.
	www.gem.org.au /agate.htm (2013 words)

	Agate
		These "varieties" are not really Agates, as they lack banding, and, although they have the word agate in their name, are only a variety of Chalcedony.
		Agate from Botswana banded with fine, parallel lines, often with a preponderance of pink blending into white.
		Agate consisting of thin bands in a lacy or wavy pattern.
	www.minerals.net /mineral/silicate/tecto/quartz/varietys/agate.htm (550 words)

	Agate
		Agate is a common semiprecious silica mineral that has long been used as a gem and ornamental.
		Agate is, in fact, identical with quartz in composition and physical properties.
		Varieties of agate are characterized by peculiarities in the shape and color of the bands, which are seen in sections cut at right angles to the layers.
	www.desertusa.com /mag98/april/papr/geo_agate.html (694 words)

	Agate Factsheet and Information Page at mineralminers.com
		Agate is a variety of chalcedony, which is the general term applied to fibrous cryptocrystalline quartz varieties.
		Agate is commonly associated with siliceous volcanics, occurring as vein or vesicle filling.
		Agate is said to enhance one's perceptiveness and to stimulate analytical capacity, and to provide balance between one's physical, emotional, intelectual and spiritual states.
	www.mineralminers.com /html/agaminfo.htm (731 words)

	ARKANSAS CRYSTAL WORKS Tumbled Beach Agate
		Agate in general can be used for strength, bravery, longevity, and etc. It is thought to enhance the growth of flowers or crops.
		You may 'plant' some agate which has been charged to promote abundance, or hang small pouches of agate from trees to increase their yield.
		Agate is also used for love (to prevent spite and envious thoughts), health (for blood, skin and intestines), and is thought to help prevent children from falling and adults from stumbling.
	www.arkansascrystalworks.com /agate.htm (256 words)

	Gem Hut - Agate Gemstones
		Agate is a banded colored stone found in nodular masses associated with volcanic lavas.
		Agate, being porous, is often dyed or stained.
		Agate occurs in a variety of forms, including petrified wood, which has had it's organic matter replaced by agate.
	www.gemhut.com /agate.htm (179 words)

	Agate Lexicon Letter (Site not responding. Last check: 2007-11-03)
		Del Norte Plume Agate, for Del Norte, Colorado, thunder egg agates with generally golden to orange-yellow plumes, and sometimes sagenitic inclusions in colorless, banded matrix.
		...agates in easterns source are reds, oranges or yellows and those in western source are dark gray and white (Steege, 1961, p.
		A vein agate that is white and porous such that it readily accepts dyes.
	csd.unl.edu /agates/agatelexiconletter.asp?Agate=D (3126 words)

	Fire Agate International
		Gem quality Fire Agate has been found only in parts of California, Arizona,and Mexico, and within the last sixty years, making it the rarest and newest multicolored gemstone in the world.
		Legend has it among some people who love Fire Agate, that it possesses a "special energy" that can be felt when the stone is worn or held in the hand.
		Fireagate.com is the world's premier distributor of rare and precious fire agate gemstones and gem-grade fire agate carvings.
	fireagate.com (368 words)

	Gemstones beginning with A
		This distinction stems from agate being composed of microscopic "fibers" of crystalline quartz while jasper is made of microscopic "grains" of crystalline quartz.
		Agate with light blue bands in a lacy or wavy pattern is known by this name.
		The agate's bright reds and yellows are made even more vivid by their contrasting bands of cooler, more-subtle hues.
	www.rings-things.com /gemstone/a.htm (4804 words)

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