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Topic: Opal

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	Opal - LoveToKnow 1911 (Site not responding. Last check: 2007-10-18)
		According to Pliny the opal ranked next in value to the emerald, and he relates that the rich Roman senator Nonius was exiled by Mark Antony for sake of his magnificent opal, as large as a hazel nut.
		Precious opal is found also in Honduras, especially in trachyte near Gracias a Dios; and in Mexico, where it occurs in a porphyritic rock at Esperanza in the state of Queretaro.
		It is notable that the opal sometimes replaces shells and even reptilian bones, whilst curious pseudomorphs, known as "pineapple opal," show the opal in the form of aggregated crystals, perhaps of gypsum, gaylussite or glauberite.
	www.1911encyclopedia.org /O/OP/OPAL.htm (1006 words)

	Hurricane Opal 1995
		Although Opal was barely a major hurricane - in a weakening mode - when the eye crossed the coast, property damage was rather severe.
		Opal reached hurricane intensity on October 2nd, and begin a slow northward motion in response to an upper level trough moving the through the central United States.
		The storm surge that occurred during Hurricane Opal, unlike the wind speeds, was constistent with a major hurricane.
	www.geocities.com /hurricanene/hurricaneopal.htm (1017 words)

	USATODAY.com (Site not responding. Last check: 2007-10-18)
		The weather pattern that brought Hurricane Opal inland across western Florida and hauled the storm's remnants northward, was similar to patterns that kept four Atlantic hurricanes away from the USA earlier in the season.
		Opal quickly weakened into a tropical depression with winds less than 39 mph less than a day after coming ashore near Pensacola, Fla., the evening of Oct. 4 with sustained winds of 125 mph.
		For a while on Oct. 4, Opal was a Category 4 hurricane with winds up to 150 mph, inviting comparisons with Hurricane Camille, the second strongest hurricane to hit the USA this century.
	www.usatoday.com /weather/wopal.htm (243 words)

	Opal - Wikipedia, the free encyclopedia
		Opal is a mineraloid gel which is deposited at relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, and basalt.
		Fire opal is a translucent to semi-opaque stone that is generally yellow to bright orange and sometimes nearly red and displays pleochroism at certain angles.
		The opal is the official gemstone of South Australia and the Commonwealth of Australia, and the country's women's national team in basketball is nicknamed The Opals.
	en.wikipedia.org /wiki/Opal (932 words)

	Opal
		Opals are said to impart bad luck on those who stray in love or attempt to use the power of the stone for selfish or evil purposes.
		Because Opals are basically "wet" rocks, meaning that water is trapped within their crystaline structure, (which gives the stone it's beautiful iridescence), it must be protected from harsh chemicals, sunlight and heat to keep the water from escaping.
		Opal is the modern October birthstone and the mystical birthstone for April.
	www.mysticmountainjewelry.com /opal.htm (621 words)

	OPAL
		Opal mining is a very difficult process, and few mines prove to be successful.
		Boulder Opal was formed milliions of years ago from a solution that flowed into seams, cracks, and cavaties in a type of sandstone known as Ironstone.
		The play of color that Opal is known for is the result of the diffraction of light by these spheres and the spaces in between them.
	www.bestcrystals.com /opal.html (321 words)

	Opal
		In these,the opal occurs as an infilling of pores or holes or between grains of the host rock (ironstone). Varieties of boulder opals are defined by body tone, play-of-colour and transparency.
		The opal occurs as a filling or lining between the concentric layers or in radial or random cracks in the ironstone, or as a kernel in smaller concretions or nuts.
		Matrix opal is where the opal occurs as a network of veins or infilling of voids or between grains of the host rock (ferruginous sandstone or ironstone).
	www.nrw.qld.gov.au /mines/fossicking/opal.html (1036 words)

	Gemstones - Opal
		Opal is brittle, heat sensitive, and breaks and scratches easily; additionally, some varieties self- destruct through the loss of water.
		Opal has over one hundred variety and trade names, but the list of accepted or commonly used names is much shorter.
		Precious opal may be subdivided further by color modifiers, white, fl, pinks, and blue, which describe the body color of the opal.
	minerals.usgs.gov /minerals/pubs/commodity/gemstones/sp14-95/opal.html (1147 words)

	Opal (Site not responding. Last check: 2007-10-18)
		Opal is found mainly between concentric layers on the underside of the nuts or as a network of thin veins through the ironstone concretion.
		Distribution of opal deposits in Queensland is extremely wide and erratic in contrast to the relatively confined occurrences in New South Wales and South Australia.
		The opal belt stretches to the west of the railheads at Cunnamulla, Quilpie, Longreach and winton, and encompasses the smaller centres of Eulo, Eromanga, Windorah and Jundah.
	www.opalhut.com.au /opal.htm (2189 words)

	Opal
		All of Nature’s splendour seems to be reflected in the manifold opulence of fine Opals: fire and lightnings, all the colours of the rainbow and the soft shine of far seas.
		This clearly describes how Opal was in fact mined: many Opal prospectors made their home in deep holes or caves in the ground, to protect themselves from the burning heat of daytime and from the icy winds of night time.
		Opals are supposed to further enhance the positive characteristics for people born under the zodiac sign of Cancer.
	www.gemstone.org /gem-by-gem/english/opal.html (1796 words)

	Opal (Site not responding. Last check: 2007-10-18)
		Opal was originally the gem trade's recognized birthstone for October but in 1952 the Jewelry Industry Council suggested that pink tourmaline be an alternate stone to opal.
		It seems that Anne had an opal that that reflected her moods: it shone red when she was angry, blue when she was sad and green when she was happy.
		Fibrous microcrystalline quartz, microcrystalline opals and non-crystalline opals all showed diffuse X-ray small angle scattering that were due to inhomogeneous distributions of water in their microstructures.
	csd.unl.edu /Birthstones/opal.asp (901 words)

	The House of Tibara, Opal Specialists - What Is Opal? (Site not responding. Last check: 2007-10-18)
		Opal is a form of silica chemically similar to quartz, but more like glass and containing a variable amount of water within the mineral structure.
		Precious opal is composed of small spheres of amorphous silica gel arranged in irregular and regular patterns.
		This can be readily demonstrated by rotating red-fire opal and noting one particular area of color which changes from red through green to blue as the angle of incidence to the observer is increased.
	www.opal-tibara.com /what.shtml (894 words)

	Opal Preliminary Report
		Satellite imagery and synoptic analyses indicate that Opal originated from a tropical wave that emerged from the west coast of Africa on 11 September.
		Opal intensified into a category four hurricane on the Saffir/Simpson Scale early on 4 October at which time reconnaissance aircraft reported a small, 10 nmi diameter eye.
		Opal weakened rapidly after moving inland, becoming a tropical storm over southern Alabama and a tropical depression over southeastern Tennessee.
	www.aoml.noaa.gov /hrd/prelim/Opal_prelim.html (1536 words)

	GO 340 Opal
		Opal is a low temperature mineral, found in cracks or cavities filled after the host rock was formed or as replacement after fossils or wood.
		Opal is not a durable gemstone, because of low hardness, brittleness, low heat tolerance, and the fact that it may be ruined by exposure to chemicals.
		Therefore, opal is commonly "assembled," or sandwiched between two pieces of other material often a cap of quartz and base layer of common opal or onyx, to improve on its durability.
	www.emporia.edu /earthsci/amber/go340/opal.htm (648 words)

	Opal
		opal is a low temperature mineral and is found in cracks or cavities that are filled in late in their geological life.
		There are fundamentally three types of opal: precious opal (containing flashes of fire), the yellow-reddish "fire opal" which is named for its color (not flashes of fire), and common opal (sometimes called "potch").
		Black opal, opal containing a predominantly dark background (dark-gray to blue-fl) is the rarest, and most desired of all opals.
	www.theimage.com /gemstone/opal/opal.html (644 words)

	Hurricane Opal - Wikipedia, the free encyclopedia
		Opal was the ninth hurricane to form in the abnormally active 1995 Atlantic hurricane season.
		Opal brought heavy surge to the area, 8-15 feet in some areas, comparing itself to Hurricane Eloise, which struck the same area at near equal strength in 1975.
		Opal was the first of only 5 storms to be assigned a name beginning with 'O' since hurricane naming began in the Atlantic in 1950.
	en.wikipedia.org /wiki/Hurricane_Opal (784 words)

	OPAL main
		Opal mined from a damp or wet source, or that mined from volcanic host rock is more prone to dehydration than that mined from a dry source or from a sedimentary host rock.
		Synthetic Opals manufactured by the Gilson Co. are outstanding for their bright, large patches of color.
		These features, which are uncommon in all but the best natural opal, as well as highly irregular color boundaries (snakeskin- or honeycomb-textured at 50-60X magnification) and a somewhat ordered appearance to the color patches, are usually sufficient to tell a synthetic from a natural.
	www.geo.utexas.edu /courses/347k/redesign/gem_notes/opal/opal_main.htm (1095 words)

	Thaigem.com – Opal, Black Opal, Opal Rough, Fire Opal, Opal Stone
		In this novel the heroine owned an opal that burned fiery red when she was angry and turned ashen gray upon her death.
		Opal and tourmaline are the official stones for those born in October, and famous French actress Sarah Bernhardt rarely left the house unless adorned with her opalescent birthstone.
		As opal is relatively soft and fragile it is often made into doublets or triplets backed with plain fl opal and fronted with clear quartz.
	www.thaigem.com /dis_opal.asp (561 words)

	The House of Tibara, Opal Specialists - Opal Types & Composite Stones
		The main opal producing area of Australia is shown by a red square.
		A triplet is a thin layer of precious opal, onto one face of which is fixed an opaque base of natural or artificial material, and onto the other a clear quartz domed top.
		A doublet is a layer of precious opal, onto one face of which has been fixed an opaque base of natural or artificial material.
	www.opal-tibara.com /types.htm (319 words)

	C&EN: SCIENCE & TECHNOLOGY - WHAT'S THAT STUFF? OPALS
		The third group, common opal, is amorphous and rather opaque, and some of its varieties are named honey opal, milk opal, and moss opal.
		opal is formed from low-temperature hydrothermal solutions or when groundwater leaches silica from the soil, leaving it behind in cracks deep within the earth after accumulated groundwater has evaporated.
		Opal Essence is the name that has been given to both glass and plastic imitations, which are also difficult to distinguish from precious opal with the naked eye.
	pubs.acs.org /cen/whatstuff/stuff/8104sci3.html (867 words)

	OPAL (Hydrated Silica Glass) (Site not responding. Last check: 2007-10-18)
		Opal has been a popular gem for many centuries and has a very interesting structure.
		Opal is considered a mineraloid because this structure is not truly crystalline.
		Yet in Precious Opal, the variety used most often in jewelry, there are many organized pockets of the spheres.
	mineral.galleries.com /minerals/mineralo/opal/opal.htm (438 words)

	Opal Whiteley's Christian Endeavor
		Opal was highly influenced by the University of Oregon's Dr. Thomas Condon.
		Opal did not "worship nature" but taught that Nature is God's creation to be cared for and not trampled on.
		Opal maintained her religious faith all through her 75 years of disgrace and 50 years in mental hospitals.
	www.efn.org /~opal/endeavor.htm (550 words)

	Psychology Press: Email Alerting (Site not responding. Last check: 2007-10-18)
		OPAL is a free service designed to provide you with the latest information about books and journals in your field of interest.
		OPAL Journals is a service designed to deliver tables of contents by email for any available journal to anyone who has requested the information.
		OPAL Books is our email alerting service that allows you to receive email notification of new books, forthcoming events, and special offers in specific areas of academic psychology and mental health.
	www.psypress.co.uk /opal (228 words)

	Opal Information - Gemstones A2Z
		Opal is a paradoxical gemstone, and one of the most fascinating.
		Some people think opal is unlucky, but it is one of the most valuable and desirable of gems.
		Actually because opal is a gel, it is, strictly speaking, not a form of quartz.
	www.24carat.co.uk /opal.html (290 words)

	Opal
		Ops is the symbolized of "goddess of fertility" in Roman mythology.
		Since Opal is too much beauty, and none like it has over been seen, it came to be called "Orphanus (orphan) Jewel" in Germany.
		She has perceived that Opal is greatly useful to the finances of Britain immediately.
	www.suevematsu.com /opal.html (702 words)

	Opal
		Opal (noun): A non crystalline form of the mineral silica which, despite its amorphous structure, displays an amazing degree of internal organization.
		Opal is undoubtedly the most prized gemstone in the world at present and is perfect for all types of opal jewelry including opal rings and opal pendants.
		Interestingly, all Australian opal is of sedimentary formation and occurred when the inland sea that covered a large area of mainland Australia receded and then began to dry, over 150 million years ago.
	www.opal.net.au (188 words)

	Opal Birthstone Products
		Opal is the birthstone for October and the gemstone given to commemorate a 14th wedding anniversary.
		Opal is a non-crystallized silica, a mineral found near the earth's surface in areas where ancient geothermal hot springs once existed.
		Opals were routinely set into the crowns and necklaces of rulers who believed the protective powers of the gemstones would ward off evil.
	www.babiesonline.com /birthstones/Opal.asp (593 words)

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