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Are you digging the hot trendy glasses the stars, models and rock stars are all wearing in the spot light? If so you're not alone the glasses they are wearing are flying off the shelves. It seems everyone wants to get into this hot new fashion trend that is proven its staying power. We saw these trendy glasses last fall, they hung around over the summer and are now back again bigger than ever this fall.
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Opal is a hydrated, noncrystalline silica mineral, some varieties of which display a rainbow of colors. The water content of opal varies from 1% to 21%, which gives it a hard, brittle character. Its hardness ranges from 5 to 6.5, and its specific gravity ranges from 1.9 to 2.3, depending on its water content.
The varieties that show flashes of spectral colors are known as precious opal and have been used as gemstones since antiquity. Varieties that do not show such iridescence are known as common opal. Among the former kind, white, blue, and black opals are most valuable. They are so named because the flashes of spectral colors occur against a white, blue, or black background provided by the body of the stone.
An early source of precious opal was Czerwenitza, near Kosice, Czechoslovakia. Many fine specimens have come from Queretaro and Zimapan, Mexico, and Gracias, Honduras. Most of the transparent red to orange-red variety known as fire opal comes from the Mexican localities. Fire opal often does not show a flash of colors.
More recently, the chief source of fine opals has been White Cliffs and Lightning Ridge, New South Wales, and Bulla Creek and Barcoo River, Queensland, Australia. Many fine opals have come from Humboldt county, Nevada, and some from Latah county, Idaho, where they are usually associated with petrified wood. In the finer specimens of petrified wood, which preserve the detail of the original structures, the original organic matter was replaced by opal rather than by quartz, which is a nonhydrous, crystalline variety of silica.
Some plants and animals, such as bamboo and diatoms, deposit opal in the hard parts of their structure. Diatomaceous earth is a variety of opal that consists of the remains of diatoms, which are minute forms of animal life.
The superstition of bad luck, long associated with the opal, arises from the tendency of opals to crack spontaneously in dry climates due to the loss of some of the essential water. Opal jewelry should therefore be occasionally immersed in water to avoid the development of cracks.
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