cat's-eye


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cat's-eye,

gemstone that displays a thin band of reflected light on its surface when cut as a cabochon. Its name is derived from its supposed resemblance to the eye of a cat. The optical effect, known as chatoyancy, is caused by the reflection of light from very thin, closely spaced filaments in parallel arrangement within the stone. True cat's-eye, a variety of chrysoberylchrysoberyl
[Gr.,=golden beryl], a beryllium aluminate used as a gem. It has a vitreous luster and is transparent to translucent. The more valuable cat's-eye is a variety of chrysoberyl. Another variety, alexandrite, was first discovered in the Ural Mts.
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 from Sri Lanka and Brazil, is the most valuable, but some quartz, tourmaline, and a few other minerals that display chatoyancy are also used as gems. A golden-yellow species called tiger's-eye is a form of quartz that contains crocidolite asbestos.
References in periodicals archive ?
Gem Trade Lab Notes: Zircon, a rare cat's-eye. Gems & Gemology, 19(4), 237.
Cutler and Gross offers a classic tortoiseshell take on 1950s cat's-eye glamour.
While these studies concentrated on the bright line(s) of the cat's-eye or star, the author is not aware of any explanations in the literature for the coffee-and-cream effect in chatoyant cabochons.
A CAT'S-eye that changes colour to match traffic lights is to be tried out on roads in Britain.
Feminine cat's-eye style 'F-3561' has a baroque pattern on the sides and a scalloped edge for a twist on colour blocking.
A WOMAN motorcyclist, badly injured 10 years ago when her machine hit a cat's-eye, has won pounds 275,000 compensation.