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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 chrysoberyl chrysoberyl (krĭs`əbĕr'ĭl) [Gr.,=golden beryl], a beryllium aluminate used as a gem. ..... Click the link for more information. 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. cat's-eyeAny of several gemstones that display a luminous band reminiscent of the eye of a cat. Grayish green or greenish quartz cat's-eye is the most common type; although it comes from the Orient, it is often called occidental cat's-eye to differentiate it from the rarer, and more valuable, precious or oriental cat's-eye, which is a greenish variety of chrysoberyl. Crocidolite cat's-eye (African cat's-eye) is more commonly known as tigereye. Corundum cat's-eye is an imperfect star sapphire or ruby in which the star is reduced to a luminous zone. |
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The bridesmaids' eight bouquets of white lilac and lilies-of-the-valley had been sent in due time, as well as the gold and sapphire sleeve-links of the eight ushers and the best man's cat's-eye scarf-pin; Archer had sat up half the night trying to vary the wording of his thanks for the last batch of presents from men friends and ex-lady-loves; the fees for the Bishop and the Rector were safely in the pocket of his best man; his own luggage was already at Mrs. |
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