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tiger's eye
Tiger's eye (also called Tigers eye or Tiger eye) is a
chatoyant gemstone that is usually a metamorphic rock that is a golden to red-brown colour, with a silky luster. A member of the quartz group, it is a classic example of pseudomorphous replacement by silica of fibrous crocidolite (blue asbestos). An incompletely silicified blue variant is known as Hawk's eye.
==Cut, treatment and imitation==
The gems are usually cut en cabochon in order to best display their chatoyancy. Red stones are brought about through gentle heat treatment. Dark stones have had their colours improved and been artificially lightened using nitric acid treatments.
Honey-colored stones have been used to imitate the much higher valued cat's eye chrysoberyl (cymophane), but the overall effect is unconvincing. Artificial fibre optic glass is a common imitation of tiger's eye, and is produced in a wide range of colours. Tiger's Eye comes primarily from South Africa and east Asia.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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