The family tends to display gem phenomena such as chatoyancy and color change; some people say that the only real "cat's eye" is a chatoyant chrysoberyl and anything else has to be identified as a "cat's eye quartz" or whatever type of gem it is..
Chrys"o*ber`yl (?), n. [L. chrysoberyllus, Gr. ; gold + beryl.] Min.
A mineral, found in crystals, of a yellow to green or brown color, and consisting of aluminia and glucina. It is very hard, and is often used as a gem.
© Webster 1913.
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