chrysoberyl

[kris-uh-ber-uhl]
noun
a mineral, beryllium aluminate, BeAl 2 O 4 , occurring in green or yellow crystals, sometimes used as a gem.
Also called cymophane.


Origin:
1350–1400; Middle English < Latin chrȳsoberyllus < Greek chrȳsobḗryllos, equivalent to chrȳso- chryso- + bḗryllos beryl

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World English Dictionary
chrysoberyl (ˈkrɪsəˌbɛrɪl)
 
n
a rare very hard greenish-yellow mineral consisting of beryllium aluminate in orthorhombic crystalline form and occurring in coarse granite: used as a gemstone in the form of cat's eye and alexandrite. Formula: BeAl2O4

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Encyclopedia Britannica
Encyclopedia

chrysoberyl

gemstone, beryllium and aluminum oxide (BeAl2O4). A variety that is often cloudy, opalescent, and chatoyant is known as cymophane. Some cymophane, when cut en cabochon (in convex form), comprises the most highly prized cat's-eye.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences for chrysoberyl
The only wellknown natural gemstones harder than chrysoberyl are corundum and diamond.
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