cymophane

[ sahy-muh-feyn ]

/ ˈsaɪ məˌfeɪn /

chrysoberyl.

Origin of cymophane

First recorded in 1795–1805; cymo- + -phane

cymling, cymo-, cymogene, cymograph, cymoid, cymophane, cymose, cymotrichous, cymric, cymru, cymry

Another important variety is that of the chrysoberyl called "cymophane."

The Chemistry, Properties and Tests of Precious Stones |John Mastin
Cymophane, or chatoyant chrysoberyl, may also be asteriated.

Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 |Various
The cymophane, whose azure waves float over the milky tint swimming in its depths.

Against The Grain |Joris-Karl Huysmans

cymophane

/ (ˈsaɪməˌfeɪn) /

a yellow or green opalescent variety of chrysoberyl

C19: from Greek kuma wave, undulation + -phane