Another important variety is that of the chrysoberyl called "cymophane."
Some of these approach the chrysoberyl and topaz in hardness and hue.
Passing on to the next mineral in the scale of hardness we come to chrysoberyl, which is rated as 81⁄2 on Mohs's scale.
chrysoberyl, kris′o-ber-il, n. a mineral of various shades of greenish-yellow or gold colour.
Now and then she sipped of the wine, Lacrymae Christi from Viterbo, of the greenish straw color of the chrysoberyl.
chrysoberyl (alexandrite and also the greenish-yellow chrysoberyl).
Other varieties of chrysoberyl (most of those marketed are of a greenish-yellow color) are correctly named simply "chrysoberyls."
This species furnishes us Alexandrite, chrysoberyl cat's-eye and less valuable chrysoberyls of yellowish-green color.
Then follows the topaz, which, with spinel and chrysoberyl, has a hardness of 8; whilst quartz falls a degree lower.
chrysoberyl is known as a constituent of certain kinds of granite, pegmatite and gneiss.