The sun rose above the horizon and flooded the earth with liquid gold; again the sea ran with running light; the melting glaciers shimmered with burning amethystine hues; the snow-covered mountains took fire and glowed with burning bars of chrysoberyl and sapphire, while on the limpid sea the moving bergs glittered like monstrous diamonds electrically white.
"The Eternal Maiden"
T. Everett Harré
This stone shows positive electricity when rubbed, and, unlike the sapphires described in the last chapter, which lose their colour when heated, this variety of chrysoberyl shows no change in colour, and any electricity given to it, either by friction or heat, is retained for a long time.
"The Chemistry, Properties and Tests of Precious Stones"
John Mastin
The cat's-eye of this is very similar to the quartz cat's-eye, but a comparison will make the difference so clear that they could never be mistaken, apart from the fact that the quartz has a specific gravity considerably lower than the chrysoberyl cat's-eye, which latter is the true cat's-eye, and the one usually understood when allusion is made to the stone without any distinguishing prefix, such as the ruby, sapphire, quartz, etc.
"The Chemistry, Properties and Tests of Precious Stones"
John Mastin