...Under the microscope these four lancets differ in thickness, two are very thick, the third is slender, but the fourth, of an opal colour and almost transparent, is exceedingly fine... 
Henry M. Stanley 「How I Found Livingstone」
...Only a small, indefatigable cluster remain, suspended in infinite opal...
Maurice Maeterlinck 「The Life of the Bee」
...Agold necklace and a pair of opal earrings were found in theearth which filled the grave...
Rodolfo Lanciani 「Pagan and Christian Rome」
...When Ruth attacked you afteryou placed the opal head-piece upon her head, she was for the momentmerely another of the invaders' servants blindly obeying the broadcastcommand to kill...
Various 「Astounding Stories, May, 1931」
...Within the ship that waslifting them, they turned to watch a city of opal light grow faintlyluminous in the distance ...
Various 「Astounding Stories, February, 1931」
...The ship was rising beneath them;the opal and quartz of the city’s wallswere flashing swiftly down...
Various 「Astounding Stories of Super-Science, December 1930」
...As the titanic jet leapedskyward now, the slanting rays of thesun caught it, and turned the water,fanning out, into a fire opal, into asheet of living color...
Various 「Astounding Stories of Super-Science, December 1930」
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