...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」
..." A selection of the best opal beads was immediately given him...
Samuel White Baker 「In the Heart of Africa」
...Its opal box, the hard rind of the berry, has ensured its safetyjust as well as a filthy overcoat would have done and perhaps evenbetter...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...The Crioceris has found safety inside its opal globe...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
...A weird and splendid sight was that sheer arc ofshimmering white flame, roaring into a pool of opal light, andsurrounded with a mist of moon-flame...
Various 「Astounding Stories, April, 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」
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