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ruby

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ruby

Red transparent gem variety of the mineral corundum Al2O3, aluminium oxide. Small amounts of chromium oxide, Cr2O3, substituting for aluminium oxide, give ruby its colour. Natural rubies are found mainly in Myanmar (Burma), but rubies can also be produced artificially and such synthetic stones are used in lasers.



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? Mentioned in ? References in classic literature
 
He was gilded all over with thin leaves of fine gold, for eyes he had two bright sapphires, and a large red ruby glowed on his sword-hilt.
But Ruby Gillis says she saw him writing something on her slate and when Prissy read it she blushed as red as a beet and giggled; and Ruby Gillis says she doesn't believe it had anything to do with the lesson.
The winter afternoon was reddening towards evening, and already a ruby light was rolled over the bloomless beds, filling them, as it were, with the ghosts of the dead roses.
 
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