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sapphire




sapphire
Any of the gem varieties of corundum except those which, being red are called ruby; blue sapphires are best-known, but most other colors, produced by impurities of iron and titanium, are known. The best sapphires come from Kashmir, Myanmar, Thailand, Sri Lanka, and Australia. Synthetic stones, made by flame-fusion, are used for jewel bearings, phonograph styluses, etc.


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   • GEOLOGY AND PLANETARY SCIENCE