Corundum

Definition of Corundum

Co`run´dum   Pronunciation: kô`rŭn´dŭm
n.1.(Min.) The mineral alumina (Al2O3), as found native in a crystalline state. Transparent varieties are used as gemstones, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.

Related Words

alumina, aluminium oxide, aluminum oxide, corundom, emery, mineral, ruby, sapphire
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