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[kuh -ruhn -duh m]

Definition #1 for "corundum"

very hard mineral used as an abrasive


Definition #2 for "corundum"

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.


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