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corundums |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Corundum \Co*run"dum\ (k?-r?n"d?m), n.; pl {Corundums} (-d?mz). [Also corindon.] [From Hind. kurand corundum stone.] (Min.) The earth alumina, as found native in a crystalline state, 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. Note: The name corundum is sometimes restricted to the non-transparent or coarser kinds. Emery is a dark-colored granular variety, usually admixed with magnetic iron ore.
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