Corundum

Co*run"dum

(k*rn"dm), n.;
pl. Corundums (k*rn"dmz).
[Also corindon.] [From Hind. kurand corundum stone.] (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.
[1913 Webster +PJC]

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.
[1913 Webster]

 

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Sun 16th December 2018