![]() The chief corundum gems are the ruby ruby, ![]() Emery is a common corundum, used as an abrasive and distinguished by its impurities of magnetite and hematite. The transparent gem varieties are colorless, pink, red, blue, green, yellow, and violet the common varieties are blue-gray to brown. It is transparent to opaque and has a vitreous to adamantine luster. Corundum occurs in crystals of the hexagonal system and in masses. The clear varieties are used as gems and the opaque as abrasive materials. Corundum (kərŭn`dəm), mineral, aluminum oxide, Al 2O 3.
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