Corundum



[kuh-ruhn-duh m] /kəˈrʌn dəm/

noun
1.
a common mineral, aluminum oxide, Al 2 O 3 , notable for its hardness: transparent varieties, as sapphire and ruby, are used as gems, other varieties as abrasives: often made synthetically.
/kəˈrʌndəm/
noun
1.
a white, grey, blue, green, red, yellow, or brown mineral, found in metamorphosed shales and limestones, in veins, and in some igneous rocks. It is used as an abrasive and as gemstone; the red variety is ruby, the blue is sapphire. Composition: aluminium oxide. Formula: Al2O3. Crystal structure: hexagonal (rhombohedral)
n.

“very hard mineral,” 1728, from Anglo-Indian, from Tamil kurundam “ruby sapphire” (Sanskrit kuruvinda), of unknown origin.
corundum
(kə-rŭn’dəm)
An extremely hard mineral occurring in many colors, either as shapeless grains or as rhombohedral crystals. It also occurs in gem varieties such as ruby and sapphire and in a dark-colored variety that is used for polishing and scraping. Corundum is found in igneous and carbonate rocks. Chemical formula: Al2O3.

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