コランダムコランダムMeanings1nouncorundumA very hard mineral, aluminum oxide, used as an abrasive and in gemstones such as ruby and sapphire. Technical term.コランダムはモース硬こう度ど9の非ひ常じょうに硬かたい鉱こう物ぶつです。Corundum is a very hard mineral with a Mohs hardness of 9.
