http://wordie.org/words/corundum Comments for the word 'Corundum' http://wordie.org http://wordie.org/words/corundum#comments a crystalline form of aluminium oxide and one of the rock-forming minerals. It is naturally clear, but can have different colors when impurities are present. Fri, 18 Jul 2008 08:27:19 +0000 http://wordie.org/words/corundum#comments