KnowraCorundumLinked fromLinked fromThe 11 pages that link to Corundum, each with the reason it gives.All 11Broader topic 6Narrower topic 1Compared with 4Mohs scaleBroader topic: It sits just below diamond among the scale’s reference minerals.AluminaBroader topic: This stable crystal structure underlies many dense alumina ceramics.Aluminium oxideBroader topic: This structure is the basis of aluminium oxide's exceptional hardness.Trigonal crystal systemBroader topic: Its structure is a prominent trigonal example beyond silicate minerals.Rhombohedral crystal systemBroader topic: Its symmetry illustrates the trigonal crystal family associated with rhombohedral lattices.Oxide mineralBroader topic: Corundum shows how a single oxide species can occur as both an industrial abrasive and a gemstone.