I-corundum emhlophe, eyaziwa nangokuthi i-aluminium oxide emhlophe, iwuhlobo lwecrystalline lwe-aluminium oxide ngokuvamile olumhlophe noma olucacile ngombala.Inesilinganiso sobulukhuni be-Mohs esingu-9.0 futhi idume ngobulukhuni bayo obuphezulu nokuqina, okuyenza ilungele ukusetshenziswa ekwenziweni kwamathuluzi anembayo, ukucutshungulwa kwezinto ezingagugi, kanye nezicelo zokuqeda phezulu.I-corundum emhlophe yenziwe ngezinto ezingavuthiwe zekhwalithi ephezulu ze-bauxite ezibalwa ngobuchwepheshe obuphambili.Kunezinhlobo ezimbili eziyinhloko ze-corundum emhlophe: ehlanganisiwe ne-sintered.Naphezu kokuhlukana kwazo, zombili izinhlobo zinikeza izakhiwo eziphakeme ezivumele ukuba zithole indawo evelele ezimbonini eziningi.