I-corundum emhlophe, eyaziwa ngokuba yi-aluminium oxide emhlophe, luhlobo lwekristale lwe-aluminiyam oxide ehlala imhlophe okanye icacile ngombala.Inomlinganiselo wobulukhuni be-Mohs we-9.0 kwaye idume ngobulukhuni obuphezulu kunye nokuqina kwayo, iyenza ilungele ukusetyenziswa kwimveliso yesixhobo esichanekileyo, ukusetyenzwa kwezinto ezinxitywayo, kunye nezicelo zokugqiba umphezulu.I-corundum emhlophe yenziwe kwizinto ezikumgangatho ophezulu ze-bauxite ezifakwe kwi-calcined ngeteknoloji ephezulu.Kukho iintlobo ezimbini eziphambili ze-corundum emhlophe: i-fused kunye ne-sintered.Ngaphandle kokungafani kwazo, zombini ezi ntlobo zibonelela ngeepropati eziphezulu eziye zabavumela ukuba bafumane indawo evelele kumashishini amaninzi.