Corundum yera, izwi kandi nka oxyde ya aluminium yera, ni uburyo bwa kirisiti ya aluminium oxyde isanzwe yera cyangwa igaragara neza.Ifite igipimo cya Mohs kingana na 9.0 kandi kizwiho gukomera no gukomera, bigatuma biba byiza gukoreshwa mugukora ibikoresho byuzuye, gutunganya ibikoresho birinda kwambara, hamwe no kurangiza kubutaka.Corundum yera ikozwe mubikoresho byiza byo mu bwoko bwa bauxite bibarwa nubuhanga buhanitse.Hariho ubwoko bubiri bwingenzi bwa corundum yera: yahujwe kandi icumura.Nubwo batandukanye, ubwoko bwombi butanga imitungo isumba iyindi yatumye babona umwanya wingenzi mubikorwa byinshi.
