I-spinel iyimaminerali eyakhiwe nge-magnesium ne-aluminium oxide, ngoba iqukethe i-magnesium, insimbi, i-zinc, i-manganese nezinye izakhi, zingahlukaniswa zibe izinhlobo eziningi, njenge-aluminium spinel, i-iron spinel, i-zinc spinel, i-manganese spinel, i-chrome spinel kanye njalonjalo.