I-Alumina iyinto engajwayelekile enefomula yamakhemikhali i-Al2O3. Kuyinhlanganisela enobunzima obukhulu. Inendawo yokuncibilika engu-2054 ° C nendawo ebilayo engu - 2980 ° C. Inama-heterocrystals amaningi afanayo.