AM_Corundum_12 Formula: Al2 O3 Name: Corundum Unit cell: 4.7154 4.7154 12.851 90.0 90.0 120.0 , V=247.46 Space group: R-3C (167)

d Amour H , Schiferl D , Denner W , Schulz H , Holzapfel W B , Journal of Applied Physics , 49 (1978) p.4411-4416, High-pressure single-crystal structure determinations for ruby up to 90 kbar, using an automatic diffractometer, P = 90 kbar