AM_Corundum_8 Formula: Al2 O3 Name: Corundum Unit cell: 4.7418 4.7418 12.921 90.0 90.0 120.0 , V=251.60 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 = 42 kbar