Corundum d'Amour H, Schiferl D, Denner W, Schulz H, Holzapfel W B Journal of Applied Physics 49 (1978) 4411-4416 High-pressure single-crystal structure determinations for ruby up to 90 kbar using an automatic diffractometer P = 28 kbar _database_code_amcsd 0012915 4.7517 4.7517 12.965 90 90 120 R-3c atom x y z Biso Al 0 0 .3520 .14 O .306 0 .25 .22