Corundum Finger L W, Hazen R M Journal of Applied Physics 49 (1978) 5823-5826 Crystal structure and compression of ruby to 46 kbar P = 0.001 kbar _database_code_amcsd 0012921 4.7607 4.7607 12.9947 90 90 120 R-3c atom x y z Biso Al 0 0 .35216 .31 O .3061 0 .25 .33