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 = 21 kbar
_database_code_amcsd 0012923
4.7474 4.7474 12.9542 90 90 120 R-3c
atom     x y      z Biso
Al       0 0 .35201  .31
O    .3057 0    .25  .59