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 = 35 kbar
_database_code_amcsd 0012925
4.7406 4.7406 12.9326 90 90 120 R-3c
atom     x y     z Biso
Al       0 0 .3520  .26
O    .3074 0   .25  .76