Sillimanite Yang H, Hazen R M, Finger L W, Prewitt C T, Downs R T Physics and Chemistry of Minerals 25 (1997) 39-47 Compressibility and crystal structure of sillimanite, Al2SiO5, at high pressure Sample: P = 0.00 GPa _database_code_amcsd 0008107 7.4857 7.6750 5.7751 90 90 90 Pbnm atom x y z Biso Al1 0 0 0 .37 Al2 .1417 .3452 .25 .44 Si .1532 .3404 .75 .42 OA .3602 .4089 .75 .52 OB .3566 .4339 .25 .55 OC .4767 .0009 .75 .91 OD .1255 .2232 .5145 .63