Sillimanite Burt J B, Ross N L, Angel R J, Koch M American Mineralogist 91 (2006) 319-326 Equations of state and structures of andalusite to 9.8 GPa and sillimanite to 8.5 GPa Locality: Okkamitiya Sabaragamuiwa province, Sri Lanka Sample: P = 1.548 GPa _database_code_amcsd 0004110 7.46040 7.6395 5.75840 90 90 90 Pbnm atom x y z Biso Al1 0 0 0 .40 Al2 .14164 .3439 .25 .49 Si .15356 .3414 .75 .37 OA .3614 .4054 .75 .41 OB .3562 .4337 .25 .44 OC .4756 .0040 .75 .94 OD .1261 .2223 .5148 .61