Chrysoberyl Hazen R M, Finger L W Physics and Chemistry of Minerals 14 (1987) 426-434 High-temperature crystal chemistry of phenakite (Be2SiO4) and Chrysoberyl (BeAl2O4) Sample: T = 490 C _database_code_amcsd 0007445 4.438 9.429 5.492 90 90 90 Pbnm atom x y z Biso Al1 0 0 0 .54 Al2 .9950 .27332 .25 .43 Be .4353 .0929 .25 .84 O1 .7883 .0904 .25 .57 O2 .2424 .4330 .25 .59 O3 .2576 .1628 .0156 .61