Beryl Hazen R M, Au A Y, Finger L W American Mineralogist 71 (1986) 977-984 High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH) Sample: Pressure = 18 kbar _database_code_amcsd 0001041 9.179 9.179 9.157 90 90 120 P6/mcc atom x y z Biso Be .5 0 .25 .3 Al 1/3 2/3 .25 .9 Si .3882 .1155 0 .68 O1 .3122 .2376 0 .58 O2 .4987 .1459 .1449 .78