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 = 57 kbar _database_code_amcsd 0001043 9.127 9.127 9.064 90 90 120 P6/mcc atom x y z Biso Be .5 0 .25 .8 Al 1/3 2/3 .25 1.0 Si .3893 .1166 0 .95 O1 .3107 .2366 0 .30 O2 .4992 .1452 .1470 .72