Diaoyudaoite Beevers C, Ross M Zeitschrift fur Kristallographie 97 (1937) 59-66 The crystal structure of beta alumina Na2O(Al2O3)11 _cod_database_code 1010017 _database_code_amcsd 0016956 5.584 5.584 22.45 90 90 120 P6_3/mmc atom x y z Na1 2/3 1/3 .25 Al1 0 0 0 Al2 1/3 2/3 .022 Al3 1/3 1/6 .106 Al4 1/3 2/3 .178 O1 1/6 1/3 .05 O2 2/3 1/3 .05 O3 0 0 .144 O4 .5 .5 .144 O5 1/3 2/3 .25