B2 Ca O4 Zachariasen W, Ziegler G Zeitschrift fur Kristallographie 83 (1932) 354-361 The Crystal Structure of Calcium Metaborate Ca B2 O4 _cod_database_code 1010468 _database_code_amcsd 0017385 6.19 11.60 4.28 90 90 90 Pnca atom x y z Ca1 .25 0 .264 B1 .125 .197 .847 O1 .111 .089 .722 O2 .139 .208 .167