MnCaGe Pearson W B Zeitschrift fur Kristallographie 171 (1985) 23-39 The Cu2Sb and related structures _database_code_amcsd 0010919 4.23 4.23 7.27 90 90 90 P4/nmm atom x y z Mn 0 0 0 Ca .5 0 .6616 Ge .5 0 .2197