Na4Ge9O20 Fleet M E Acta Crystallographica C46 (1990) 1202-1204 Refinement of the structure of sodium enneagermanate (Na4Ge9O20) _database_code_amcsd 0010155 15.0263 15.0263 7.3971 90 90 90 *I4_1/a 0 .25 .125 atom x y z occ Biso Na .08666 .05566 .16931 2.010 Ge1 0 .25 .125 .5 .527 Ge2 .13657 .04603 .70097 .540 Ge3 .09568 .21773 .49080 .509 O1 .09204 .21194 .24544 .801 O2 .08005 .22213 .74549 .655 O3 .18871 .07324 .90670 .817 O4 .02503 .04537 .75873 .848 O5 .15385 .10846 .50551 .789