data_global _amcsd_formula_title 'Rb2Ge4O9' loop_ _publ_author_name 'Goreaud M' 'Raveau B' _journal_name_full 'Acta Crystallographica, Section B' _journal_volume 32 _journal_year 1976 _journal_page_first 1536 _journal_page_last 1540 _publ_section_title ; Structure cristalline de Rb2Ge4O9 et Rb2TiGe3O9 de type tetragermanate et etude structurale comparee de germanates en anneaux _cod_database_code 1001001 ; _database_code_amcsd 0009562 _chemical_formula_sum 'Rb2 Ge4 O9' _cell_length_a 12.08 _cell_length_b 12.08 _cell_length_c 9.86 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1246.067 _exptl_crystal_density_diffrn 4.840 _symmetry_space_group_name_H-M 'P -3 c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '-y,-x,1/2+z' 'y,-x+y,-z' '-x,-x+y,1/2-z' '-x+y,-x,z' '-x+y,y,1/2+z' '-x,-y,-z' 'y,x,1/2-z' '-y,x-y,z' 'x,x-y,1/2+z' 'x-y,x,-z' 'x-y,-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Rb1 0.00400 0.33870 0.43030 Ge1 0.00000 0.00000 0.00000 Ge2 0.33333 0.66660 0.47050 Ge3 0.00000 0.17550 0.75000 Ge4 0.15000 0.48240 0.72010 O1 0.00000 0.47730 0.75000 O2 0.07240 0.14800 0.88210 O3 0.11900 0.32600 0.67800 O4 0.24960 0.51990 0.85840 O5 0.18320 0.57840 0.57740