data_global
_amcsd_formula_title 'Na4Ge9O20'
loop_
_publ_author_name
'Fleet M E'
_journal_name_full 'Acta Crystallographica, Section C'
_journal_volume 46 
_journal_year 1990
_journal_page_first 1202
_journal_page_last 1204
_publ_section_title
;
 Refinement of the structure of sodium enneagermanate (Na4Ge9O20)
;
_database_code_amcsd 0010155
_chemical_formula_sum 'Na4 Ge8.5 O20'
_cell_length_a 15.0263
_cell_length_b 15.0263
_cell_length_c 7.3971
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1670.189
_exptl_crystal_density_diffrn      4.093
_symmetry_space_group_name_H-M 'I 41/a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  '3/4+y,1/4-x,1/4-z'
  '1/4+y,3/4-x,3/4-z'
  '3/4-y,1/4+x,1/4+z'
  '1/4-y,3/4+x,3/4+z'
  '1/2+x,y,1/2-z'
  '+x,1/2+y,-z'
  '1/2-x,-y,1/2+z'
  '-x,1/2-y,+z'
  '3/4-y,3/4+x,3/4-z'
  '1/4-y,1/4+x,1/4-z'
  '3/4+y,3/4-x,3/4+z'
  '1/4+y,1/4-x,1/4+z'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Na   0.08666   0.05566   0.16931   1.00000   0.02546
Ge1   0.00000   0.25000   0.12500   0.50000   0.00667
Ge2   0.13657   0.04603   0.70097   1.00000   0.00684
Ge3   0.09568   0.21773   0.49080   1.00000   0.00645
O1   0.09204   0.21194   0.24544   1.00000   0.01014
O2   0.08005   0.22213   0.74549   1.00000   0.00830
O3   0.18871   0.07324   0.90670   1.00000   0.01035
O4   0.02503   0.04537   0.75873   1.00000   0.01074
O5   0.15385   0.10846   0.50551   1.00000   0.00999