data_global
_amcsd_formula_title 'Ge4 K6 Nb6 O26'
loop_
_publ_author_name
'Choisnet J'
'Nguyen N'
'Raveau B'
_journal_name_full 'Revue de Chimie Minerale'
_journal_volume 14 
_journal_year 1977
_journal_page_first 311
_journal_page_last 317
_publ_section_title
;
 Etude du comportement du germanium dans les structures a tunnels de
 section pentagonale: Les silicogermanates K6 Nb6 Gex Si4-x O26
 _cod_database_code 1001302
;
_database_code_amcsd 0015382
_chemical_formula_sum 'K3 Ge2 Nb3 O13'
_cell_length_a 9.188
_cell_length_b 9.188
_cell_length_c 8.123
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 593.867
_exptl_crystal_density_diffrn      4.190
_symmetry_space_group_name_H-M 'P -6 2 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,z'
  '-x+y,-x,-z'
  'y,x,-z'
  '-y,x-y,z'
  'x-y,-y,z'
  'x,y,-z'
  '-x,-x+y,-z'
  '-x+y,-x,z'
  'y,x,z'
  '-y,x-y,-z'
  'x-y,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K1   0.61000   0.00000   0.50000
K2   0.59900   0.00000   0.00000
Ge1   0.33333   0.66667   0.21900
Nb1   0.23200   0.00000   0.23900
O1   0.33333   0.66667   0.00000
O2   0.22800   0.00000   0.00000
O3   0.83100   0.00000   0.29200
O4   0.47800   0.16600   0.28000
O5   0.25600   0.00000   0.50000