data_global
_amcsd_formula_title 'K3 Nb8 O21'
loop_
_publ_author_name
'Benabbas A'
'Borel M'
'Grandin A'
'Leclaire A'
'Raveau B'
_journal_name_full 'Acta Crystallographica, Section C'
_journal_volume 49 
_journal_year 1993
_journal_page_first 439
_journal_page_last 441
_publ_section_title
;
 Single-crystal structure of K3 Nb8 O21
 _cod_database_code 1001860
;
_database_code_amcsd 0010282
_chemical_formula_sum 'Nb8 K3 O21'
_cell_length_a 9.1584
_cell_length_b 9.1584
_cell_length_c 12.0404
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 874.602
_exptl_crystal_density_diffrn      4.544
_symmetry_space_group_name_H-M 'P 63/m c m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,z'
  'x,x-y,-z'
  '-x+y,-x,1/2-z'
  'x-y,x,1/2+z'
  '-y,-x,1/2+z'
  'y,x,1/2-z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x-y,-y,z'
  '-x+y,y,-z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  'x,x-y,1/2+z'
  '-x,-x+y,1/2-z'
  'x-y,x,-z'
  '-x+y,-x,z'
  'y,x,z'
  '-y,-x,-z'
  '-y,x-y,1/2-z'
  'y,-x+y,1/2+z'
  '-x+y,y,1/2+z'
  'x-y,-y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Nb1   0.66667   0.33333   0.00000
Nb2   0.24888   0.24888   0.09468
K1   0.59380   0.59380   0.25000
O1   0.48180   0.31430   0.09580
O2   0.20060   0.00000   0.07400
O3   0.20700   0.20700   0.25000