data_global
_amcsd_formula_title 'K3Nb3B2O12'
loop_
_publ_author_name
'Choisnet J'
'Groult D'
'Raveau B'
'Gasperin M'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 33 
_journal_year 1977
_journal_page_first 1841
_journal_page_last 1845
_publ_section_title
;
 Nouvelles structures a tunnels de section pentagonale
 K3Nb3B2O12 et K3Ta3B2O12
 _cod_database_code 1001007
;
_database_code_amcsd 0009592
_chemical_formula_sum 'K3 Nb3 O12 B2'
_cell_length_a 8.753
_cell_length_b 8.753
_cell_length_c 3.966
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 263.146
_exptl_crystal_density_diffrn      3.847
_symmetry_space_group_name_H-M 'P 3 1 m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x-y,-y,z'
  '-y,x-y,z'
  'y,x,z'
  '-x+y,-x,z'
  '-x,-x+y,z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K1   0.59640   0.00000   0.49890
Nb1   0.24630   0.00000   0.00000
O1   0.81790   0.00000  -0.00760
O2   0.26060   0.00000   0.49300
O3   0.50300   0.18540  -0.01690
B1   0.33333   0.66667  -0.01880