data_global
_amcsd_formula_title 'Ca0.75 K6.5 Nb14 O47 Si4'
loop_
_publ_author_name
'Borel M'
'Chardon J'
'Grandin A'
'Leclaire A'
'Raveau B'
_journal_name_full 'Acta Crystallographica, Section C'
_journal_volume 49 
_journal_year 1993
_journal_page_first 570
_journal_page_last 571
_publ_section_title
;
 Structure of a new siliconiobate K6.5 Ca0.75 Nb14 Si4 O47
 _cod_database_code 1001861
;
_database_code_amcsd 0010283
_chemical_formula_sum 'Nb14 Si4 K6.5 Ca.75 O47'
_cell_length_a 9.046
_cell_length_b 9.046
_cell_length_c 27.883
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 1975.983
_exptl_crystal_density_diffrn      4.116
_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
_atom_site_occupancy
Nb1   0.24520   0.00000   0.04437   1.00000
Nb2   0.23777   0.00000   0.18222   1.00000
Nb3   0.33333   0.66667   0.00000   1.00000
Si1   0.33333   0.66667   0.19176   1.00000
K1   0.59240   0.00000   0.10739   1.00000
K2   0.60180   0.00000   0.25000   0.16670
Ca1   0.60180   0.00000   0.25000   0.25000
O1   0.21720   0.00000   0.11060   1.00000
O2   0.27520   0.00000   0.25000   1.00000
O3   0.19730   0.00000   0.53280   1.00000
O4   0.17440   0.00000   0.68620   1.00000
O5   0.33333   0.66667   0.25000   1.00000
O6   0.18170   0.48560   0.17310   1.00000
O7   0.16840   0.48150   0.45840   1.00000