data_[K6Mn6Nb2O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Mn  1.5500  1.4000  0.6483
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [10.8368]
_cell_length_b [6.5144]
_cell_length_c [7.3084]
_cell_angle_alpha [90.0000]
_cell_angle_beta [121.3938]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [K3Mn3NbO8]
_chemical_formula_sum '[K6 Mn6 Nb2 O16]'
_cell_volume [440.4130]
_cell_formula_units_Z [2]
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
[
  K  K0  4  0.2500  0.2500  0.0000  1
  K  K1  2  0.0000  0.5000  0.0000  1
  Mn  Mn2  4  0.2500  0.2500  0.5000  1
  Mn  Mn3  2  0.0000  0.0000  0.5000  1
  Nb  Nb4  2  0.0000  0.5000  0.5000  1
  O  O5  8  0.0349  0.2714  0.3350  1
  O  O6  4  0.2115  0.5000  0.6998  1
  O  O7  4  0.2299  0.0000  0.6489  1
]