data_[K4Mg4Nb4O60]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Mg  1.3100  1.5000  0.8600
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [9.3569]
_cell_length_b [12.6349]
_cell_length_c [13.5271]
_cell_angle_alpha [90.0000]
_cell_angle_beta [119.6219]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [KMgNbO15]
_chemical_formula_sum '[K4 Mg4 Nb4 O60]'
_cell_volume [1390.2154]
_cell_formula_units_Z [4]
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  0.0418  0.5317  0.7297  1
  Mg  Mg1  2  0.5000  0.0000  0.0000  1
  Mg  Mg2  2  0.5000  0.0000  0.5000  1
  Nb  Nb3  4  0.1526  0.2425  0.0820  1
  O  O4  4  0.0341  0.2462  0.6827  1
  O  O5  4  0.0476  0.2353  0.9114  1
  O  O6  4  0.0730  0.7158  0.4231  1
  O  O7  4  0.1320  0.0896  0.5994  1
  O  O8  4  0.1838  0.0858  0.1136  1
  O  O9  4  0.2158  0.2321  0.4591  1
  O  O10  4  0.2618  0.0014  0.9550  1
  O  O11  4  0.2787  0.0530  0.4150  1
  O  O12  4  0.2852  0.6221  0.2635  1
  O  O13  4  0.2903  0.1213  0.6640  1
  O  O14  4  0.2909  0.0732  0.8901  1
  O  O15  4  0.3144  0.6366  0.9713  1
  O  O16  4  0.3351  0.1443  0.1830  1
  O  O17  4  0.3897  0.6513  0.9146  1
  O  O18  4  0.4144  0.6238  0.3563  1
]