data_[K4Ta4Si4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Ta  1.5000  1.4500  0.8200
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [7.0266]
_cell_length_b [9.0909]
_cell_length_c [7.5294]
_cell_angle_alpha [90.0000]
_cell_angle_beta [116.3082]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [KTaSiO5]
_chemical_formula_sum '[K4 Ta4 Si4 O20]'
_cell_volume [431.1427]
_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  0.0000  0.3304  0.7500  1.0
  Ta  Ta1  4  0.0000  0.0000  0.0000  1.0
  Si  Si2  4  0.0000  0.3132  0.2500  1.0
  O  O3  8  0.0776  0.2062  0.1153  1.0
  O  O4  8  0.1979  0.4235  0.3893  1.0
  O  O5  4  0.0000  0.0567  0.7500  1.0
]