data_[K8Mg4O8]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pbcn]
_cell_length_a [10.4510]
_cell_length_b [6.1136]
_cell_length_c [5.5705]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [60]
_chemical_formula_structural [K2MgO2]
_chemical_formula_sum '[K8 Mg4 O8]'
_cell_volume [355.9131]
_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  8  0.1558  0.3770  0.9430  1.0
  Mg  Mg1  4  0.0000  0.0121  0.2500  1.0
  O  O2  8  0.0936  0.1794  0.5067  1.0
]