data_[K2Mg2Ag2F8]
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
  Ag  1.9300  1.6000  1.0867
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [I4mm]
_cell_length_a [3.9787]
_cell_length_b [3.9787]
_cell_length_c [12.9407]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [107]
_chemical_formula_structural [KMgAgF4]
_chemical_formula_sum '[K2 Mg2 Ag2 F8]'
_cell_volume [204.8538]
_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  2  0.0000  0.0000  0.3495  1.0
  Mg  Mg1  2  0.0000  0.0000  0.0017  1.0
  Ag  Ag2  2  0.0000  0.0000  0.6518  1.0
  F  F3  4  0.0000  0.5000  0.0005  1.0
  F  F4  2  0.0000  0.0000  0.1552  1.0
  F  F5  2  0.0000  0.0000  0.8408  1.0
]