data_[K2Ca2P4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Ca  1.0000  1.8000  1.1400
  P  2.1900  1.0000  0.5500
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [3.9630]
_cell_length_b [3.9057]
_cell_length_c [13.9465]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [KCaP2]
_chemical_formula_sum '[K2 Ca2 P4]'
_cell_volume [215.8711]
_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  0.5000  0.0000  0.1968  1
  Ca  Ca1  2  0.5000  0.0000  0.4403  1
  P  P2  2  0.0000  0.0000  0.0095  1
  P  P3  2  0.0000  0.0000  0.8534  1
]