data_[Ca18Mg6P6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Mg  1.3100  1.5000  0.8600
  P  2.1900  1.0000  0.5500
]
_symmetry_space_group_name_H-M [R3c]
_cell_length_a [8.4679]
_cell_length_b [8.4679]
_cell_length_c [14.9226]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [161]
_chemical_formula_structural [Ca3MgP]
_chemical_formula_sum '[Ca18 Mg6 P6]'
_cell_volume [926.6630]
_cell_formula_units_Z [6]
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
[
  Ca  Ca0  18  0.0976  0.3683  0.2849  1
  Mg  Mg1  6  0.0000  0.0000  0.4274  1
  P  P2  6  0.0000  0.0000  0.2363  1
]