data_[Pm4Mg4As4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Mg  1.3100  1.5000  0.8600
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [8.4384]
_cell_length_b [8.9298]
_cell_length_c [7.9845]
_cell_angle_alpha [90.0000]
_cell_angle_beta [118.3579]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [PmMgAsO5]
_chemical_formula_sum '[Pm4 Mg4 As4 O20]'
_cell_volume [529.4619]
_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
[
  Pm  Pm0  4  0.0000  0.0000  0.0000  1
  Mg  Mg1  4  0.0000  0.3229  0.2500  1
  As  As2  4  0.0000  0.3693  0.7500  1
  O  O3  8  0.0037  0.2631  0.5733  1
  O  O4  8  0.1738  0.4988  0.3407  1
  O  O5  4  0.0000  0.1129  0.2500  1
]