data_[Er4Mg2Np2O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Er  1.2400  1.7500  1.0300
  Mg  1.3100  1.5000  0.8600
  Np  1.3600  1.7500  1.0000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cmmm]
_cell_length_a [6.9474]
_cell_length_b [7.1670]
_cell_length_c [6.7956]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [65]
_chemical_formula_structural [Er2MgNpO8]
_chemical_formula_sum '[Er4 Mg2 Np2 O16]'
_cell_volume [338.3675]
_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
[
  Er  Er0  4  0.0000  0.5000  0.2595  1
  Mg  Mg1  2  0.0000  0.0000  0.5000  1
  Np  Np2  2  0.0000  0.0000  0.0000  1
  O  O3  8  0.0000  0.1843  0.2260  1
  O  O4  4  0.2081  0.5000  0.5000  1
  O  O5  4  0.2088  0.5000  0.0000  1
]