data_[Ca6Ce4Er2N12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Ce  1.1200  1.8500  1.0800
  Er  1.2400  1.7500  1.0300
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [6.1115]
_cell_length_b [10.5984]
_cell_length_c [6.0857]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.4748]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Ca3Ce2ErN6]
_chemical_formula_sum '[Ca6 Ce4 Er2 N12]'
_cell_volume [371.6326]
_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
[
  Ca  Ca0  4  0.0000  0.1648  0.5000  1
  Ca  Ca1  2  0.0000  0.5000  0.5000  1
  Ce  Ce2  4  0.0000  0.3333  0.0000  1
  Er  Er3  2  0.0000  0.0000  0.0000  1
  N  N4  8  0.2426  0.1677  0.2233  1
  N  N5  4  0.2389  0.5000  0.2234  1
]