data_[Rb4Er8Cu4S16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Er  1.2400  1.7500  1.0300
  Cu  1.9000  1.3500  0.8200
  S  2.5800  1.0000  0.8800
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.9536]
_cell_length_b [13.6717]
_cell_length_c [13.7073]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [RbEr2CuS4]
_chemical_formula_sum '[Rb4 Er8 Cu4 S16]'
_cell_volume [740.9101]
_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
[
  Rb  Rb0  4  0.0000  0.1081  0.7500  1.0
  Er  Er1  8  0.0000  0.3661  0.5623  1.0
  Cu  Cu2  4  0.0000  0.1656  0.2500  1.0
  S  S3  8  0.0000  0.2587  0.1068  1.0
  S  S4  4  0.0000  0.0000  0.0000  1.0
  S  S5  4  0.0000  0.4240  0.7500  1.0
]