data_[Rb4Tb8Cu8O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Tb  1.1000  1.7500  0.9815
  Cu  1.9000  1.3500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.9353]
_cell_length_b [3.4704]
_cell_length_c [13.9522]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.4403]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Tb4Cu4O9]
_chemical_formula_sum '[Rb4 Tb8 Cu8 O18]'
_cell_volume [548.2230]
_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
[
  Rb  Rb0  4  0.0215  0.5000  0.2792  1
  Tb  Tb1  4  0.1521  0.0000  0.5524  1
  Tb  Tb2  4  0.2288  0.5000  0.1070  1
  Cu  Cu3  4  0.0474  0.0000  0.9324  1
  Cu  Cu4  4  0.2458  0.0000  0.2774  1
  O  O5  4  0.1216  0.0000  0.1345  1
  O  O6  4  0.1535  0.5000  0.9309  1
  O  O7  4  0.1635  0.0000  0.7208  1
  O  O8  4  0.2162  0.0000  0.4138  1
  O  O9  2  0.0000  0.5000  0.5000  1
]