data_[Rb4Na4Ac2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Na  0.9300  1.8000  1.1600
  Ac  1.1000  1.9500  1.2600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [13.3419]
_cell_length_b [3.9105]
_cell_length_c [9.4182]
_cell_angle_alpha [90.0000]
_cell_angle_beta [128.6851]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Na2AcO4]
_chemical_formula_sum '[Rb4 Na4 Ac2 O8]'
_cell_volume [383.5707]
_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  0.1725  0.0000  0.7784  1
  Na  Na1  4  0.1490  0.5000  0.3778  1
  Ac  Ac2  2  0.0000  0.0000  0.0000  1
  O  O3  4  0.0630  0.5000  0.8965  1
  O  O4  4  0.2066  0.0000  0.3034  1
]