data_[Rb2Ac1Cr1O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Ac  1.1000  1.9500  1.2600
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2/m]
_cell_length_a [6.0779]
_cell_length_b [3.5690]
_cell_length_c [6.8551]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.1110]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [Rb2AcCrO4]
_chemical_formula_sum '[Rb2 Ac1 Cr1 O4]'
_cell_volume [141.3351]
_cell_formula_units_Z [1]
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  1  0.0000  0.5000  0.5000  1
  Rb  Rb1  1  0.5000  0.0000  0.5000  1
  Ac  Ac2  1  0.5000  0.5000  0.0000  1
  Cr  Cr3  1  0.0000  0.0000  0.0000  1
  O  O4  2  0.1957  0.5000  0.1724  1
  O  O5  2  0.2264  0.0000  0.8244  1
]