data_[Rb4Sr2Mg2Sb4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Sr  0.9500  2.0000  1.3200
  Mg  1.3100  1.5000  0.8600
  Sb  2.0500  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [5.1127]
_cell_length_b [10.3054]
_cell_length_c [8.3959]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [Rb2SrMgSb2]
_chemical_formula_sum '[Rb4 Sr2 Mg2 Sb4]'
_cell_volume [442.3645]
_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  2  0.0000  0.1602  0.6656  1.0
  Rb  Rb1  2  0.5000  0.0871  0.9817  1.0
  Sr  Sr2  2  0.0000  0.4576  0.9998  1.0
  Mg  Mg3  2  0.5000  0.3326  0.3443  1.0
  Sb  Sb4  2  0.0000  0.2031  0.2535  1.0
  Sb  Sb5  2  0.5000  0.3985  0.7095  1.0
]