data_Na2SrSb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.12
_cell_length_b   4.12
_cell_length_c   8.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.79
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2SrSb
_chemical_formula_sum   'Na2 Sr1 Sb1'
_cell_volume   139.26
_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
  Na  Na0  1  0.89  0.0  0.37  1.0
  Na  Na1  1  0.0  0.0  0.3  1.0
  Sr  Sr3  1  0.0  0.0  0.73  1.0
  Sb  Sb2  1  0.89  0.0  0.91  1.0

data_Na2SrSb
_symmetry_space_group_name_H-M   Pm
_cell_length_a   4.12
_cell_length_b   4.12
_cell_length_c   8.21
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   6
_chemical_formula_structural   Na2SrSb
_chemical_formula_sum   'Na2 Sr1 Sb1'
_cell_volume   139.27
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '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
  Na  Na0  1  0.0  0.0  0.3  1.0
  Na  Na1  1  0.89  0.0  0.37  1.0
  Sr  Sr2  1  0.0  0.0  0.73  1.0
  Sb  Sb3  1  0.89  0.0  0.91  1.0

Na Na Sr Sb
Na Na Sr Sb 0 1 + o o 2 3 - o o 