data_KRb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.37
_cell_length_b   8.37
_cell_length_c   8.37
_cell_angle_alpha   33.75
_cell_angle_beta   33.75
_cell_angle_gamma   33.75
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KRb
_chemical_formula_sum   'K1 Rb1'
_cell_volume   161.24
_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
  K  K0  1  0.0  0.0  0.0  1.0
  Rb  Rb1  1  0.0  0.0  0.83  1.0

data_KRb
_symmetry_space_group_name_H-M   Cm
_cell_length_a   8.42
_cell_length_b   4.86
_cell_length_c   8.37
_cell_angle_alpha   90.0
_cell_angle_beta   109.58
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   KRb
_chemical_formula_sum   'K2 Rb2'
_cell_volume   322.48
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  K  K0  2  0.0  0.0  0.0  1.0
  Rb  Rb1  2  0.0  0.0  0.17  1.0

K Rb