data_Bi2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.75
_cell_length_b   6.75
_cell_length_c   6.75
_cell_angle_alpha   30.06
_cell_angle_beta   30.06
_cell_angle_gamma   30.06
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Bi2C
_chemical_formula_sum   'Bi2 C1'
_cell_volume   68.42
_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
  Bi  Bi0  1  0.0  0.0  0.9  1.0
  Bi  Bi1  1  0.0  0.0  0.43  1.0
  C  C2  1  0.0  0.0  0.0  1.0

data_Bi2C
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.07
_cell_length_b   3.5
_cell_length_c   6.75
_cell_angle_alpha   90.0
_cell_angle_beta   107.43
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Bi2C
_chemical_formula_sum   'Bi4 C2'
_cell_volume   136.84
_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
  Bi  Bi0  2  0.0  0.0  0.57  1.0
  Bi  Bi1  2  0.0  0.0  0.1  1.0
  C  C2  2  0.0  0.0  0.0  1.0

Bi Bi C
Bi Bi C 0 2 o o + 0 1 o o + 0 1 o o o 1 2 o - + 1 2 - o + 1 2 o o o 1 2 o o + 1 1 o + - 1 1 + - o 1 1 + o - 