data_BiC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.54
_cell_length_b   9.54
_cell_length_c   2.8
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   152.05
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BiC2
_chemical_formula_sum   'Bi2 C4'
_cell_volume   119.31
_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
  Bi  Bi0  1  0.3  0.75  0.1  1.0
  Bi  Bi1  1  0.3  0.25  0.7  1.0
  C  C2  1  0.3  0.26  0.1  1.0
  C  C3  1  0.3  0.19  0.1  1.0
  C  C4  1  0.3  0.81  0.7  1.0
  C  C5  1  0.3  0.74  0.7  1.0

data_BiC2
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.8
_cell_length_b   4.61
_cell_length_c   9.54
_cell_angle_alpha   103.97
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   BiC2
_chemical_formula_sum   'Bi2 C4'
_cell_volume   119.31
_cell_formula_units_Z   2
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
  Bi  Bi0  2  0.3  0.75  0.75  1.0
  C  C1  2  0.3  0.19  0.19  1.0
  C  C2  2  0.3  0.26  0.26  1.0

Bi Bi C C C C
Bi Bi C C C C 0 4 o o - 0 5 o o - 1 2 o o + 1 3 o o + 2 3 o o o 4 5 o o o 