data_RbC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.99
_cell_length_b   5.99
_cell_length_c   5.99
_cell_angle_alpha   54.52
_cell_angle_beta   54.52
_cell_angle_gamma   54.52
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbC2
_chemical_formula_sum   'Rb1 C2'
_cell_volume   132.75
_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
  Rb  Rb2  1  0.0  0.0  0.26  1.0
  C  C0  1  0.0  0.0  0.6  1.0
  C  C1  1  0.0  0.0  0.75  1.0

data_RbC2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   9.51
_cell_length_b   5.49
_cell_length_c   5.99
_cell_angle_alpha   90.0
_cell_angle_beta   121.93
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   RbC2
_chemical_formula_sum   'Rb2 C4'
_cell_volume   265.51
_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
  Rb  Rb0  2  0.0  0.0  0.26  1.0
  C  C1  2  0.0  0.0  0.6  1.0
  C  C2  2  0.0  0.0  0.75  1.0

Rb C C
Rb C C 0 1 o o o 1 2 o o o 