<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following CIF representation:
data_Er6MnBi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.24
_cell_length_b   8.24
_cell_length_c   4.26
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er6MnBi2
_chemical_formula_sum   'Er6 Mn1 Bi2'
_cell_volume   250.41
_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
  Er  Er0  1  0.92  0.0  0.13  1.0
  Er  Er1  1  0.48  0.36  0.0  1.0
  Er  Er2  1  0.6  0.78  0.0  1.0
  Er  Er3  1  0.16  0.48  0.13  1.0
  Er  Er4  1  0.04  0.66  0.13  1.0
  Er  Er5  1  0.03  0.0  0.0  1.0
  Mn  Mn6  1  0.0  0.0  0.0  1.0
  Bi  Bi7  1  0.0  0.76  0.13  1.0
  Bi  Bi8  1  0.12  0.38  0.13  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_Er6MnBi2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.24
_cell_length_b   8.24
_cell_length_c   4.26
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er6MnBi2
_chemical_formula_sum   'Er6 Mn1 Bi2'
_cell_volume   250.41
_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
  Er  Er0  1  0.92  0.0  0.13  1.0
  Er  Er1  1  0.48  0.36  0.0  1.0
  Er  Er2  1  0.6  0.78  0.0  1.0
  Er  Er3  1  0.16  0.48  0.13  1.0
  Er  Er4  1  0.04  0.66  0.13  1.0
  Er  Er5  1  0.03  0.0  0.0  1.0
  Mn  Mn6  1  0.0  0.0  0.0  1.0
  Bi  Bi7  1  0.0  0.76  0.13  1.0
  Bi  Bi8  1  0.12  0.38  0.13  1.0

What is the crystal system of this material?