data_[Na2Tm1Cr1Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Tm  1.2500  1.7500  1.0950
  Cr  1.6600  1.4000  0.9400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2/m]
_cell_length_a [6.7765]
_cell_length_b [3.9503]
_cell_length_c [7.3462]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.2184]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [10]
_chemical_formula_structural [Na2TmCrSe4]
_chemical_formula_sum '[Na2 Tm1 Cr1 Se4]'
_cell_volume [186.7937]
_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
[
  Na  Na0  1  0.0000  0.5000  0.5000  1.0
  Na  Na1  1  0.5000  0.0000  0.5000  1.0
  Tm  Tm2  1  0.0000  0.0000  0.0000  1.0
  Cr  Cr3  1  0.5000  0.5000  0.0000  1.0
  Se  Se4  2  0.2600  0.5000  0.2216  1.0
  Se  Se5  2  0.2858  0.0000  0.7927  1.0
]