data_[Na2Tm2Si2O8]
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
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [5.6325]
_cell_length_b [5.5331]
_cell_length_c [6.8353]
_cell_angle_alpha [90.0000]
_cell_angle_beta [92.2740]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaTmSiO4]
_chemical_formula_sum '[Na2 Tm2 Si2 O8]'
_cell_volume [212.8519]
_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
[
  Na  Na0  2  0.3882  0.7500  0.1293  1.0
  Tm  Tm1  2  0.1964  0.7500  0.5646  1.0
  Si  Si2  2  0.3039  0.2500  0.3416  1.0
  O  O3  4  0.1173  0.0186  0.3239  1.0
  O  O4  2  0.4334  0.2500  0.5611  1.0
  O  O5  2  0.4781  0.7500  0.8097  1.0
]