data_[K2Sm2Si2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Sm  1.1700  1.8500  1.2290
  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 [5.7256]
_cell_length_b [5.6704]
_cell_length_c [7.3651]
_cell_angle_alpha [90.0000]
_cell_angle_beta [104.8594]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KSmSiO4]
_chemical_formula_sum '[K2 Sm2 Si2 O8]'
_cell_volume [231.1223]
_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
[
  K  K0  2  0.3145  0.7500  0.0789  1.0
  Sm  Sm1  2  0.2202  0.7500  0.5494  1.0
  Si  Si2  2  0.2461  0.2500  0.3319  1.0
  O  O3  4  0.0585  0.0226  0.3110  1.0
  O  O4  2  0.4185  0.2500  0.5506  1.0
  O  O5  2  0.4300  0.2500  0.1949  1.0
]