data_[Sm4Si4Hg4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sm  1.1700  1.8500  1.2290
  Si  1.9000  1.1000  0.5400
  Hg  2.0000  1.5000  1.2450
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.5623]
_cell_length_b [6.2422]
_cell_length_c [6.9302]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.5001]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [SmSiHgO4]
_chemical_formula_sum '[Sm4 Si4 Hg4 O16]'
_cell_volume [490.1380]
_cell_formula_units_Z [4]
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
[
  Sm  Sm0  4  0.1963  0.5000  0.8497  1.0
  Si  Si1  4  0.1354  0.5000  0.2640  1.0
  Hg  Hg2  4  0.1096  0.0000  0.4909  1.0
  O  O3  8  0.1834  0.2954  0.1479  1.0
  O  O4  4  0.0048  0.5000  0.7463  1.0
  O  O5  4  0.2043  0.5000  0.5014  1.0
]