data_[Tm8Si4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  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/c]
_cell_length_a [8.9498]
_cell_length_b [6.7313]
_cell_length_c [6.5871]
_cell_angle_alpha [90.0000]
_cell_angle_beta [104.9777]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Tm2SiO5]
_chemical_formula_sum '[Tm8 Si4 O20]'
_cell_volume [383.3480]
_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
[
  Tm  Tm0  4  0.1301  0.1387  0.9530  1
  Tm  Tm1  4  0.4707  0.1249  0.7686  1
  Si  Si2  4  0.2011  0.5921  0.9777  1
  O  O3  4  0.1061  0.7080  0.4876  1
  O  O4  4  0.1249  0.0555  0.2819  1
  O  O5  4  0.2102  0.0700  0.6712  1
  O  O6  4  0.3866  0.1175  0.0654  1
  O  O7  4  0.3881  0.6377  0.0087  1
]