data_[Ca8Se4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [4.0335]
_cell_length_b [11.2749]
_cell_length_c [10.2307]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Ca2SeO5]
_chemical_formula_sum '[Ca8 Se4 O20]'
_cell_volume [465.2700]
_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
[
  Ca  Ca0  8  0.0000  0.1441  0.5773  1
  Se  Se1  4  0.0000  0.1617  0.2500  1
  O  O2  8  0.0000  0.0534  0.1270  1
  O  O3  8  0.0000  0.2752  0.1204  1
  O  O4  4  0.0000  0.2997  0.7500  1
]