data_[Ca4C4O12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  C  2.5500  0.7000  0.3000
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Ama2]
_cell_length_a [8.5291]
_cell_length_b [6.5433]
_cell_length_c [4.5984]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [40]
_chemical_formula_structural [CaCO3]
_chemical_formula_sum '[Ca4 C4 O12]'
_cell_volume [256.6303]
_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  4  0.0000  0.0000  0.5009  1.0
  C  C1  4  0.2500  0.1438  0.0543  1.0
  O  O2  8  0.1161  0.1687  0.9231  1.0
  O  O3  4  0.2500  0.0984  0.3285  1.0
]