data_[Er6Mg3Ta3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Er  1.2400  1.7500  1.0300
  Mg  1.3100  1.5000  0.8600
  Ta  1.5000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [5.5985]
_cell_length_b [5.5985]
_cell_length_c [12.9099]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [Er2MgTaO6]
_chemical_formula_sum '[Er6 Mg3 Ta3 O18]'
_cell_volume [350.4236]
_cell_formula_units_Z [3]
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
[
  Er  Er0  6  0.0000  0.0000  0.2663  1
  Mg  Mg1  3  -0.0000  0.0000  0.5000  1
  Ta  Ta2  3  0.0000  0.0000  0.0000  1
  O  O3  18  0.0155  0.3992  0.2574  1
]