data_[Mg2Nb2Cr2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Mg  1.3100  1.5000  0.8600
  Nb  1.6000  1.4500  0.8200
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [3.0067]
_cell_length_b [6.6106]
_cell_length_c [8.8202]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [MgNbCrO4]
_chemical_formula_sum '[Mg2 Nb2 Cr2 O8]'
_cell_volume [175.3119]
_cell_formula_units_Z [2]
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
[
  Mg  Mg0  2  0.0000  0.0000  0.6947  1
  Nb  Nb1  2  0.0000  0.0000  0.0260  1
  Cr  Cr2  2  0.5000  0.0000  0.4305  1
  O  O3  4  0.0000  0.1945  0.5083  1
  O  O4  2  0.5000  0.0000  0.1889  1
  O  O5  2  0.5000  0.0000  0.8377  1
]