data_ZnO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.56
_cell_length_b   4.56
_cell_length_c   3.01
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ZnO2
_chemical_formula_sum   'Zn2 O4'
_cell_volume   62.79
_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
  Zn  Zn4  1  0.0  0.0  0.0  1.0
  Zn  Zn5  1  0.28  0.28  0.51  1.0
  O  O0  1  0.42  0.42  0.0  1.0
  O  O1  1  0.14  0.14  0.0  1.0
  O  O2  1  0.71  0.86  0.51  1.0
  O  O3  1  0.86  0.71  0.51  1.0

data_ZnO2
_symmetry_space_group_name_H-M   Amm2
_cell_length_a   3.01
_cell_length_b   6.46
_cell_length_c   6.46
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   38
_chemical_formula_structural   ZnO2
_chemical_formula_sum   'Zn4 O8'
_cell_volume   125.58
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, z'
  3  '-x, y, z'
  4  'x, -y, z'
  5  'x, y+1/2, z+1/2'
  6  '-x, -y+1/2, z+1/2'
  7  '-x, y+1/2, z+1/2'
  8  'x, -y+1/2, z+1/2'
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
  Zn  Zn0  2  0.0  0.0  0.0  1.0
  Zn  Zn1  2  0.5  0.0  0.28  1.0
  O  O2  4  0.5  0.08  0.78  1.0
  O  O3  2  0.0  0.0  0.14  1.0
  O  O4  2  0.0  0.0  0.42  1.0

Zn Zn O O O O