The structure described by CrO2 is Hydrophilite-like structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(4), two equivalent O(2), and three equivalent O(3) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. In the second Cr site, Cr(2) is bonded to one O(2), two equivalent O(4), and three equivalent O(1) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Cr(2) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cr(2) and two equivalent Cr(1) atoms. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to three equivalent Cr(1) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Cr(1) and two equivalent Cr(2) atoms. is represented by the CIF file [CIF]
data_CrO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.999
_cell_length_b   8.680
_cell_length_c   10.404
_cell_angle_alpha   90.015
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   270.813
_cell_formula_units_Z   8
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
  Cr  Cr0  1  0.250  0.416  0.105  1.0
  Cr  Cr1  1  0.750  0.084  0.605  1.0
  Cr  Cr2  1  0.250  0.916  0.395  1.0
  Cr  Cr3  1  0.750  0.584  0.895  1.0
  Cr  Cr4  1  0.750  0.557  0.385  1.0
  Cr  Cr5  1  0.250  0.443  0.615  1.0
  Cr  Cr6  1  0.750  0.057  0.115  1.0
  Cr  Cr7  1  0.250  0.943  0.885  1.0
  O  O8  1  0.250  0.922  0.068  1.0
  O  O9  1  0.750  0.078  0.932  1.0
  O  O10  1  0.250  0.422  0.431  1.0
  O  O11  1  0.750  0.578  0.568  1.0
  O  O12  1  0.250  0.028  0.718  1.0
  O  O13  1  0.750  0.972  0.282  1.0
  O  O14  1  0.250  0.528  0.782  1.0
  O  O15  1  0.750  0.472  0.218  1.0
  O  O16  1  0.250  0.611  0.016  1.0
  O  O17  1  0.750  0.389  0.984  1.0
  O  O18  1  0.250  0.111  0.484  1.0
  O  O19  1  0.750  0.889  0.516  1.0
  O  O20  1  0.750  0.799  0.859  1.0
  O  O21  1  0.250  0.201  0.141  1.0
  O  O22  1  0.250  0.701  0.359  1.0
  O  O23  1  0.750  0.299  0.641  1.0
[/CIF]
.
The structure described by CrO2 is Hydrophilite-like structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(4), two equivalent O(2), and three equivalent O(3) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. In the second Cr site, Cr(2) is bonded to one O(2), two equivalent O(4), and three equivalent O(1) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 50-54°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Cr(2) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cr(2) and two equivalent Cr(1) atoms. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to three equivalent Cr(1) atoms. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Cr(1) and two equivalent Cr(2) atoms. is represented by the CIF file [CIF]
data_CrO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.999
_cell_length_b   8.680
_cell_length_c   10.404
_cell_angle_alpha   90.015
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   270.813
_cell_formula_units_Z   8
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
  Cr  Cr0  1  0.250  0.416  0.105  1.0
  Cr  Cr1  1  0.750  0.084  0.605  1.0
  Cr  Cr2  1  0.250  0.916  0.395  1.0
  Cr  Cr3  1  0.750  0.584  0.895  1.0
  Cr  Cr4  1  0.750  0.557  0.385  1.0
  Cr  Cr5  1  0.250  0.443  0.615  1.0
  Cr  Cr6  1  0.750  0.057  0.115  1.0
  Cr  Cr7  1  0.250  0.943  0.885  1.0
  O  O8  1  0.250  0.922  0.068  1.0
  O  O9  1  0.750  0.078  0.932  1.0
  O  O10  1  0.250  0.422  0.431  1.0
  O  O11  1  0.750  0.578  0.568  1.0
  O  O12  1  0.250  0.028  0.718  1.0
  O  O13  1  0.750  0.972  0.282  1.0
  O  O14  1  0.250  0.528  0.782  1.0
  O  O15  1  0.750  0.472  0.218  1.0
  O  O16  1  0.250  0.611  0.016  1.0
  O  O17  1  0.750  0.389  0.984  1.0
  O  O18  1  0.250  0.111  0.484  1.0
  O  O19  1  0.750  0.889  0.516  1.0
  O  O20  1  0.750  0.799  0.859  1.0
  O  O21  1  0.250  0.201  0.141  1.0
  O  O22  1  0.250  0.701  0.359  1.0
  O  O23  1  0.750  0.299  0.641  1.0
[/CIF]
.