The crystal structure described by ZnCrO2 crystallizes in the triclinic P1 space group. There are four inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(7), two equivalent O(4), and two equivalent O(5) atoms to form CrO5 square pyramids that share corners with two equivalent Cr(2)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, edges with two equivalent Cr(4)O6 octahedra, and edges with two equivalent Cr(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 48-51°. In the second Cr site, Cr(2) is bonded to one O(4), one O(8), two equivalent O(3), and two equivalent O(6) atoms to form CrO6 octahedra that share corners with two equivalent Cr(4)O6 octahedra, corners with two equivalent Cr(1)O5 square pyramids, corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, and edges with two equivalent Cr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-52°. In the third Cr site, Cr(3) is bonded in a T-shaped geometry to one O(1), one O(6), and one O(8) atom. In the fourth Cr site, Cr(4) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(7) atoms to form CrO6 octahedra that share corners with two equivalent Cr(2)O6 octahedra,  a cornercorner with one Zn(2)O4 tetrahedra, corners with two equivalent Zn(1)O4 tetrahedra, edges with two equivalent Cr(4)O6 octahedra, and edges with two equivalent Cr(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 49-52°. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(6), one O(7), and two equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with two equivalent Cr(2)O6 octahedra, corners with two equivalent Cr(4)O6 octahedra,  a cornercorner with one Cr(1)O5 square pyramid, corners with two equivalent Zn(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-68°. In the second Zn site, Zn(2) is bonded to one O(2), one O(5), and two equivalent O(8) atoms to form distorted ZnO4 tetrahedra that share  a cornercorner with one Cr(4)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra, corners with two equivalent Cr(1)O5 square pyramids, corners with two equivalent Zn(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-64°. In the third Zn site, Zn(3) is bonded in a distorted L-shaped geometry to one O(2) and one O(5) atom. In the fourth Zn site, Zn(4) is bonded in a distorted L-shaped geometry to one O(1) and one O(3) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Cr(3), two equivalent Cr(4), and one Zn(4) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Zn(2), one Zn(3), and two equivalent Zn(1) atoms. In the third O site, O(3) is bonded to one Cr(4), two equivalent Cr(2), and one Zn(4) atom to form distorted OZnCr3 trigonal pyramids that share  a cornercorner with one O(5)Zn2Cr3 square pyramid, corners with two equivalent O(6)ZnCr3 tetrahedra, corners with two equivalent O(8)Zn2Cr2 trigonal pyramids, corners with two equivalent O(3)ZnCr3 trigonal pyramids, corners with two equivalent O(7)ZnCr3 trigonal pyramids, and  an edgeedge with one O(6)ZnCr3 tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cr(2) and two equivalent Cr(1) atoms. In the fifth O site, O(5) is bonded to one Cr(4), two equivalent Cr(1), one Zn(2), and one Zn(3) atom to form distorted OZn2Cr3 square pyramids that share corners with two equivalent O(5)Zn2Cr3 square pyramids,  a cornercorner with one O(3)ZnCr3 trigonal pyramid, corners with two equivalent O(8)Zn2Cr2 trigonal pyramids, and edges with two equivalent O(7)ZnCr3 trigonal pyramids. In the sixth O site, O(6) is bonded to one Cr(3), two equivalent Cr(2), and one Zn(1) atom to form OZnCr3 tetrahedra that share corners with two equivalent O(6)ZnCr3 tetrahedra,  a cornercorner with one O(8)Zn2Cr2 trigonal pyramid,  a cornercorner with one O(7)ZnCr3 trigonal pyramid, corners with two equivalent O(3)ZnCr3 trigonal pyramids,  an edgeedge with one O(8)Zn2Cr2 trigonal pyramid, and  an edgeedge with one O(3)ZnCr3 trigonal pyramid. In the seventh O site, O(7) is bonded to one Cr(1), two equivalent Cr(4), and one Zn(1) atom to form OZnCr3 trigonal pyramids that share  a cornercorner with one O(6)ZnCr3 tetrahedra, corners with two equivalent O(3)ZnCr3 trigonal pyramids, corners with two equivalent O(7)ZnCr3 trigonal pyramids, and edges with two equivalent O(5)Zn2Cr3 square pyramids. In the eighth O site, O(8) is bonded to one Cr(2), one Cr(3), and two equivalent Zn(2) atoms to form distorted OZn2Cr2 trigonal pyramids that share corners with two equivalent O(5)Zn2Cr3 square pyramids,  a cornercorner with one O(6)ZnCr3 tetrahedra, corners with two equivalent O(8)Zn2Cr2 trigonal pyramids, corners with two equivalent O(3)ZnCr3 trigonal pyramids, and  an edgeedge with one O(6)ZnCr3 tetrahedra. is represented by the CIF card [CIF]
data_ZnCrO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.066
_cell_length_b   7.912
_cell_length_c   7.976
_cell_angle_alpha   101.953
_cell_angle_beta   99.617
_cell_angle_gamma   95.107
_symmetry_Int_Tables_number   1
_cell_volume   185.110
_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
  Zn  Zn0  1  0.923  0.839  0.110  1.0
  Zn  Zn1  1  0.301  0.060  0.834  1.0
  Zn  Zn2  1  0.243  0.204  0.193  1.0
  Zn  Zn3  1  0.909  0.398  0.418  1.0
  Cr  Cr4  1  0.838  0.466  0.100  1.0
  Cr  Cr5  1  0.597  0.761  0.474  1.0
  Cr  Cr6  1  0.365  0.122  0.508  1.0
  Cr  Cr7  1  0.197  0.505  0.776  1.0
  O  O8  1  0.607  0.366  0.639  1.0
  O  O9  1  0.436  0.995  0.060  1.0
  O  O10  1  0.114  0.637  0.569  1.0
  O  O11  1  0.439  0.589  0.244  1.0
  O  O12  1  0.247  0.330  0.953  1.0
  O  O13  1  0.085  0.882  0.371  1.0
  O  O14  1  0.787  0.630  0.918  1.0
  O  O15  1  0.720  0.989  0.674  1.0
[/CIF]
.
The crystal structure described by ZnCrO2 crystallizes in the triclinic P1 space group. There are four inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(7), two equivalent O(4), and two equivalent O(5) atoms to form CrO5 square pyramids that share corners with two equivalent Cr(2)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, edges with two equivalent Cr(4)O6 octahedra, and edges with two equivalent Cr(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 48-51°. In the second Cr site, Cr(2) is bonded to one O(4), one O(8), two equivalent O(3), and two equivalent O(6) atoms to form CrO6 octahedra that share corners with two equivalent Cr(4)O6 octahedra, corners with two equivalent Cr(1)O5 square pyramids, corners with two equivalent Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, and edges with two equivalent Cr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-52°. In the third Cr site, Cr(3) is bonded in a T-shaped geometry to one O(1), one O(6), and one O(8) atom. In the fourth Cr site, Cr(4) is bonded to one O(3), one O(5), two equivalent O(1), and two equivalent O(7) atoms to form CrO6 octahedra that share corners with two equivalent Cr(2)O6 octahedra,  a cornercorner with one Zn(2)O4 tetrahedra, corners with two equivalent Zn(1)O4 tetrahedra, edges with two equivalent Cr(4)O6 octahedra, and edges with two equivalent Cr(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 49-52°. There are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(6), one O(7), and two equivalent O(2) atoms to form ZnO4 tetrahedra that share corners with two equivalent Cr(2)O6 octahedra, corners with two equivalent Cr(4)O6 octahedra,  a cornercorner with one Cr(1)O5 square pyramid, corners with two equivalent Zn(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-68°. In the second Zn site, Zn(2) is bonded to one O(2), one O(5), and two equivalent O(8) atoms to form distorted ZnO4 tetrahedra that share  a cornercorner with one Cr(4)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra, corners with two equivalent Cr(1)O5 square pyramids, corners with two equivalent Zn(1)O4 tetrahedra, and corners with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-64°. In the third Zn site, Zn(3) is bonded in a distorted L-shaped geometry to one O(2) and one O(5) atom. In the fourth Zn site, Zn(4) is bonded in a distorted L-shaped geometry to one O(1) and one O(3) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Cr(3), two equivalent Cr(4), and one Zn(4) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Zn(2), one Zn(3), and two equivalent Zn(1) atoms. In the third O site, O(3) is bonded to one Cr(4), two equivalent Cr(2), and one Zn(4) atom to form distorted OZnCr3 trigonal pyramids that share  a cornercorner with one O(5)Zn2Cr3 square pyramid, corners with two equivalent O(6)ZnCr3 tetrahedra, corners with two equivalent O(8)Zn2Cr2 trigonal pyramids, corners with two equivalent O(3)ZnCr3 trigonal pyramids, corners with two equivalent O(7)ZnCr3 trigonal pyramids, and  an edgeedge with one O(6)ZnCr3 tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cr(2) and two equivalent Cr(1) atoms. In the fifth O site, O(5) is bonded to one Cr(4), two equivalent Cr(1), one Zn(2), and one Zn(3) atom to form distorted OZn2Cr3 square pyramids that share corners with two equivalent O(5)Zn2Cr3 square pyramids,  a cornercorner with one O(3)ZnCr3 trigonal pyramid, corners with two equivalent O(8)Zn2Cr2 trigonal pyramids, and edges with two equivalent O(7)ZnCr3 trigonal pyramids. In the sixth O site, O(6) is bonded to one Cr(3), two equivalent Cr(2), and one Zn(1) atom to form OZnCr3 tetrahedra that share corners with two equivalent O(6)ZnCr3 tetrahedra,  a cornercorner with one O(8)Zn2Cr2 trigonal pyramid,  a cornercorner with one O(7)ZnCr3 trigonal pyramid, corners with two equivalent O(3)ZnCr3 trigonal pyramids,  an edgeedge with one O(8)Zn2Cr2 trigonal pyramid, and  an edgeedge with one O(3)ZnCr3 trigonal pyramid. In the seventh O site, O(7) is bonded to one Cr(1), two equivalent Cr(4), and one Zn(1) atom to form OZnCr3 trigonal pyramids that share  a cornercorner with one O(6)ZnCr3 tetrahedra, corners with two equivalent O(3)ZnCr3 trigonal pyramids, corners with two equivalent O(7)ZnCr3 trigonal pyramids, and edges with two equivalent O(5)Zn2Cr3 square pyramids. In the eighth O site, O(8) is bonded to one Cr(2), one Cr(3), and two equivalent Zn(2) atoms to form distorted OZn2Cr2 trigonal pyramids that share corners with two equivalent O(5)Zn2Cr3 square pyramids,  a cornercorner with one O(6)ZnCr3 tetrahedra, corners with two equivalent O(8)Zn2Cr2 trigonal pyramids, corners with two equivalent O(3)ZnCr3 trigonal pyramids, and  an edgeedge with one O(6)ZnCr3 tetrahedra. is represented by the CIF card [CIF]
data_ZnCrO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.066
_cell_length_b   7.912
_cell_length_c   7.976
_cell_angle_alpha   101.953
_cell_angle_beta   99.617
_cell_angle_gamma   95.107
_symmetry_Int_Tables_number   1
_cell_volume   185.110
_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
  Zn  Zn0  1  0.923  0.839  0.110  1.0
  Zn  Zn1  1  0.301  0.060  0.834  1.0
  Zn  Zn2  1  0.243  0.204  0.193  1.0
  Zn  Zn3  1  0.909  0.398  0.418  1.0
  Cr  Cr4  1  0.838  0.466  0.100  1.0
  Cr  Cr5  1  0.597  0.761  0.474  1.0
  Cr  Cr6  1  0.365  0.122  0.508  1.0
  Cr  Cr7  1  0.197  0.505  0.776  1.0
  O  O8  1  0.607  0.366  0.639  1.0
  O  O9  1  0.436  0.995  0.060  1.0
  O  O10  1  0.114  0.637  0.569  1.0
  O  O11  1  0.439  0.589  0.244  1.0
  O  O12  1  0.247  0.330  0.953  1.0
  O  O13  1  0.085  0.882  0.371  1.0
  O  O14  1  0.787  0.630  0.918  1.0
  O  O15  1  0.720  0.989  0.674  1.0
[/CIF]
.