The crystal structure described by ZnCr2S4 crystallizes in the orthorhombic Imma space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form CrS6 octahedra that share edges with two equivalent Cr(1)S6 octahedra, edges with four equivalent Cr(2)S6 octahedra, and edges with four equivalent Zn(1)S6 octahedra. In the second Cr site, Cr(2) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form CrS6 octahedra that share corners with six equivalent Zn(1)S6 octahedra, edges with two equivalent Cr(2)S6 octahedra, edges with two equivalent Zn(1)S6 octahedra, and edges with four equivalent Cr(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 4-8°. Zn(1) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form ZnS6 octahedra that share corners with six equivalent Cr(2)S6 octahedra, edges with two equivalent Cr(2)S6 octahedra, edges with two equivalent Zn(1)S6 octahedra, and edges with four equivalent Cr(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 4-8°. There are two inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Cr(2), two equivalent Cr(1), and one Zn(1) atom. In the second S site, S(2) is bonded to one Cr(1), two equivalent Cr(2), and two equivalent Zn(1) atoms to form a mixture of corner and edge-sharing SZn2Cr3 square pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zn(CrS2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.020
_cell_length_b   7.020
_cell_length_c   7.020
_cell_angle_alpha   119.197
_cell_angle_beta   118.093
_cell_angle_gamma   92.365
_symmetry_Int_Tables_number   1
_cell_volume   249.425
_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  Zn0  1  0.500  0.000  0.500  1.0
  Zn  Zn1  1  0.000  0.000  0.000  1.0
  Cr  Cr2  1  0.500  0.500  0.500  1.0
  Cr  Cr3  1  0.500  0.500  0.000  1.0
  Cr  Cr4  1  0.500  0.000  0.000  1.0
  Cr  Cr5  1  0.000  0.500  0.500  1.0
  S  S6  1  0.726  0.250  0.476  1.0
  S  S7  1  0.744  0.728  0.484  1.0
  S  S8  1  0.275  0.250  0.024  1.0
  S  S9  1  0.256  0.740  0.984  1.0
  S  S10  1  0.725  0.750  0.976  1.0
  S  S11  1  0.256  0.272  0.516  1.0
  S  S12  1  0.744  0.260  0.016  1.0
  S  S13  1  0.274  0.750  0.524  1.0
[/CIF]
.
The crystal structure described by ZnCr2S4 crystallizes in the orthorhombic Imma space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent S(2) and four equivalent S(1) atoms to form CrS6 octahedra that share edges with two equivalent Cr(1)S6 octahedra, edges with four equivalent Cr(2)S6 octahedra, and edges with four equivalent Zn(1)S6 octahedra. In the second Cr site, Cr(2) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form CrS6 octahedra that share corners with six equivalent Zn(1)S6 octahedra, edges with two equivalent Cr(2)S6 octahedra, edges with two equivalent Zn(1)S6 octahedra, and edges with four equivalent Cr(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 4-8°. Zn(1) is bonded to two equivalent S(1) and four equivalent S(2) atoms to form ZnS6 octahedra that share corners with six equivalent Cr(2)S6 octahedra, edges with two equivalent Cr(2)S6 octahedra, edges with two equivalent Zn(1)S6 octahedra, and edges with four equivalent Cr(1)S6 octahedra. The corner-sharing octahedral tilt angles range from 4-8°. There are two inequivalent S sites. In the first S site, S(1) is bonded in a rectangular see-saw-like geometry to one Cr(2), two equivalent Cr(1), and one Zn(1) atom. In the second S site, S(2) is bonded to one Cr(1), two equivalent Cr(2), and two equivalent Zn(1) atoms to form a mixture of corner and edge-sharing SZn2Cr3 square pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Zn(CrS2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.020
_cell_length_b   7.020
_cell_length_c   7.020
_cell_angle_alpha   119.197
_cell_angle_beta   118.093
_cell_angle_gamma   92.365
_symmetry_Int_Tables_number   1
_cell_volume   249.425
_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  Zn0  1  0.500  0.000  0.500  1.0
  Zn  Zn1  1  0.000  0.000  0.000  1.0
  Cr  Cr2  1  0.500  0.500  0.500  1.0
  Cr  Cr3  1  0.500  0.500  0.000  1.0
  Cr  Cr4  1  0.500  0.000  0.000  1.0
  Cr  Cr5  1  0.000  0.500  0.500  1.0
  S  S6  1  0.726  0.250  0.476  1.0
  S  S7  1  0.744  0.728  0.484  1.0
  S  S8  1  0.275  0.250  0.024  1.0
  S  S9  1  0.256  0.740  0.984  1.0
  S  S10  1  0.725  0.750  0.976  1.0
  S  S11  1  0.256  0.272  0.516  1.0
  S  S12  1  0.744  0.260  0.016  1.0
  S  S13  1  0.274  0.750  0.524  1.0
[/CIF]
.