The material structure described by K4CrO4 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the third K site, K(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(3) and two equivalent O(4) atoms. In the fourth K site, K(4) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted KO5 trigonal bipyramids that share corners with three equivalent Cr(1)O4 tetrahedra,  an edgeedge with one Cr(1)O4 tetrahedra, and edges with two equivalent K(4)O5 trigonal bipyramids. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share corners with three equivalent K(4)O5 trigonal bipyramids and  an edgeedge with one K(4)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to one K(2), two equivalent K(1), two equivalent K(4), and one Cr(1) atom to form distorted edge-sharing OK5Cr octahedra. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent K(4), and one Cr(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(4), two equivalent K(3), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(1), two equivalent K(2), two equivalent K(3), and one Cr(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4CrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.308
_cell_length_b   9.339
_cell_length_c   6.406
_cell_angle_alpha   72.375
_cell_angle_beta   66.929
_cell_angle_gamma   79.926
_symmetry_Int_Tables_number   1
_cell_volume   330.226
_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
  K  K0  1  0.218  0.623  0.965  1.0
  K  K1  1  0.782  0.377  0.035  1.0
  K  K2  1  0.248  0.845  0.422  1.0
  K  K3  1  0.752  0.155  0.578  1.0
  K  K4  1  0.751  0.965  0.228  1.0
  K  K5  1  0.249  0.035  0.772  1.0
  K  K6  1  0.721  0.559  0.494  1.0
  K  K7  1  0.279  0.441  0.506  1.0
  Cr  Cr8  1  0.267  0.248  0.158  1.0
  Cr  Cr9  1  0.733  0.752  0.842  1.0
  O  O10  1  0.956  0.624  0.707  1.0
  O  O11  1  0.044  0.376  0.293  1.0
  O  O12  1  0.438  0.341  0.864  1.0
  O  O13  1  0.562  0.659  0.136  1.0
  O  O14  1  0.555  0.812  0.667  1.0
  O  O15  1  0.445  0.188  0.333  1.0
  O  O16  1  0.887  0.899  0.829  1.0
  O  O17  1  0.113  0.101  0.171  1.0
[/CIF]
.
The material structure described by K4CrO4 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the third K site, K(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(3) and two equivalent O(4) atoms. In the fourth K site, K(4) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted KO5 trigonal bipyramids that share corners with three equivalent Cr(1)O4 tetrahedra,  an edgeedge with one Cr(1)O4 tetrahedra, and edges with two equivalent K(4)O5 trigonal bipyramids. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share corners with three equivalent K(4)O5 trigonal bipyramids and  an edgeedge with one K(4)O5 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to one K(2), two equivalent K(1), two equivalent K(4), and one Cr(1) atom to form distorted edge-sharing OK5Cr octahedra. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent K(4), and one Cr(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(4), two equivalent K(3), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(1), two equivalent K(2), two equivalent K(3), and one Cr(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4CrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.308
_cell_length_b   9.339
_cell_length_c   6.406
_cell_angle_alpha   72.375
_cell_angle_beta   66.929
_cell_angle_gamma   79.926
_symmetry_Int_Tables_number   1
_cell_volume   330.226
_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
  K  K0  1  0.218  0.623  0.965  1.0
  K  K1  1  0.782  0.377  0.035  1.0
  K  K2  1  0.248  0.845  0.422  1.0
  K  K3  1  0.752  0.155  0.578  1.0
  K  K4  1  0.751  0.965  0.228  1.0
  K  K5  1  0.249  0.035  0.772  1.0
  K  K6  1  0.721  0.559  0.494  1.0
  K  K7  1  0.279  0.441  0.506  1.0
  Cr  Cr8  1  0.267  0.248  0.158  1.0
  Cr  Cr9  1  0.733  0.752  0.842  1.0
  O  O10  1  0.956  0.624  0.707  1.0
  O  O11  1  0.044  0.376  0.293  1.0
  O  O12  1  0.438  0.341  0.864  1.0
  O  O13  1  0.562  0.659  0.136  1.0
  O  O14  1  0.555  0.812  0.667  1.0
  O  O15  1  0.445  0.188  0.333  1.0
  O  O16  1  0.887  0.899  0.829  1.0
  O  O17  1  0.113  0.101  0.171  1.0
[/CIF]
.