The structure described by LiCr4(HgO4)2 crystallizes in the monoclinic Cm space group. Li(1) is bonded in a 5-coordinate geometry to one Hg(1), one Hg(2), one O(4), two equivalent O(2), and two equivalent O(5) atoms. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(5) atoms to form edge-sharing CrO6 octahedra. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form edge-sharing CrO6 octahedra. In the third Cr site, Cr(3) is bonded to one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted edge-sharing CrO6 octahedra. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 5-coordinate geometry to one Li(1), one O(1), one O(4), and two equivalent O(5) atoms. In the second Hg site, Hg(2) is bonded in a 5-coordinate geometry to one Li(1), one O(3), one O(6), and two equivalent O(2) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Cr(1), two equivalent Cr(2), and one Hg(1) atom to form OCr3Hg tetrahedra that share corners with two equivalent O(3)Cr3Hg tetrahedra, corners with three equivalent O(6)Cr3Hg tetrahedra, corners with two equivalent O(5)LiCr3Hg trigonal bipyramids, corners with four equivalent O(2)LiCr3Hg trigonal bipyramids, and edges with two equivalent O(5)LiCr3Hg trigonal bipyramids. In the second O site, O(2) is bonded to one Li(1), one Cr(1), one Cr(2), one Cr(3), and one Hg(2) atom to form distorted OLiCr3Hg trigonal bipyramids that share  a cornercorner with one O(3)Cr3Hg tetrahedra,  a cornercorner with one O(6)Cr3Hg tetrahedra, corners with two equivalent O(1)Cr3Hg tetrahedra, corners with five equivalent O(5)LiCr3Hg trigonal bipyramids,  an edgeedge with one O(3)Cr3Hg tetrahedra,  an edgeedge with one O(6)Cr3Hg tetrahedra,  an edgeedge with one O(5)LiCr3Hg trigonal bipyramid, and edges with two equivalent O(2)LiCr3Hg trigonal bipyramids. In the third O site, O(3) is bonded to one Cr(3), two equivalent Cr(2), and one Hg(2) atom to form distorted OCr3Hg tetrahedra that share  a cornercorner with one O(6)Cr3Hg tetrahedra, corners with two equivalent O(1)Cr3Hg tetrahedra, corners with two equivalent O(2)LiCr3Hg trigonal bipyramids, corners with four equivalent O(5)LiCr3Hg trigonal bipyramids,  an edgeedge with one O(6)Cr3Hg tetrahedra, and edges with two equivalent O(2)LiCr3Hg trigonal bipyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Li(1), one Cr(3), two equivalent Cr(2), and one Hg(1) atom. In the fifth O site, O(5) is bonded to one Li(1), one Cr(1), one Cr(2), one Cr(3), and one Hg(1) atom to form distorted OLiCr3Hg trigonal bipyramids that share  a cornercorner with one O(1)Cr3Hg tetrahedra, corners with two equivalent O(3)Cr3Hg tetrahedra, corners with two equivalent O(6)Cr3Hg tetrahedra, corners with five equivalent O(2)LiCr3Hg trigonal bipyramids,  an edgeedge with one O(1)Cr3Hg tetrahedra,  an edgeedge with one O(2)LiCr3Hg trigonal bipyramid, and edges with two equivalent O(5)LiCr3Hg trigonal bipyramids. In the sixth O site, O(6) is bonded to one Cr(1), two equivalent Cr(2), and one Hg(2) atom to form OCr3Hg tetrahedra that share  a cornercorner with one O(3)Cr3Hg tetrahedra, corners with three equivalent O(1)Cr3Hg tetrahedra, corners with two equivalent O(2)LiCr3Hg trigonal bipyramids, corners with four equivalent O(5)LiCr3Hg trigonal bipyramids,  an edgeedge with one O(3)Cr3Hg tetrahedra, and edges with two equivalent O(2)LiCr3Hg trigonal bipyramids. is represented by the CIF file [CIF]
data_LiCr4(HgO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.517
_cell_length_b   6.690
_cell_length_c   6.517
_cell_angle_alpha   55.331
_cell_angle_beta   55.542
_cell_angle_gamma   55.328
_symmetry_Int_Tables_number   1
_cell_volume   179.443
_cell_formula_units_Z   1
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
  Li  Li0  1  0.538  0.422  0.538  1.0
  Cr  Cr1  1  0.009  0.471  0.009  1.0
  Cr  Cr2  1  0.509  0.974  0.009  1.0
  Cr  Cr3  1  0.009  0.974  0.509  1.0
  Cr  Cr4  1  0.002  0.986  0.002  1.0
  Hg  Hg5  1  0.641  0.658  0.641  1.0
  Hg  Hg6  1  0.340  0.367  0.340  1.0
  O  O7  1  0.783  0.754  0.783  1.0
  O  O8  1  0.262  0.235  0.793  1.0
  O  O9  1  0.236  0.792  0.236  1.0
  O  O10  1  0.793  0.235  0.261  1.0
  O  O11  1  0.769  0.170  0.769  1.0
  O  O12  1  0.218  0.715  0.758  1.0
  O  O13  1  0.237  0.191  0.237  1.0
  O  O14  1  0.758  0.715  0.219  1.0
[/CIF]
.
The structure described by LiCr4(HgO4)2 crystallizes in the monoclinic Cm space group. Li(1) is bonded in a 5-coordinate geometry to one Hg(1), one Hg(2), one O(4), two equivalent O(2), and two equivalent O(5) atoms. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(6), two equivalent O(2), and two equivalent O(5) atoms to form edge-sharing CrO6 octahedra. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form edge-sharing CrO6 octahedra. In the third Cr site, Cr(3) is bonded to one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted edge-sharing CrO6 octahedra. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 5-coordinate geometry to one Li(1), one O(1), one O(4), and two equivalent O(5) atoms. In the second Hg site, Hg(2) is bonded in a 5-coordinate geometry to one Li(1), one O(3), one O(6), and two equivalent O(2) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Cr(1), two equivalent Cr(2), and one Hg(1) atom to form OCr3Hg tetrahedra that share corners with two equivalent O(3)Cr3Hg tetrahedra, corners with three equivalent O(6)Cr3Hg tetrahedra, corners with two equivalent O(5)LiCr3Hg trigonal bipyramids, corners with four equivalent O(2)LiCr3Hg trigonal bipyramids, and edges with two equivalent O(5)LiCr3Hg trigonal bipyramids. In the second O site, O(2) is bonded to one Li(1), one Cr(1), one Cr(2), one Cr(3), and one Hg(2) atom to form distorted OLiCr3Hg trigonal bipyramids that share  a cornercorner with one O(3)Cr3Hg tetrahedra,  a cornercorner with one O(6)Cr3Hg tetrahedra, corners with two equivalent O(1)Cr3Hg tetrahedra, corners with five equivalent O(5)LiCr3Hg trigonal bipyramids,  an edgeedge with one O(3)Cr3Hg tetrahedra,  an edgeedge with one O(6)Cr3Hg tetrahedra,  an edgeedge with one O(5)LiCr3Hg trigonal bipyramid, and edges with two equivalent O(2)LiCr3Hg trigonal bipyramids. In the third O site, O(3) is bonded to one Cr(3), two equivalent Cr(2), and one Hg(2) atom to form distorted OCr3Hg tetrahedra that share  a cornercorner with one O(6)Cr3Hg tetrahedra, corners with two equivalent O(1)Cr3Hg tetrahedra, corners with two equivalent O(2)LiCr3Hg trigonal bipyramids, corners with four equivalent O(5)LiCr3Hg trigonal bipyramids,  an edgeedge with one O(6)Cr3Hg tetrahedra, and edges with two equivalent O(2)LiCr3Hg trigonal bipyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Li(1), one Cr(3), two equivalent Cr(2), and one Hg(1) atom. In the fifth O site, O(5) is bonded to one Li(1), one Cr(1), one Cr(2), one Cr(3), and one Hg(1) atom to form distorted OLiCr3Hg trigonal bipyramids that share  a cornercorner with one O(1)Cr3Hg tetrahedra, corners with two equivalent O(3)Cr3Hg tetrahedra, corners with two equivalent O(6)Cr3Hg tetrahedra, corners with five equivalent O(2)LiCr3Hg trigonal bipyramids,  an edgeedge with one O(1)Cr3Hg tetrahedra,  an edgeedge with one O(2)LiCr3Hg trigonal bipyramid, and edges with two equivalent O(5)LiCr3Hg trigonal bipyramids. In the sixth O site, O(6) is bonded to one Cr(1), two equivalent Cr(2), and one Hg(2) atom to form OCr3Hg tetrahedra that share  a cornercorner with one O(3)Cr3Hg tetrahedra, corners with three equivalent O(1)Cr3Hg tetrahedra, corners with two equivalent O(2)LiCr3Hg trigonal bipyramids, corners with four equivalent O(5)LiCr3Hg trigonal bipyramids,  an edgeedge with one O(3)Cr3Hg tetrahedra, and edges with two equivalent O(2)LiCr3Hg trigonal bipyramids. is represented by the CIF file [CIF]
data_LiCr4(HgO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.517
_cell_length_b   6.690
_cell_length_c   6.517
_cell_angle_alpha   55.331
_cell_angle_beta   55.542
_cell_angle_gamma   55.328
_symmetry_Int_Tables_number   1
_cell_volume   179.443
_cell_formula_units_Z   1
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
  Li  Li0  1  0.538  0.422  0.538  1.0
  Cr  Cr1  1  0.009  0.471  0.009  1.0
  Cr  Cr2  1  0.509  0.974  0.009  1.0
  Cr  Cr3  1  0.009  0.974  0.509  1.0
  Cr  Cr4  1  0.002  0.986  0.002  1.0
  Hg  Hg5  1  0.641  0.658  0.641  1.0
  Hg  Hg6  1  0.340  0.367  0.340  1.0
  O  O7  1  0.783  0.754  0.783  1.0
  O  O8  1  0.262  0.235  0.793  1.0
  O  O9  1  0.236  0.792  0.236  1.0
  O  O10  1  0.793  0.235  0.261  1.0
  O  O11  1  0.769  0.170  0.769  1.0
  O  O12  1  0.218  0.715  0.758  1.0
  O  O13  1  0.237  0.191  0.237  1.0
  O  O14  1  0.758  0.715  0.219  1.0
[/CIF]
.