The crystal structure described by K2MgCr2Cd(H2O5)2 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form MgO4 tetrahedra that share  a cornercorner with one Cd(1)O6 octahedra,  a cornercorner with one Cr(1)O4 tetrahedra, and corners with two equivalent Cr(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form CrO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra and  a cornercorner with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-44°. In the second Cr site, Cr(2) is bonded to one O(3), one O(5), one O(7), and one O(9) atom to form CrO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra and corners with two equivalent Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-50°. Cd(1) is bonded to one O(1), one O(10), one O(6), one O(7), one O(8), and one O(9) atom to form CdO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent Cr(1)O4 tetrahedra, and corners with two equivalent Cr(2)O4 tetrahedra. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(10) atom. In the third H site, H(3) is bonded in a distorted linear geometry to one O(1) and one O(4) atom. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(10) and one O(5) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one Mg(1), one Cd(1), one H(1), and one H(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one Mg(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one K(1), one K(2), one Mg(1), and one Cr(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one Cr(1), and one H(3) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(2), one Mg(1), one Cr(2), and one H(4) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cr(1), and one Cd(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cr(2), and one Cd(1) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one Cr(1), and one Cd(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal pyramidal geometry to one K(1), one K(2), one Cr(2), and one Cd(1) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(2), one Cd(1), one H(2), and one H(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2MgCr2Cd(H2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.084
_cell_length_b   6.203
_cell_length_c   7.929
_cell_angle_alpha   103.766
_cell_angle_beta   96.027
_cell_angle_gamma   108.376
_symmetry_Int_Tables_number   1
_cell_volume   270.533
_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
  K  K0  1  0.346  0.656  0.187  1.0
  K  K1  1  0.712  0.354  0.832  1.0
  Mg  Mg2  1  0.328  0.089  0.487  1.0
  Cr  Cr3  1  0.672  0.314  0.243  1.0
  Cr  Cr4  1  0.360  0.681  0.751  1.0
  Cd  Cd5  1  0.028  0.991  0.998  1.0
  H  H6  1  0.963  0.060  0.312  1.0
  H  H7  1  0.880  0.938  0.630  1.0
  H  H8  1  0.866  0.735  0.332  1.0
  H  H9  1  0.090  0.202  0.694  1.0
  O  O10  1  0.051  0.951  0.289  1.0
  O  O11  1  0.616  0.142  0.386  1.0
  O  O12  1  0.359  0.856  0.612  1.0
  O  O13  1  0.739  0.616  0.372  1.0
  O  O14  1  0.299  0.375  0.640  1.0
  O  O15  1  0.436  0.256  0.084  1.0
  O  O16  1  0.612  0.763  0.902  1.0
  O  O17  1  0.914  0.297  0.155  1.0
  O  O18  1  0.135  0.685  0.870  1.0
  O  O19  1  0.961  0.079  0.731  1.0
[/CIF]
.
The crystal structure described by K2MgCr2Cd(H2O5)2 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(10), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form MgO4 tetrahedra that share  a cornercorner with one Cd(1)O6 octahedra,  a cornercorner with one Cr(1)O4 tetrahedra, and corners with two equivalent Cr(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form CrO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra and  a cornercorner with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-44°. In the second Cr site, Cr(2) is bonded to one O(3), one O(5), one O(7), and one O(9) atom to form CrO4 tetrahedra that share corners with two equivalent Cd(1)O6 octahedra and corners with two equivalent Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-50°. Cd(1) is bonded to one O(1), one O(10), one O(6), one O(7), one O(8), and one O(9) atom to form CdO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent Cr(1)O4 tetrahedra, and corners with two equivalent Cr(2)O4 tetrahedra. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(10) atom. In the third H site, H(3) is bonded in a distorted linear geometry to one O(1) and one O(4) atom. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(10) and one O(5) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one Mg(1), one Cd(1), one H(1), and one H(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one Mg(1), and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one K(1), one K(2), one Mg(1), and one Cr(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one Cr(1), and one H(3) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(2), one Mg(1), one Cr(2), and one H(4) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cr(1), and one Cd(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Cr(2), and one Cd(1) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one Cr(1), and one Cd(1) atom. In the ninth O site, O(9) is bonded in a distorted trigonal pyramidal geometry to one K(1), one K(2), one Cr(2), and one Cd(1) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(2), one Cd(1), one H(2), and one H(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2MgCr2Cd(H2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.084
_cell_length_b   6.203
_cell_length_c   7.929
_cell_angle_alpha   103.766
_cell_angle_beta   96.027
_cell_angle_gamma   108.376
_symmetry_Int_Tables_number   1
_cell_volume   270.533
_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
  K  K0  1  0.346  0.656  0.187  1.0
  K  K1  1  0.712  0.354  0.832  1.0
  Mg  Mg2  1  0.328  0.089  0.487  1.0
  Cr  Cr3  1  0.672  0.314  0.243  1.0
  Cr  Cr4  1  0.360  0.681  0.751  1.0
  Cd  Cd5  1  0.028  0.991  0.998  1.0
  H  H6  1  0.963  0.060  0.312  1.0
  H  H7  1  0.880  0.938  0.630  1.0
  H  H8  1  0.866  0.735  0.332  1.0
  H  H9  1  0.090  0.202  0.694  1.0
  O  O10  1  0.051  0.951  0.289  1.0
  O  O11  1  0.616  0.142  0.386  1.0
  O  O12  1  0.359  0.856  0.612  1.0
  O  O13  1  0.739  0.616  0.372  1.0
  O  O14  1  0.299  0.375  0.640  1.0
  O  O15  1  0.436  0.256  0.084  1.0
  O  O16  1  0.612  0.763  0.902  1.0
  O  O17  1  0.914  0.297  0.155  1.0
  O  O18  1  0.135  0.685  0.870  1.0
  O  O19  1  0.961  0.079  0.731  1.0
[/CIF]
.