The structure described by MgCd2(CoO2)4 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form MgO6 octahedra that share edges with four equivalent Co(3)O6 octahedra. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 6-coordinate geometry to one O(3), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Co site, Co(2) is bonded in a distorted T-shaped geometry to one O(4) and two equivalent O(2) atoms. In the third Co site, Co(3) 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 CoO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra and edges with two equivalent Co(3)O6 octahedra. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 6-coordinate geometry to one O(3), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Cd site, Cd(2) is bonded in a 4-coordinate geometry to one O(5), one O(6), and two equivalent O(1) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Co(1), one Co(3), one Cd(1), and one Cd(2) atom to form distorted OMgCd2Co2 trigonal bipyramids that share  a cornercorner with one O(6)MgCdCo2 tetrahedra, corners with five equivalent O(2)MgCdCo3 trigonal bipyramids,  a cornercorner with one O(3)CdCo3 trigonal pyramid,  an edgeedge with one O(6)MgCdCo2 tetrahedra,  an edgeedge with one O(2)MgCdCo3 trigonal bipyramid, edges with two equivalent O(5)Cd2Co3 trigonal bipyramids, edges with two equivalent O(1)MgCd2Co2 trigonal bipyramids, and  an edgeedge with one O(3)CdCo3 trigonal pyramid. In the second O site, O(2) is bonded to one Mg(1), one Co(1), one Co(2), one Co(3), and one Cd(1) atom to form distorted OMgCdCo3 trigonal bipyramids that share corners with two equivalent O(6)MgCdCo2 tetrahedra,  a cornercorner with one O(5)Cd2Co3 trigonal bipyramid, corners with five equivalent O(1)MgCd2Co2 trigonal bipyramids,  a cornercorner with one O(3)CdCo3 trigonal pyramid,  an edgeedge with one O(5)Cd2Co3 trigonal bipyramid,  an edgeedge with one O(1)MgCd2Co2 trigonal bipyramid, edges with two equivalent O(2)MgCdCo3 trigonal bipyramids, and  an edgeedge with one O(3)CdCo3 trigonal pyramid. In the third O site, O(3) is bonded to one Co(1), two equivalent Co(3), and one Cd(1) atom to form distorted OCdCo3 trigonal pyramids that share corners with two equivalent O(6)MgCdCo2 tetrahedra, corners with two equivalent O(1)MgCd2Co2 trigonal bipyramids, corners with two equivalent O(2)MgCdCo3 trigonal bipyramids, corners with four equivalent O(5)Cd2Co3 trigonal bipyramids, edges with two equivalent O(1)MgCd2Co2 trigonal bipyramids, and edges with two equivalent O(2)MgCdCo3 trigonal bipyramids. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Co(2), and two equivalent Co(3) atoms. In the fifth O site, O(5) is bonded to one Co(1), two equivalent Co(3), one Cd(1), and one Cd(2) atom to form distorted OCd2Co3 trigonal bipyramids that share  a cornercorner with one O(6)MgCdCo2 tetrahedra, corners with two equivalent O(2)MgCdCo3 trigonal bipyramids, corners with four equivalent O(3)CdCo3 trigonal pyramids,  an edgeedge with one O(6)MgCdCo2 tetrahedra, edges with two equivalent O(2)MgCdCo3 trigonal bipyramids, and edges with four equivalent O(1)MgCd2Co2 trigonal bipyramids. In the sixth O site, O(6) is bonded to one Mg(1), two equivalent Co(3), and one Cd(2) atom to form OMgCdCo2 tetrahedra that share  a cornercorner with one O(5)Cd2Co3 trigonal bipyramid, corners with two equivalent O(1)MgCd2Co2 trigonal bipyramids, corners with four equivalent O(2)MgCdCo3 trigonal bipyramids, corners with two equivalent O(3)CdCo3 trigonal pyramids,  an edgeedge with one O(5)Cd2Co3 trigonal bipyramid, and edges with two equivalent O(1)MgCd2Co2 trigonal bipyramids. is represented by the CIF file [CIF]
data_MgCd2(CoO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.518
_cell_length_b   6.061
_cell_length_c   5.866
_cell_angle_alpha   61.057
_cell_angle_beta   90.000
_cell_angle_gamma   119.481
_symmetry_Int_Tables_number   1
_cell_volume   167.704
_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
  Mg  Mg0  1  0.371  0.185  0.907  1.0
  Cd  Cd1  1  0.883  0.159  0.920  1.0
  Cd  Cd2  1  0.919  0.823  0.589  1.0
  Co  Co3  1  0.403  0.228  0.386  1.0
  Co  Co4  1  0.848  0.325  0.337  1.0
  Co  Co5  1  0.369  0.692  0.401  1.0
  Co  Co6  1  0.369  0.692  0.907  1.0
  O  O7  1  0.184  0.245  0.142  1.0
  O  O8  1  0.581  0.150  0.189  1.0
  O  O9  1  0.564  0.696  0.152  1.0
  O  O10  1  0.175  0.712  0.144  1.0
  O  O11  1  0.581  0.150  0.661  1.0
  O  O12  1  0.184  0.245  0.613  1.0
  O  O13  1  0.164  0.669  0.666  1.0
  O  O14  1  0.543  0.656  0.672  1.0
[/CIF]
.
The structure described by MgCd2(CoO2)4 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form MgO6 octahedra that share edges with four equivalent Co(3)O6 octahedra. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 6-coordinate geometry to one O(3), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Co site, Co(2) is bonded in a distorted T-shaped geometry to one O(4) and two equivalent O(2) atoms. In the third Co site, Co(3) 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 CoO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra and edges with two equivalent Co(3)O6 octahedra. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 6-coordinate geometry to one O(3), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Cd site, Cd(2) is bonded in a 4-coordinate geometry to one O(5), one O(6), and two equivalent O(1) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Co(1), one Co(3), one Cd(1), and one Cd(2) atom to form distorted OMgCd2Co2 trigonal bipyramids that share  a cornercorner with one O(6)MgCdCo2 tetrahedra, corners with five equivalent O(2)MgCdCo3 trigonal bipyramids,  a cornercorner with one O(3)CdCo3 trigonal pyramid,  an edgeedge with one O(6)MgCdCo2 tetrahedra,  an edgeedge with one O(2)MgCdCo3 trigonal bipyramid, edges with two equivalent O(5)Cd2Co3 trigonal bipyramids, edges with two equivalent O(1)MgCd2Co2 trigonal bipyramids, and  an edgeedge with one O(3)CdCo3 trigonal pyramid. In the second O site, O(2) is bonded to one Mg(1), one Co(1), one Co(2), one Co(3), and one Cd(1) atom to form distorted OMgCdCo3 trigonal bipyramids that share corners with two equivalent O(6)MgCdCo2 tetrahedra,  a cornercorner with one O(5)Cd2Co3 trigonal bipyramid, corners with five equivalent O(1)MgCd2Co2 trigonal bipyramids,  a cornercorner with one O(3)CdCo3 trigonal pyramid,  an edgeedge with one O(5)Cd2Co3 trigonal bipyramid,  an edgeedge with one O(1)MgCd2Co2 trigonal bipyramid, edges with two equivalent O(2)MgCdCo3 trigonal bipyramids, and  an edgeedge with one O(3)CdCo3 trigonal pyramid. In the third O site, O(3) is bonded to one Co(1), two equivalent Co(3), and one Cd(1) atom to form distorted OCdCo3 trigonal pyramids that share corners with two equivalent O(6)MgCdCo2 tetrahedra, corners with two equivalent O(1)MgCd2Co2 trigonal bipyramids, corners with two equivalent O(2)MgCdCo3 trigonal bipyramids, corners with four equivalent O(5)Cd2Co3 trigonal bipyramids, edges with two equivalent O(1)MgCd2Co2 trigonal bipyramids, and edges with two equivalent O(2)MgCdCo3 trigonal bipyramids. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Co(2), and two equivalent Co(3) atoms. In the fifth O site, O(5) is bonded to one Co(1), two equivalent Co(3), one Cd(1), and one Cd(2) atom to form distorted OCd2Co3 trigonal bipyramids that share  a cornercorner with one O(6)MgCdCo2 tetrahedra, corners with two equivalent O(2)MgCdCo3 trigonal bipyramids, corners with four equivalent O(3)CdCo3 trigonal pyramids,  an edgeedge with one O(6)MgCdCo2 tetrahedra, edges with two equivalent O(2)MgCdCo3 trigonal bipyramids, and edges with four equivalent O(1)MgCd2Co2 trigonal bipyramids. In the sixth O site, O(6) is bonded to one Mg(1), two equivalent Co(3), and one Cd(2) atom to form OMgCdCo2 tetrahedra that share  a cornercorner with one O(5)Cd2Co3 trigonal bipyramid, corners with two equivalent O(1)MgCd2Co2 trigonal bipyramids, corners with four equivalent O(2)MgCdCo3 trigonal bipyramids, corners with two equivalent O(3)CdCo3 trigonal pyramids,  an edgeedge with one O(5)Cd2Co3 trigonal bipyramid, and edges with two equivalent O(1)MgCd2Co2 trigonal bipyramids. is represented by the CIF file [CIF]
data_MgCd2(CoO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.518
_cell_length_b   6.061
_cell_length_c   5.866
_cell_angle_alpha   61.057
_cell_angle_beta   90.000
_cell_angle_gamma   119.481
_symmetry_Int_Tables_number   1
_cell_volume   167.704
_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
  Mg  Mg0  1  0.371  0.185  0.907  1.0
  Cd  Cd1  1  0.883  0.159  0.920  1.0
  Cd  Cd2  1  0.919  0.823  0.589  1.0
  Co  Co3  1  0.403  0.228  0.386  1.0
  Co  Co4  1  0.848  0.325  0.337  1.0
  Co  Co5  1  0.369  0.692  0.401  1.0
  Co  Co6  1  0.369  0.692  0.907  1.0
  O  O7  1  0.184  0.245  0.142  1.0
  O  O8  1  0.581  0.150  0.189  1.0
  O  O9  1  0.564  0.696  0.152  1.0
  O  O10  1  0.175  0.712  0.144  1.0
  O  O11  1  0.581  0.150  0.661  1.0
  O  O12  1  0.184  0.245  0.613  1.0
  O  O13  1  0.164  0.669  0.666  1.0
  O  O14  1  0.543  0.656  0.672  1.0
[/CIF]
.