The compound described by MgCo5O8 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(2), one O(5), and two equivalent O(3) atoms to form MgO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra, corners with four equivalent Co(4)O5 trigonal bipyramids, and  an edgeedge with one Co(2)O5 trigonal bipyramid. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form distorted CoO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with four equivalent Co(4)O5 trigonal bipyramids, and  an edgeedge with one Co(2)O5 trigonal bipyramid. In the second Co site, Co(2) is bonded to one O(6), two equivalent O(3), and two equivalent O(4) atoms to form distorted CoO5 trigonal bipyramids that share corners with two equivalent Co(4)O5 trigonal bipyramids,  an edgeedge with one Mg(1)O4 tetrahedra,  an edgeedge with one Co(1)O4 tetrahedra, and edges with two equivalent Co(4)O5 trigonal bipyramids. In the third Co site, Co(3) is bonded in a square co-planar geometry to one O(2), one O(6), and two equivalent O(3) atoms. In the fourth Co site, Co(4) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CoO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra,  a cornercorner with one Co(2)O5 trigonal bipyramid,  a cornercorner with one Co(4)O5 trigonal bipyramid,  an edgeedge with one Co(2)O5 trigonal bipyramid, and  an edgeedge with one Co(4)O5 trigonal bipyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Co(1) and two equivalent Co(4) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Co(1), and one Co(3) atom. In the third O site, O(3) is bonded to one Mg(1), one Co(2), one Co(3), and one Co(4) atom to form a mixture of distorted edge and corner-sharing OMgCo3 tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), one Co(2), and one Co(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Co(4) atoms. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(3), and two equivalent Co(4) atoms. is represented by the CIF card [CIF]
data_MgCo5O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.693
_cell_length_b   7.656
_cell_length_c   6.279
_cell_angle_alpha   90.000
_cell_angle_beta   62.026
_cell_angle_gamma   47.616
_symmetry_Int_Tables_number   1
_cell_volume   183.572
_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  0.540  0.601  0.480  1.0
  Co  Co1  1  0.751  0.095  0.374  1.0
  Co  Co2  1  0.295  0.116  0.602  1.0
  Co  Co3  1  0.430  0.851  0.035  1.0
  Co  Co4  1  0.030  0.591  0.497  1.0
  Co  Co5  1  0.030  0.591  0.973  1.0
  O  O6  1  0.038  0.721  0.231  1.0
  O  O7  1  0.951  0.194  0.274  1.0
  O  O8  1  0.512  0.818  0.700  1.0
  O  O9  1  0.512  0.818  0.288  1.0
  O  O10  1  0.446  0.218  0.754  1.0
  O  O11  1  0.446  0.218  0.299  1.0
  O  O12  1  0.140  0.675  0.680  1.0
  O  O13  1  0.866  0.501  0.817  1.0
[/CIF]
.
The compound described by MgCo5O8 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(2), one O(5), and two equivalent O(3) atoms to form MgO4 tetrahedra that share  a cornercorner with one Co(1)O4 tetrahedra, corners with four equivalent Co(4)O5 trigonal bipyramids, and  an edgeedge with one Co(2)O5 trigonal bipyramid. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form distorted CoO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with four equivalent Co(4)O5 trigonal bipyramids, and  an edgeedge with one Co(2)O5 trigonal bipyramid. In the second Co site, Co(2) is bonded to one O(6), two equivalent O(3), and two equivalent O(4) atoms to form distorted CoO5 trigonal bipyramids that share corners with two equivalent Co(4)O5 trigonal bipyramids,  an edgeedge with one Mg(1)O4 tetrahedra,  an edgeedge with one Co(1)O4 tetrahedra, and edges with two equivalent Co(4)O5 trigonal bipyramids. In the third Co site, Co(3) is bonded in a square co-planar geometry to one O(2), one O(6), and two equivalent O(3) atoms. In the fourth Co site, Co(4) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form distorted CoO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra,  a cornercorner with one Co(2)O5 trigonal bipyramid,  a cornercorner with one Co(4)O5 trigonal bipyramid,  an edgeedge with one Co(2)O5 trigonal bipyramid, and  an edgeedge with one Co(4)O5 trigonal bipyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Co(1) and two equivalent Co(4) atoms. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Co(1), and one Co(3) atom. In the third O site, O(3) is bonded to one Mg(1), one Co(2), one Co(3), and one Co(4) atom to form a mixture of distorted edge and corner-sharing OMgCo3 tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Co(1), one Co(2), and one Co(4) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Co(4) atoms. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Co(2), one Co(3), and two equivalent Co(4) atoms. is represented by the CIF card [CIF]
data_MgCo5O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.693
_cell_length_b   7.656
_cell_length_c   6.279
_cell_angle_alpha   90.000
_cell_angle_beta   62.026
_cell_angle_gamma   47.616
_symmetry_Int_Tables_number   1
_cell_volume   183.572
_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  0.540  0.601  0.480  1.0
  Co  Co1  1  0.751  0.095  0.374  1.0
  Co  Co2  1  0.295  0.116  0.602  1.0
  Co  Co3  1  0.430  0.851  0.035  1.0
  Co  Co4  1  0.030  0.591  0.497  1.0
  Co  Co5  1  0.030  0.591  0.973  1.0
  O  O6  1  0.038  0.721  0.231  1.0
  O  O7  1  0.951  0.194  0.274  1.0
  O  O8  1  0.512  0.818  0.700  1.0
  O  O9  1  0.512  0.818  0.288  1.0
  O  O10  1  0.446  0.218  0.754  1.0
  O  O11  1  0.446  0.218  0.299  1.0
  O  O12  1  0.140  0.675  0.680  1.0
  O  O13  1  0.866  0.501  0.817  1.0
[/CIF]
.