The material described by Na4Mg(CoO3)2 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Co(2)O4 tetrahedra, corners with three equivalent Mg(1)O4 tetrahedra, and  an edgeedge with one Co(2)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), one O(5), and one O(6) atom. In the third Na site, Na(3) is bonded in a distorted see-saw-like geometry to one O(1), one O(4), one O(5), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(6) atom. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form distorted MgO4 tetrahedra that share corners with two equivalent Co(2)O4 tetrahedra and corners with three equivalent Na(1)O5 trigonal bipyramids. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(5) atom. In the second Co site, Co(2) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form CoO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  an edgeedge with one Na(1)O5 trigonal bipyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Na(3), one Na(4), one Mg(1), and one Co(2) atom to form distorted ONa2MgCo trigonal pyramids that share  a cornercorner with one O(6)Na4Mg trigonal bipyramid,  an edgeedge with one O(5)Na3Co2 square pyramid, and  an edgeedge with one O(6)Na4Mg trigonal bipyramid. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), one Mg(1), and one Co(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), one Mg(1), and one Co(2) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Co(1), and one Co(2) atom. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), one Na(3), one Co(1), and one Co(2) atom to form distorted ONa3Co2 square pyramids that share  a cornercorner with one O(6)Na4Mg trigonal bipyramid,  an edgeedge with one O(6)Na4Mg trigonal bipyramid, and  an edgeedge with one O(1)Na2MgCo trigonal pyramid. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), and one Mg(1) atom to form ONa4Mg trigonal bipyramids that share  a cornercorner with one O(5)Na3Co2 square pyramid,  a cornercorner with one O(1)Na2MgCo trigonal pyramid,  an edgeedge with one O(5)Na3Co2 square pyramid, and  an edgeedge with one O(1)Na2MgCo trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4Mg(CoO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.009
_cell_length_b   5.860
_cell_length_c   6.595
_cell_angle_alpha   79.353
_cell_angle_beta   96.640
_cell_angle_gamma   59.228
_symmetry_Int_Tables_number   1
_cell_volume   189.932
_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
  Na  Na0  1  0.116  0.248  0.461  1.0
  Na  Na1  1  0.723  0.898  0.416  1.0
  Na  Na2  1  0.595  0.410  0.641  1.0
  Na  Na3  1  0.877  0.173  0.082  1.0
  Mg  Mg4  1  0.387  0.617  0.160  1.0
  Co  Co5  1  0.847  0.713  0.912  1.0
  Co  Co6  1  0.332  0.211  0.942  1.0
  O  O7  1  0.397  0.479  0.908  1.0
  O  O8  1  0.006  0.703  0.163  1.0
  O  O9  1  0.341  0.979  0.171  1.0
  O  O10  1  0.948  0.438  0.782  1.0
  O  O11  1  0.532  0.012  0.744  1.0
  O  O12  1  0.712  0.307  0.355  1.0
[/CIF]
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The material described by Na4Mg(CoO3)2 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Co(2)O4 tetrahedra, corners with three equivalent Mg(1)O4 tetrahedra, and  an edgeedge with one Co(2)O4 tetrahedra. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), one O(5), and one O(6) atom. In the third Na site, Na(3) is bonded in a distorted see-saw-like geometry to one O(1), one O(4), one O(5), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(6) atom. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form distorted MgO4 tetrahedra that share corners with two equivalent Co(2)O4 tetrahedra and corners with three equivalent Na(1)O5 trigonal bipyramids. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(5) atom. In the second Co site, Co(2) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form CoO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid, and  an edgeedge with one Na(1)O5 trigonal bipyramid. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Na(3), one Na(4), one Mg(1), and one Co(2) atom to form distorted ONa2MgCo trigonal pyramids that share  a cornercorner with one O(6)Na4Mg trigonal bipyramid,  an edgeedge with one O(5)Na3Co2 square pyramid, and  an edgeedge with one O(6)Na4Mg trigonal bipyramid. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), one Mg(1), and one Co(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(4), one Mg(1), and one Co(2) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Co(1), and one Co(2) atom. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), one Na(3), one Co(1), and one Co(2) atom to form distorted ONa3Co2 square pyramids that share  a cornercorner with one O(6)Na4Mg trigonal bipyramid,  an edgeedge with one O(6)Na4Mg trigonal bipyramid, and  an edgeedge with one O(1)Na2MgCo trigonal pyramid. In the sixth O site, O(6) is bonded to one Na(1), one Na(2), one Na(3), one Na(4), and one Mg(1) atom to form ONa4Mg trigonal bipyramids that share  a cornercorner with one O(5)Na3Co2 square pyramid,  a cornercorner with one O(1)Na2MgCo trigonal pyramid,  an edgeedge with one O(5)Na3Co2 square pyramid, and  an edgeedge with one O(1)Na2MgCo trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na4Mg(CoO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.009
_cell_length_b   5.860
_cell_length_c   6.595
_cell_angle_alpha   79.353
_cell_angle_beta   96.640
_cell_angle_gamma   59.228
_symmetry_Int_Tables_number   1
_cell_volume   189.932
_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
  Na  Na0  1  0.116  0.248  0.461  1.0
  Na  Na1  1  0.723  0.898  0.416  1.0
  Na  Na2  1  0.595  0.410  0.641  1.0
  Na  Na3  1  0.877  0.173  0.082  1.0
  Mg  Mg4  1  0.387  0.617  0.160  1.0
  Co  Co5  1  0.847  0.713  0.912  1.0
  Co  Co6  1  0.332  0.211  0.942  1.0
  O  O7  1  0.397  0.479  0.908  1.0
  O  O8  1  0.006  0.703  0.163  1.0
  O  O9  1  0.341  0.979  0.171  1.0
  O  O10  1  0.948  0.438  0.782  1.0
  O  O11  1  0.532  0.012  0.744  1.0
  O  O12  1  0.712  0.307  0.355  1.0
[/CIF]
.