The structure described by Na4Mg(CuO2)4 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(7) atom. In the second Na site, Na(2) is bonded to one O(1), one O(3), one O(5), one O(6), and one O(8) atom to form distorted NaO5 trigonal bipyramids that share  an edgeedge with one Na(3)O5 trigonal bipyramid and edges with two equivalent Mg(1)O5 trigonal bipyramids. In the third Na site, Na(3) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form distorted NaO5 trigonal bipyramids that share  an edgeedge with one Na(2)O5 trigonal bipyramid and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the fourth Na site, Na(4) is bonded in a 3-coordinate geometry to one O(4), one O(6), and one O(8) atom. Mg(1) is bonded to one O(1), one O(3), one O(6), one O(7), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  an edgeedge with one Na(3)O5 trigonal bipyramid and edges with two equivalent Na(2)O5 trigonal bipyramids. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(1), one O(3), one O(5), and one O(7) atom. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(3), one O(5), and one O(7) atom. In the third Cu site, Cu(3) is bonded in a distorted square co-planar geometry to one O(2), one O(4), one O(6), and one O(8) atom. In the fourth Cu site, Cu(4) is bonded in a square co-planar geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Mg(1), one Cu(1), and one Cu(2) atom to form ONa2MgCu2 square pyramids that share  a cornercorner with one O(4)Na3Cu2 trigonal bipyramid, corners with two equivalent O(7)Na2MgCu2 trigonal bipyramids, edges with two equivalent O(5)Na3Cu2 square pyramids,  an edgeedge with one O(7)Na2MgCu2 trigonal bipyramid,  an edgeedge with one O(8)Na2MgCu2 trigonal bipyramid, and edges with two equivalent O(3)Na2MgCu2 trigonal bipyramids. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(3), one Cu(3), and one Cu(4) atom. In the third O site, O(3) is bonded to one Na(2), one Na(3), one Mg(1), one Cu(1), and one Cu(2) atom to form distorted ONa2MgCu2 trigonal bipyramids that share corners with two equivalent O(5)Na3Cu2 square pyramids,  a cornercorner with one O(4)Na3Cu2 trigonal bipyramid, corners with two equivalent O(8)Na2MgCu2 trigonal bipyramids,  an edgeedge with one O(5)Na3Cu2 square pyramid, edges with two equivalent O(1)Na2MgCu2 square pyramids, and edges with two equivalent O(7)Na2MgCu2 trigonal bipyramids. In the fourth O site, O(4) is bonded to one Na(1), one Na(3), one Na(4), one Cu(3), and one Cu(4) atom to form ONa3Cu2 trigonal bipyramids that share  a cornercorner with one O(1)Na2MgCu2 square pyramid, corners with two equivalent O(5)Na3Cu2 square pyramids,  a cornercorner with one O(3)Na2MgCu2 trigonal bipyramid,  a cornercorner with one O(8)Na2MgCu2 trigonal bipyramid,  an edgeedge with one O(7)Na2MgCu2 trigonal bipyramid, and  an edgeedge with one O(8)Na2MgCu2 trigonal bipyramid. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), one Na(3), one Cu(1), and one Cu(2) atom to form distorted ONa3Cu2 square pyramids that share  a cornercorner with one O(8)Na2MgCu2 trigonal bipyramid, corners with two equivalent O(3)Na2MgCu2 trigonal bipyramids, corners with two equivalent O(4)Na3Cu2 trigonal bipyramids, edges with two equivalent O(1)Na2MgCu2 square pyramids,  an edgeedge with one O(3)Na2MgCu2 trigonal bipyramid, and edges with two equivalent O(7)Na2MgCu2 trigonal bipyramids. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Mg(1), one Cu(3), and one Cu(4) atom. In the seventh O site, O(7) is bonded to one Na(1), one Na(3), one Mg(1), one Cu(1), and one Cu(2) atom to form distorted ONa2MgCu2 trigonal bipyramids that share corners with two equivalent O(1)Na2MgCu2 square pyramids,  a cornercorner with one O(8)Na2MgCu2 trigonal bipyramid,  an edgeedge with one O(1)Na2MgCu2 square pyramid, edges with two equivalent O(5)Na3Cu2 square pyramids,  an edgeedge with one O(4)Na3Cu2 trigonal bipyramid, and edges with two equivalent O(3)Na2MgCu2 trigonal bipyramids. In the eighth O site, O(8) is bonded to one Na(2), one Na(4), one Mg(1), one Cu(3), and one Cu(4) atom to form distorted ONa2MgCu2 trigonal bipyramids that share  a cornercorner with one O(5)Na3Cu2 square pyramid,  a cornercorner with one O(7)Na2MgCu2 trigonal bipyramid,  a cornercorner with one O(4)Na3Cu2 trigonal bipyramid, corners with two equivalent O(3)Na2MgCu2 trigonal bipyramids,  an edgeedge with one O(1)Na2MgCu2 square pyramid, and  an edgeedge with one O(4)Na3Cu2 trigonal bipyramid. is represented by the CIF card [CIF]
data_Na4Mg(CuO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.541
_cell_length_b   5.657
_cell_length_c   8.882
_cell_angle_alpha   89.823
_cell_angle_beta   69.367
_cell_angle_gamma   75.230
_symmetry_Int_Tables_number   1
_cell_volume   250.785
_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  0.418  0.018  0.445  1.0
  Na  Na1  1  0.621  0.217  0.096  1.0
  Na  Na2  1  0.447  0.507  0.449  1.0
  Na  Na3  1  0.438  0.808  0.827  1.0
  Mg  Mg4  1  0.610  0.716  0.102  1.0
  Cu  Cu5  1  0.044  0.357  0.247  1.0
  Cu  Cu6  1  0.031  0.860  0.253  1.0
  Cu  Cu7  1  0.970  0.132  0.773  1.0
  Cu  Cu8  1  0.994  0.622  0.771  1.0
  O  O9  1  0.294  0.026  0.213  1.0
  O  O10  1  0.186  0.328  0.649  1.0
  O  O11  1  0.294  0.561  0.217  1.0
  O  O12  1  0.210  0.816  0.660  1.0
  O  O13  1  0.788  0.167  0.296  1.0
  O  O14  1  0.753  0.460  0.897  1.0
  O  O15  1  0.784  0.677  0.269  1.0
  O  O16  1  0.773  0.907  0.902  1.0
[/CIF]
.
The structure described by Na4Mg(CuO2)4 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(7) atom. In the second Na site, Na(2) is bonded to one O(1), one O(3), one O(5), one O(6), and one O(8) atom to form distorted NaO5 trigonal bipyramids that share  an edgeedge with one Na(3)O5 trigonal bipyramid and edges with two equivalent Mg(1)O5 trigonal bipyramids. In the third Na site, Na(3) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form distorted NaO5 trigonal bipyramids that share  an edgeedge with one Na(2)O5 trigonal bipyramid and  an edgeedge with one Mg(1)O5 trigonal bipyramid. In the fourth Na site, Na(4) is bonded in a 3-coordinate geometry to one O(4), one O(6), and one O(8) atom. Mg(1) is bonded to one O(1), one O(3), one O(6), one O(7), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  an edgeedge with one Na(3)O5 trigonal bipyramid and edges with two equivalent Na(2)O5 trigonal bipyramids. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(1), one O(3), one O(5), and one O(7) atom. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(3), one O(5), and one O(7) atom. In the third Cu site, Cu(3) is bonded in a distorted square co-planar geometry to one O(2), one O(4), one O(6), and one O(8) atom. In the fourth Cu site, Cu(4) is bonded in a square co-planar geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Mg(1), one Cu(1), and one Cu(2) atom to form ONa2MgCu2 square pyramids that share  a cornercorner with one O(4)Na3Cu2 trigonal bipyramid, corners with two equivalent O(7)Na2MgCu2 trigonal bipyramids, edges with two equivalent O(5)Na3Cu2 square pyramids,  an edgeedge with one O(7)Na2MgCu2 trigonal bipyramid,  an edgeedge with one O(8)Na2MgCu2 trigonal bipyramid, and edges with two equivalent O(3)Na2MgCu2 trigonal bipyramids. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(3), one Cu(3), and one Cu(4) atom. In the third O site, O(3) is bonded to one Na(2), one Na(3), one Mg(1), one Cu(1), and one Cu(2) atom to form distorted ONa2MgCu2 trigonal bipyramids that share corners with two equivalent O(5)Na3Cu2 square pyramids,  a cornercorner with one O(4)Na3Cu2 trigonal bipyramid, corners with two equivalent O(8)Na2MgCu2 trigonal bipyramids,  an edgeedge with one O(5)Na3Cu2 square pyramid, edges with two equivalent O(1)Na2MgCu2 square pyramids, and edges with two equivalent O(7)Na2MgCu2 trigonal bipyramids. In the fourth O site, O(4) is bonded to one Na(1), one Na(3), one Na(4), one Cu(3), and one Cu(4) atom to form ONa3Cu2 trigonal bipyramids that share  a cornercorner with one O(1)Na2MgCu2 square pyramid, corners with two equivalent O(5)Na3Cu2 square pyramids,  a cornercorner with one O(3)Na2MgCu2 trigonal bipyramid,  a cornercorner with one O(8)Na2MgCu2 trigonal bipyramid,  an edgeedge with one O(7)Na2MgCu2 trigonal bipyramid, and  an edgeedge with one O(8)Na2MgCu2 trigonal bipyramid. In the fifth O site, O(5) is bonded to one Na(1), one Na(2), one Na(3), one Cu(1), and one Cu(2) atom to form distorted ONa3Cu2 square pyramids that share  a cornercorner with one O(8)Na2MgCu2 trigonal bipyramid, corners with two equivalent O(3)Na2MgCu2 trigonal bipyramids, corners with two equivalent O(4)Na3Cu2 trigonal bipyramids, edges with two equivalent O(1)Na2MgCu2 square pyramids,  an edgeedge with one O(3)Na2MgCu2 trigonal bipyramid, and edges with two equivalent O(7)Na2MgCu2 trigonal bipyramids. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Na(2), one Na(4), one Mg(1), one Cu(3), and one Cu(4) atom. In the seventh O site, O(7) is bonded to one Na(1), one Na(3), one Mg(1), one Cu(1), and one Cu(2) atom to form distorted ONa2MgCu2 trigonal bipyramids that share corners with two equivalent O(1)Na2MgCu2 square pyramids,  a cornercorner with one O(8)Na2MgCu2 trigonal bipyramid,  an edgeedge with one O(1)Na2MgCu2 square pyramid, edges with two equivalent O(5)Na3Cu2 square pyramids,  an edgeedge with one O(4)Na3Cu2 trigonal bipyramid, and edges with two equivalent O(3)Na2MgCu2 trigonal bipyramids. In the eighth O site, O(8) is bonded to one Na(2), one Na(4), one Mg(1), one Cu(3), and one Cu(4) atom to form distorted ONa2MgCu2 trigonal bipyramids that share  a cornercorner with one O(5)Na3Cu2 square pyramid,  a cornercorner with one O(7)Na2MgCu2 trigonal bipyramid,  a cornercorner with one O(4)Na3Cu2 trigonal bipyramid, corners with two equivalent O(3)Na2MgCu2 trigonal bipyramids,  an edgeedge with one O(1)Na2MgCu2 square pyramid, and  an edgeedge with one O(4)Na3Cu2 trigonal bipyramid. is represented by the CIF card [CIF]
data_Na4Mg(CuO2)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.541
_cell_length_b   5.657
_cell_length_c   8.882
_cell_angle_alpha   89.823
_cell_angle_beta   69.367
_cell_angle_gamma   75.230
_symmetry_Int_Tables_number   1
_cell_volume   250.785
_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  0.418  0.018  0.445  1.0
  Na  Na1  1  0.621  0.217  0.096  1.0
  Na  Na2  1  0.447  0.507  0.449  1.0
  Na  Na3  1  0.438  0.808  0.827  1.0
  Mg  Mg4  1  0.610  0.716  0.102  1.0
  Cu  Cu5  1  0.044  0.357  0.247  1.0
  Cu  Cu6  1  0.031  0.860  0.253  1.0
  Cu  Cu7  1  0.970  0.132  0.773  1.0
  Cu  Cu8  1  0.994  0.622  0.771  1.0
  O  O9  1  0.294  0.026  0.213  1.0
  O  O10  1  0.186  0.328  0.649  1.0
  O  O11  1  0.294  0.561  0.217  1.0
  O  O12  1  0.210  0.816  0.660  1.0
  O  O13  1  0.788  0.167  0.296  1.0
  O  O14  1  0.753  0.460  0.897  1.0
  O  O15  1  0.784  0.677  0.269  1.0
  O  O16  1  0.773  0.907  0.902  1.0
[/CIF]
.