The compound described by Na6Mg(SbO4)2 crystallizes in the triclinic P1 space group. There are six inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and one O(7) atom. In the second Na site, Na(2) is bonded in a see-saw-like geometry to one O(1), one O(2), one O(3), and one O(7) atom. In the third Na site, Na(3) is bonded in a 3-coordinate geometry to one O(5), one O(6), and one O(8) atom. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and one O(8) atom. In the fifth Na site, Na(5) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form distorted NaO4 trigonal pyramids that share corners with three equivalent Na(6)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Sb(1)O5 trigonal bipyramid, and  an edgeedge with one Sb(1)O5 trigonal bipyramid. In the sixth Na site, Na(6) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form NaO4 tetrahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Sb(1)O5 trigonal bipyramid, corners with three equivalent Na(5)O4 trigonal pyramids, and  an edgeedge with one Sb(1)O5 trigonal bipyramid. Mg(1) is bonded to one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(5)O4 trigonal pyramid, and  an edgeedge with one Sb(1)O5 trigonal bipyramid. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(8) atom to form SbO5 trigonal bipyramids that share  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(5)O4 trigonal pyramid,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Na(5)O4 trigonal pyramid. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(4), and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Na(4), one Na(5), one Na(6), and one Sb(1) atom to form distorted ONa5Sb octahedra that share  a cornercorner with one O(3)Na3MgSb trigonal bipyramid,  a cornercorner with one O(2)Na4Sb trigonal bipyramid,  a cornercorner with one O(6)Na4Sb trigonal bipyramid, corners with two equivalent O(8)Na2MgSb trigonal pyramids,  an edgeedge with one O(5)Na2MgSb tetrahedra,  an edgeedge with one O(7)Na2MgSb tetrahedra,  an edgeedge with one O(3)Na3MgSb trigonal bipyramid, edges with two equivalent O(2)Na4Sb trigonal bipyramids, and  a faceface with one O(6)Na4Sb trigonal bipyramid. In the second O site, O(2) is bonded to one Na(2), one Na(4), one Na(5), one Na(6), and one Sb(1) atom to form distorted ONa4Sb trigonal bipyramids that share  a cornercorner with one O(1)Na5Sb octahedra,  a cornercorner with one O(7)Na2MgSb tetrahedra, corners with two equivalent O(5)Na2MgSb tetrahedra, corners with three equivalent O(6)Na4Sb trigonal bipyramids, edges with two equivalent O(1)Na5Sb octahedra,  an edgeedge with one O(3)Na3MgSb trigonal bipyramid, and  an edgeedge with one O(8)Na2MgSb trigonal pyramid. The corner-sharing octahedral tilt angles are 32°. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(5), one Mg(1), and one Sb(2) atom to form distorted ONa3MgSb trigonal bipyramids that share  a cornercorner with one O(1)Na5Sb octahedra,  a cornercorner with one O(5)Na2MgSb tetrahedra,  a cornercorner with one O(8)Na2MgSb trigonal pyramid,  an edgeedge with one O(1)Na5Sb octahedra, edges with two equivalent O(7)Na2MgSb tetrahedra,  an edgeedge with one O(2)Na4Sb trigonal bipyramid, and  an edgeedge with one O(6)Na4Sb trigonal bipyramid. The corner-sharing octahedral tilt angles are 57°. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(6), one Mg(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded to one Na(3), one Na(4), one Mg(1), and one Sb(1) atom to form distorted ONa2MgSb tetrahedra that share  a cornercorner with one O(7)Na2MgSb tetrahedra,  a cornercorner with one O(3)Na3MgSb trigonal bipyramid, corners with two equivalent O(2)Na4Sb trigonal bipyramids, corners with two equivalent O(6)Na4Sb trigonal bipyramids, corners with two equivalent O(8)Na2MgSb trigonal pyramids,  an edgeedge with one O(1)Na5Sb octahedra, and  an edgeedge with one O(8)Na2MgSb trigonal pyramid. In the sixth O site, O(6) is bonded to one Na(1), one Na(3), one Na(5), one Na(6), and one Sb(1) atom to form distorted ONa4Sb trigonal bipyramids that share  a cornercorner with one O(1)Na5Sb octahedra,  a cornercorner with one O(7)Na2MgSb tetrahedra, corners with two equivalent O(5)Na2MgSb tetrahedra, corners with three equivalent O(2)Na4Sb trigonal bipyramids,  an edgeedge with one O(3)Na3MgSb trigonal bipyramid,  an edgeedge with one O(8)Na2MgSb trigonal pyramid, and  a faceface with one O(1)Na5Sb octahedra. The corner-sharing octahedral tilt angles are 76°. In the seventh O site, O(7) is bonded to one Na(1), one Na(2), one Mg(1), and one Sb(2) atom to form ONa2MgSb tetrahedra that share  a cornercorner with one O(5)Na2MgSb tetrahedra,  a cornercorner with one O(2)Na4Sb trigonal bipyramid,  a cornercorner with one O(6)Na4Sb trigonal bipyramid,  a cornercorner with one O(8)Na2MgSb trigonal pyramid,  an edgeedge with one O(1)Na5Sb octahedra, and edges with two equivalent O(3)Na3MgSb trigonal bipyramids. In the eighth O site, O(8) is bonded to one Na(3), one Na(4), one Mg(1), and one Sb(1) atom to form ONa2MgSb trigonal pyramids that share corners with two equivalent O(1)Na5Sb octahedra,  a cornercorner with one O(7)Na2MgSb tetrahedra, corners with two equivalent O(5)Na2MgSb tetrahedra,  a cornercorner with one O(3)Na3MgSb trigonal bipyramid,  an edgeedge with one O(5)Na2MgSb tetrahedra,  an edgeedge with one O(2)Na4Sb trigonal bipyramid, and  an edgeedge with one O(6)Na4Sb trigonal bipyramid. The corner-sharing octahedral tilt angles range from 15-51°. is represented by the CIF card [CIF]
data_Na6Mg(SbO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.598
_cell_length_b   5.922
_cell_length_c   8.556
_cell_angle_alpha   103.341
_cell_angle_beta   88.380
_cell_angle_gamma   122.602
_symmetry_Int_Tables_number   1
_cell_volume   272.135
_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  0.752  0.763  0.416  1.0
  Na  Na1  1  0.217  0.524  0.496  1.0
  Na  Na2  1  0.638  0.509  0.942  1.0
  Na  Na3  1  0.204  0.653  0.868  1.0
  Na  Na4  1  0.158  0.994  0.627  1.0
  Na  Na5  1  0.693  0.301  0.562  1.0
  Mg  Mg6  1  0.803  0.236  0.186  1.0
  Sb  Sb7  1  0.746  0.024  0.816  1.0
  Sb  Sb8  1  0.195  0.974  0.208  1.0
  O  O9  1  0.977  0.237  0.671  1.0
  O  O10  1  0.457  0.954  0.701  1.0
  O  O11  1  0.080  0.722  0.352  1.0
  O  O12  1  0.534  0.264  0.314  1.0
  O  O13  1  0.889  0.378  0.988  1.0
  O  O14  1  0.776  0.710  0.717  1.0
  O  O15  1  0.003  0.135  0.294  1.0
  O  O16  1  0.591  0.862  0.001  1.0
[/CIF]
.
The compound described by Na6Mg(SbO4)2 crystallizes in the triclinic P1 space group. There are six inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and one O(7) atom. In the second Na site, Na(2) is bonded in a see-saw-like geometry to one O(1), one O(2), one O(3), and one O(7) atom. In the third Na site, Na(3) is bonded in a 3-coordinate geometry to one O(5), one O(6), and one O(8) atom. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and one O(8) atom. In the fifth Na site, Na(5) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form distorted NaO4 trigonal pyramids that share corners with three equivalent Na(6)O4 tetrahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Sb(1)O5 trigonal bipyramid, and  an edgeedge with one Sb(1)O5 trigonal bipyramid. In the sixth Na site, Na(6) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form NaO4 tetrahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one Sb(1)O5 trigonal bipyramid, corners with three equivalent Na(5)O4 trigonal pyramids, and  an edgeedge with one Sb(1)O5 trigonal bipyramid. Mg(1) is bonded to one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(5)O4 trigonal pyramid, and  an edgeedge with one Sb(1)O5 trigonal bipyramid. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(8) atom to form SbO5 trigonal bipyramids that share  a cornercorner with one Na(6)O4 tetrahedra,  a cornercorner with one Na(5)O4 trigonal pyramid,  an edgeedge with one Na(6)O4 tetrahedra,  an edgeedge with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Na(5)O4 trigonal pyramid. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(4), and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Na(1), one Na(2), one Na(4), one Na(5), one Na(6), and one Sb(1) atom to form distorted ONa5Sb octahedra that share  a cornercorner with one O(3)Na3MgSb trigonal bipyramid,  a cornercorner with one O(2)Na4Sb trigonal bipyramid,  a cornercorner with one O(6)Na4Sb trigonal bipyramid, corners with two equivalent O(8)Na2MgSb trigonal pyramids,  an edgeedge with one O(5)Na2MgSb tetrahedra,  an edgeedge with one O(7)Na2MgSb tetrahedra,  an edgeedge with one O(3)Na3MgSb trigonal bipyramid, edges with two equivalent O(2)Na4Sb trigonal bipyramids, and  a faceface with one O(6)Na4Sb trigonal bipyramid. In the second O site, O(2) is bonded to one Na(2), one Na(4), one Na(5), one Na(6), and one Sb(1) atom to form distorted ONa4Sb trigonal bipyramids that share  a cornercorner with one O(1)Na5Sb octahedra,  a cornercorner with one O(7)Na2MgSb tetrahedra, corners with two equivalent O(5)Na2MgSb tetrahedra, corners with three equivalent O(6)Na4Sb trigonal bipyramids, edges with two equivalent O(1)Na5Sb octahedra,  an edgeedge with one O(3)Na3MgSb trigonal bipyramid, and  an edgeedge with one O(8)Na2MgSb trigonal pyramid. The corner-sharing octahedral tilt angles are 32°. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(5), one Mg(1), and one Sb(2) atom to form distorted ONa3MgSb trigonal bipyramids that share  a cornercorner with one O(1)Na5Sb octahedra,  a cornercorner with one O(5)Na2MgSb tetrahedra,  a cornercorner with one O(8)Na2MgSb trigonal pyramid,  an edgeedge with one O(1)Na5Sb octahedra, edges with two equivalent O(7)Na2MgSb tetrahedra,  an edgeedge with one O(2)Na4Sb trigonal bipyramid, and  an edgeedge with one O(6)Na4Sb trigonal bipyramid. The corner-sharing octahedral tilt angles are 57°. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Na(1), one Na(6), one Mg(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded to one Na(3), one Na(4), one Mg(1), and one Sb(1) atom to form distorted ONa2MgSb tetrahedra that share  a cornercorner with one O(7)Na2MgSb tetrahedra,  a cornercorner with one O(3)Na3MgSb trigonal bipyramid, corners with two equivalent O(2)Na4Sb trigonal bipyramids, corners with two equivalent O(6)Na4Sb trigonal bipyramids, corners with two equivalent O(8)Na2MgSb trigonal pyramids,  an edgeedge with one O(1)Na5Sb octahedra, and  an edgeedge with one O(8)Na2MgSb trigonal pyramid. In the sixth O site, O(6) is bonded to one Na(1), one Na(3), one Na(5), one Na(6), and one Sb(1) atom to form distorted ONa4Sb trigonal bipyramids that share  a cornercorner with one O(1)Na5Sb octahedra,  a cornercorner with one O(7)Na2MgSb tetrahedra, corners with two equivalent O(5)Na2MgSb tetrahedra, corners with three equivalent O(2)Na4Sb trigonal bipyramids,  an edgeedge with one O(3)Na3MgSb trigonal bipyramid,  an edgeedge with one O(8)Na2MgSb trigonal pyramid, and  a faceface with one O(1)Na5Sb octahedra. The corner-sharing octahedral tilt angles are 76°. In the seventh O site, O(7) is bonded to one Na(1), one Na(2), one Mg(1), and one Sb(2) atom to form ONa2MgSb tetrahedra that share  a cornercorner with one O(5)Na2MgSb tetrahedra,  a cornercorner with one O(2)Na4Sb trigonal bipyramid,  a cornercorner with one O(6)Na4Sb trigonal bipyramid,  a cornercorner with one O(8)Na2MgSb trigonal pyramid,  an edgeedge with one O(1)Na5Sb octahedra, and edges with two equivalent O(3)Na3MgSb trigonal bipyramids. In the eighth O site, O(8) is bonded to one Na(3), one Na(4), one Mg(1), and one Sb(1) atom to form ONa2MgSb trigonal pyramids that share corners with two equivalent O(1)Na5Sb octahedra,  a cornercorner with one O(7)Na2MgSb tetrahedra, corners with two equivalent O(5)Na2MgSb tetrahedra,  a cornercorner with one O(3)Na3MgSb trigonal bipyramid,  an edgeedge with one O(5)Na2MgSb tetrahedra,  an edgeedge with one O(2)Na4Sb trigonal bipyramid, and  an edgeedge with one O(6)Na4Sb trigonal bipyramid. The corner-sharing octahedral tilt angles range from 15-51°. is represented by the CIF card [CIF]
data_Na6Mg(SbO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.598
_cell_length_b   5.922
_cell_length_c   8.556
_cell_angle_alpha   103.341
_cell_angle_beta   88.380
_cell_angle_gamma   122.602
_symmetry_Int_Tables_number   1
_cell_volume   272.135
_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  0.752  0.763  0.416  1.0
  Na  Na1  1  0.217  0.524  0.496  1.0
  Na  Na2  1  0.638  0.509  0.942  1.0
  Na  Na3  1  0.204  0.653  0.868  1.0
  Na  Na4  1  0.158  0.994  0.627  1.0
  Na  Na5  1  0.693  0.301  0.562  1.0
  Mg  Mg6  1  0.803  0.236  0.186  1.0
  Sb  Sb7  1  0.746  0.024  0.816  1.0
  Sb  Sb8  1  0.195  0.974  0.208  1.0
  O  O9  1  0.977  0.237  0.671  1.0
  O  O10  1  0.457  0.954  0.701  1.0
  O  O11  1  0.080  0.722  0.352  1.0
  O  O12  1  0.534  0.264  0.314  1.0
  O  O13  1  0.889  0.378  0.988  1.0
  O  O14  1  0.776  0.710  0.717  1.0
  O  O15  1  0.003  0.135  0.294  1.0
  O  O16  1  0.591  0.862  0.001  1.0
[/CIF]
.