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 to one O(1), one O(2), one O(3), one O(7), and one O(8) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Sb(1)O4 trigonal pyramid,  an edgeedge with one Sb(2)O6 octahedra, and  an edgeedge with one Sb(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles are 67°. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the third Na site, Na(3) is bonded in a distorted square co-planar geometry to one O(3), one O(4), one O(5), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(6), one O(7), and one O(8) atom. In the fifth Na site, Na(5) 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 sixth Na site, Na(6) 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(4), and one O(5) atom to form MgO4 tetrahedra that share corners with two equivalent Sb(2)O6 octahedra, corners with two equivalent Na(1)O5 trigonal bipyramids, and corners with two equivalent Sb(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 44-46°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form distorted SbO4 trigonal pyramids that share corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid,  an edgeedge with one Sb(2)O6 octahedra, and  an edgeedge with one Na(1)O5 trigonal bipyramid. In the second Sb site, Sb(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form SbO6 octahedra that share corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid,  an edgeedge with one Na(1)O5 trigonal bipyramid, and  an edgeedge with one Sb(1)O4 trigonal pyramid. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), one Na(6), one Mg(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(4), one Na(5), one Na(6), one Mg(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(5), one Na(6), and one Sb(2) atom to form distorted ONa5Sb octahedra that share  a cornercorner with one O(7)Na3Sb2 trigonal bipyramid,  a cornercorner with one O(8)Na3Sb trigonal pyramid, edges with two equivalent O(6)Na4Sb2 octahedra,  an edgeedge with one O(7)Na3Sb2 trigonal bipyramid, and  an edgeedge with one O(8)Na3Sb trigonal pyramid. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(5), one Na(6), one Mg(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Na(3), one Na(5), one Mg(1), and one Sb(2) atom. In the sixth O site, O(6) is bonded to one Na(3), one Na(4), one Na(5), one Na(6), one Sb(1), and one Sb(2) atom to form distorted ONa4Sb2 octahedra that share  a cornercorner with one O(7)Na3Sb2 trigonal bipyramid, edges with two equivalent O(3)Na5Sb octahedra,  an edgeedge with one O(7)Na3Sb2 trigonal bipyramid, and  an edgeedge with one O(8)Na3Sb trigonal pyramid. In the seventh O site, O(7) is bonded to one Na(1), one Na(2), one Na(4), one Sb(1), and one Sb(2) atom to form distorted ONa3Sb2 trigonal bipyramids that share  a cornercorner with one O(6)Na4Sb2 octahedra,  a cornercorner with one O(3)Na5Sb octahedra, corners with two equivalent O(8)Na3Sb trigonal pyramids,  an edgeedge with one O(6)Na4Sb2 octahedra,  an edgeedge with one O(3)Na5Sb octahedra, and  an edgeedge with one O(8)Na3Sb trigonal pyramid. The corner-sharing octahedral tilt angles range from 62-68°. In the eighth O site, O(8) is bonded to one Na(1), one Na(2), one Na(4), and one Sb(2) atom to form distorted ONa3Sb trigonal pyramids that share  a cornercorner with one O(3)Na5Sb octahedra, corners with two equivalent O(7)Na3Sb2 trigonal bipyramids,  an edgeedge with one O(6)Na4Sb2 octahedra,  an edgeedge with one O(3)Na5Sb octahedra, and  an edgeedge with one O(7)Na3Sb2 trigonal bipyramid. The corner-sharing octahedral tilt angles are 66°. is represented by the CIF card [CIF]
data_Na6Mg(SbO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.343
_cell_length_b   6.223
_cell_length_c   6.566
_cell_angle_alpha   88.939
_cell_angle_beta   93.821
_cell_angle_gamma   116.165
_symmetry_Int_Tables_number   1
_cell_volume   232.107
_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  0.768  0.981  0.362  1.0
  Na  Na1  1  0.231  0.519  0.332  1.0
  Na  Na2  1  0.722  0.516  0.118  1.0
  Na  Na3  1  0.209  0.539  0.923  1.0
  Na  Na4  1  0.308  0.895  0.621  1.0
  Na  Na5  1  0.820  0.530  0.580  1.0
  Mg  Mg6  1  0.355  0.338  0.652  1.0
  Sb  Sb7  1  0.802  0.997  0.844  1.0
  Sb  Sb8  1  0.251  0.020  0.145  1.0
  O  O9  1  0.011  0.257  0.643  1.0
  O  O10  1  0.538  0.690  0.638  1.0
  O  O11  1  0.031  0.773  0.331  1.0
  O  O12  1  0.442  0.239  0.387  1.0
  O  O13  1  0.434  0.238  0.919  1.0
  O  O14  1  0.000  0.808  0.884  1.0
  O  O15  1  0.034  0.187  0.115  1.0
  O  O16  1  0.438  0.838  0.136  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 to one O(1), one O(2), one O(3), one O(7), and one O(8) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Sb(2)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Sb(1)O4 trigonal pyramid,  an edgeedge with one Sb(2)O6 octahedra, and  an edgeedge with one Sb(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles are 67°. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the third Na site, Na(3) is bonded in a distorted square co-planar geometry to one O(3), one O(4), one O(5), and one O(6) atom. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(6), one O(7), and one O(8) atom. In the fifth Na site, Na(5) 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 sixth Na site, Na(6) 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(4), and one O(5) atom to form MgO4 tetrahedra that share corners with two equivalent Sb(2)O6 octahedra, corners with two equivalent Na(1)O5 trigonal bipyramids, and corners with two equivalent Sb(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 44-46°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form distorted SbO4 trigonal pyramids that share corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid,  an edgeedge with one Sb(2)O6 octahedra, and  an edgeedge with one Na(1)O5 trigonal bipyramid. In the second Sb site, Sb(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form SbO6 octahedra that share corners with two equivalent Mg(1)O4 tetrahedra,  a cornercorner with one Na(1)O5 trigonal bipyramid,  an edgeedge with one Na(1)O5 trigonal bipyramid, and  an edgeedge with one Sb(1)O4 trigonal pyramid. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Na(1), one Na(2), one Na(4), one Na(6), one Mg(1), and one Sb(1) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(4), one Na(5), one Na(6), one Mg(1), and one Sb(1) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Na(3), one Na(5), one Na(6), and one Sb(2) atom to form distorted ONa5Sb octahedra that share  a cornercorner with one O(7)Na3Sb2 trigonal bipyramid,  a cornercorner with one O(8)Na3Sb trigonal pyramid, edges with two equivalent O(6)Na4Sb2 octahedra,  an edgeedge with one O(7)Na3Sb2 trigonal bipyramid, and  an edgeedge with one O(8)Na3Sb trigonal pyramid. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Na(2), one Na(3), one Na(5), one Na(6), one Mg(1), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Na(3), one Na(5), one Mg(1), and one Sb(2) atom. In the sixth O site, O(6) is bonded to one Na(3), one Na(4), one Na(5), one Na(6), one Sb(1), and one Sb(2) atom to form distorted ONa4Sb2 octahedra that share  a cornercorner with one O(7)Na3Sb2 trigonal bipyramid, edges with two equivalent O(3)Na5Sb octahedra,  an edgeedge with one O(7)Na3Sb2 trigonal bipyramid, and  an edgeedge with one O(8)Na3Sb trigonal pyramid. In the seventh O site, O(7) is bonded to one Na(1), one Na(2), one Na(4), one Sb(1), and one Sb(2) atom to form distorted ONa3Sb2 trigonal bipyramids that share  a cornercorner with one O(6)Na4Sb2 octahedra,  a cornercorner with one O(3)Na5Sb octahedra, corners with two equivalent O(8)Na3Sb trigonal pyramids,  an edgeedge with one O(6)Na4Sb2 octahedra,  an edgeedge with one O(3)Na5Sb octahedra, and  an edgeedge with one O(8)Na3Sb trigonal pyramid. The corner-sharing octahedral tilt angles range from 62-68°. In the eighth O site, O(8) is bonded to one Na(1), one Na(2), one Na(4), and one Sb(2) atom to form distorted ONa3Sb trigonal pyramids that share  a cornercorner with one O(3)Na5Sb octahedra, corners with two equivalent O(7)Na3Sb2 trigonal bipyramids,  an edgeedge with one O(6)Na4Sb2 octahedra,  an edgeedge with one O(3)Na5Sb octahedra, and  an edgeedge with one O(7)Na3Sb2 trigonal bipyramid. The corner-sharing octahedral tilt angles are 66°. is represented by the CIF card [CIF]
data_Na6Mg(SbO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.343
_cell_length_b   6.223
_cell_length_c   6.566
_cell_angle_alpha   88.939
_cell_angle_beta   93.821
_cell_angle_gamma   116.165
_symmetry_Int_Tables_number   1
_cell_volume   232.107
_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  0.768  0.981  0.362  1.0
  Na  Na1  1  0.231  0.519  0.332  1.0
  Na  Na2  1  0.722  0.516  0.118  1.0
  Na  Na3  1  0.209  0.539  0.923  1.0
  Na  Na4  1  0.308  0.895  0.621  1.0
  Na  Na5  1  0.820  0.530  0.580  1.0
  Mg  Mg6  1  0.355  0.338  0.652  1.0
  Sb  Sb7  1  0.802  0.997  0.844  1.0
  Sb  Sb8  1  0.251  0.020  0.145  1.0
  O  O9  1  0.011  0.257  0.643  1.0
  O  O10  1  0.538  0.690  0.638  1.0
  O  O11  1  0.031  0.773  0.331  1.0
  O  O12  1  0.442  0.239  0.387  1.0
  O  O13  1  0.434  0.238  0.919  1.0
  O  O14  1  0.000  0.808  0.884  1.0
  O  O15  1  0.034  0.187  0.115  1.0
  O  O16  1  0.438  0.838  0.136  1.0
[/CIF]
.