The crystal structure described by MgYSb(PbO3)2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted MgO5 trigonal bipyramids that share  an edgeedge with one Y(1)O6 octahedra and  a faceface with one Y(1)O6 octahedra. Y(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form YO6 octahedra that share  an edgeedge with one Mg(1)O5 trigonal bipyramid and  a faceface with one Mg(1)O5 trigonal bipyramid. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted trigonal non-coplanar geometry to one O(4) and two equivalent O(1) atoms. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(1) atoms. Sb(1) is bonded in a distorted T-shaped geometry to one O(3) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Y(1), one Pb(1), and one Pb(2) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1), one Y(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Y(1), one Pb(2), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1), one Y(1), and one Pb(1) atom. is represented by the CIF card [CIF]
data_YMgSb(PbO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.420
_cell_length_b   7.431
_cell_length_c   6.275
_cell_angle_alpha   50.726
_cell_angle_beta   59.231
_cell_angle_gamma   64.405
_symmetry_Int_Tables_number   1
_cell_volume   196.455
_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
  Y  Y0  1  0.977  0.077  0.969  1.0
  Mg  Mg1  1  0.058  0.555  0.329  1.0
  Sb  Sb2  1  0.578  0.441  0.403  1.0
  Pb  Pb3  1  0.309  0.986  0.397  1.0
  Pb  Pb4  1  0.745  0.790  0.720  1.0
  O  O5  1  0.119  0.800  0.366  1.0
  O  O6  1  0.715  0.800  0.366  1.0
  O  O7  1  0.846  0.276  0.583  1.0
  O  O8  1  0.296  0.276  0.583  1.0
  O  O9  1  0.775  0.359  0.091  1.0
  O  O10  1  0.166  0.775  0.892  1.0
[/CIF]
.
The crystal structure described by MgYSb(PbO3)2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted MgO5 trigonal bipyramids that share  an edgeedge with one Y(1)O6 octahedra and  a faceface with one Y(1)O6 octahedra. Y(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form YO6 octahedra that share  an edgeedge with one Mg(1)O5 trigonal bipyramid and  a faceface with one Mg(1)O5 trigonal bipyramid. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted trigonal non-coplanar geometry to one O(4) and two equivalent O(1) atoms. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(1) atoms. Sb(1) is bonded in a distorted T-shaped geometry to one O(3) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Y(1), one Pb(1), and one Pb(2) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1), one Y(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Y(1), one Pb(2), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1), one Y(1), and one Pb(1) atom. is represented by the CIF card [CIF]
data_YMgSb(PbO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.420
_cell_length_b   7.431
_cell_length_c   6.275
_cell_angle_alpha   50.726
_cell_angle_beta   59.231
_cell_angle_gamma   64.405
_symmetry_Int_Tables_number   1
_cell_volume   196.455
_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
  Y  Y0  1  0.977  0.077  0.969  1.0
  Mg  Mg1  1  0.058  0.555  0.329  1.0
  Sb  Sb2  1  0.578  0.441  0.403  1.0
  Pb  Pb3  1  0.309  0.986  0.397  1.0
  Pb  Pb4  1  0.745  0.790  0.720  1.0
  O  O5  1  0.119  0.800  0.366  1.0
  O  O6  1  0.715  0.800  0.366  1.0
  O  O7  1  0.846  0.276  0.583  1.0
  O  O8  1  0.296  0.276  0.583  1.0
  O  O9  1  0.775  0.359  0.091  1.0
  O  O10  1  0.166  0.775  0.892  1.0
[/CIF]
.