The structure described by MgY4(BiO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to one O(4), one O(7), one O(8), and one O(9) atom. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 5-coordinate geometry to one O(10), one O(12), one O(2), one O(5), and one O(7) atom. In the second Y site, Y(2) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(3), one O(6), one O(8), and one O(9) atom. In the third Y site, Y(3) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(2), one O(4), one O(5), and one O(7) atom. In the fourth Y site, Y(4) is bonded to one O(1), one O(11), one O(3), one O(6), and one O(9) atom to form distorted YO5 trigonal bipyramids that share  a cornercorner with one Bi(2)O5 square pyramid and  an edgeedge with one Bi(2)O5 square pyramid. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(6) atom. In the second Bi site, Bi(2) is bonded to one O(1), one O(11), one O(2), one O(5), and one O(6) atom to form distorted BiO5 square pyramids that share  a cornercorner with one Y(4)O5 trigonal bipyramid and  an edgeedge with one Y(4)O5 trigonal bipyramid. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(10), one O(4), one O(7), and one O(8) atom. In the fourth Bi site, Bi(4) is bonded in a 2-coordinate geometry to one O(3) and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Y(2), one Y(4), one Bi(1), and one Bi(2) atom to form a mixture of distorted corner and edge-sharing OY2Bi2 trigonal pyramids. In the second O site, O(2) is bonded to one Y(1), one Y(3), one Bi(1), and one Bi(2) atom to form distorted OY2Bi2 trigonal pyramids that share corners with two equivalent O(6)Y2Bi2 tetrahedra, corners with two equivalent O(1)Y2Bi2 trigonal pyramids, edges with two equivalent O(5)Y2Bi2 tetrahedra, and  an edgeedge with one O(7)Y2MgBi trigonal pyramid. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Y(2), one Y(4), and one Bi(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Y(3), and one Bi(3) atom. In the fifth O site, O(5) is bonded to one Y(1), one Y(3), one Bi(1), and one Bi(2) atom to form OY2Bi2 tetrahedra that share corners with two equivalent O(6)Y2Bi2 tetrahedra, corners with two equivalent O(1)Y2Bi2 trigonal pyramids, corners with two equivalent O(7)Y2MgBi trigonal pyramids, and edges with two equivalent O(2)Y2Bi2 trigonal pyramids. In the sixth O site, O(6) is bonded to one Y(2), one Y(4), one Bi(1), and one Bi(2) atom to form a mixture of corner and edge-sharing OY2Bi2 tetrahedra. In the seventh O site, O(7) is bonded to one Mg(1), one Y(1), one Y(3), and one Bi(3) atom to form a mixture of distorted corner and edge-sharing OY2MgBi trigonal pyramids. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Y(2), one Bi(3), and one Bi(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mg(1), one Y(2), and one Y(4) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Y(1), one Y(3), and one Bi(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Y(2), one Y(4), one Bi(1), and one Bi(2) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(3), and one Bi(1) atom. is represented by the CIF file [CIF]
data_Y4Mg(BiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.824
_cell_length_b   5.772
_cell_length_c   10.798
_cell_angle_alpha   90.772
_cell_angle_beta   88.439
_cell_angle_gamma   95.980
_symmetry_Int_Tables_number   1
_cell_volume   360.872
_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  0.034  0.962  0.739  1.0
  Y  Y1  1  0.565  0.531  0.266  1.0
  Y  Y2  1  0.456  0.447  0.736  1.0
  Y  Y3  1  0.006  0.034  0.287  1.0
  Mg  Mg4  1  0.280  0.382  0.030  1.0
  Bi  Bi5  1  0.013  0.531  0.509  1.0
  Bi  Bi6  1  0.521  0.980  0.503  1.0
  Bi  Bi7  1  0.552  0.979  0.948  1.0
  Bi  Bi8  1  0.893  0.603  0.988  1.0
  O  O9  1  0.730  0.260  0.366  1.0
  O  O10  1  0.206  0.224  0.611  1.0
  O  O11  1  0.823  0.810  0.152  1.0
  O  O12  1  0.333  0.656  0.894  1.0
  O  O13  1  0.282  0.729  0.628  1.0
  O  O14  1  0.780  0.770  0.412  1.0
  O  O15  1  0.245  0.160  0.884  1.0
  O  O16  1  0.606  0.386  0.068  1.0
  O  O17  1  0.227  0.335  0.215  1.0
  O  O18  1  0.705  0.144  0.780  1.0
  O  O19  1  0.300  0.827  0.360  1.0
  O  O20  1  0.796  0.634  0.665  1.0
[/CIF]
.
The structure described by MgY4(BiO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to one O(4), one O(7), one O(8), and one O(9) atom. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a 5-coordinate geometry to one O(10), one O(12), one O(2), one O(5), and one O(7) atom. In the second Y site, Y(2) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(3), one O(6), one O(8), and one O(9) atom. In the third Y site, Y(3) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(2), one O(4), one O(5), and one O(7) atom. In the fourth Y site, Y(4) is bonded to one O(1), one O(11), one O(3), one O(6), and one O(9) atom to form distorted YO5 trigonal bipyramids that share  a cornercorner with one Bi(2)O5 square pyramid and  an edgeedge with one Bi(2)O5 square pyramid. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(6) atom. In the second Bi site, Bi(2) is bonded to one O(1), one O(11), one O(2), one O(5), and one O(6) atom to form distorted BiO5 square pyramids that share  a cornercorner with one Y(4)O5 trigonal bipyramid and  an edgeedge with one Y(4)O5 trigonal bipyramid. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to one O(10), one O(4), one O(7), and one O(8) atom. In the fourth Bi site, Bi(4) is bonded in a 2-coordinate geometry to one O(3) and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Y(2), one Y(4), one Bi(1), and one Bi(2) atom to form a mixture of distorted corner and edge-sharing OY2Bi2 trigonal pyramids. In the second O site, O(2) is bonded to one Y(1), one Y(3), one Bi(1), and one Bi(2) atom to form distorted OY2Bi2 trigonal pyramids that share corners with two equivalent O(6)Y2Bi2 tetrahedra, corners with two equivalent O(1)Y2Bi2 trigonal pyramids, edges with two equivalent O(5)Y2Bi2 tetrahedra, and  an edgeedge with one O(7)Y2MgBi trigonal pyramid. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Y(2), one Y(4), and one Bi(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Y(3), and one Bi(3) atom. In the fifth O site, O(5) is bonded to one Y(1), one Y(3), one Bi(1), and one Bi(2) atom to form OY2Bi2 tetrahedra that share corners with two equivalent O(6)Y2Bi2 tetrahedra, corners with two equivalent O(1)Y2Bi2 trigonal pyramids, corners with two equivalent O(7)Y2MgBi trigonal pyramids, and edges with two equivalent O(2)Y2Bi2 trigonal pyramids. In the sixth O site, O(6) is bonded to one Y(2), one Y(4), one Bi(1), and one Bi(2) atom to form a mixture of corner and edge-sharing OY2Bi2 tetrahedra. In the seventh O site, O(7) is bonded to one Mg(1), one Y(1), one Y(3), and one Bi(3) atom to form a mixture of distorted corner and edge-sharing OY2MgBi trigonal pyramids. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Y(2), one Bi(3), and one Bi(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mg(1), one Y(2), and one Y(4) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Y(1), one Y(3), and one Bi(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Y(2), one Y(4), one Bi(1), and one Bi(2) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(3), and one Bi(1) atom. is represented by the CIF file [CIF]
data_Y4Mg(BiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.824
_cell_length_b   5.772
_cell_length_c   10.798
_cell_angle_alpha   90.772
_cell_angle_beta   88.439
_cell_angle_gamma   95.980
_symmetry_Int_Tables_number   1
_cell_volume   360.872
_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  0.034  0.962  0.739  1.0
  Y  Y1  1  0.565  0.531  0.266  1.0
  Y  Y2  1  0.456  0.447  0.736  1.0
  Y  Y3  1  0.006  0.034  0.287  1.0
  Mg  Mg4  1  0.280  0.382  0.030  1.0
  Bi  Bi5  1  0.013  0.531  0.509  1.0
  Bi  Bi6  1  0.521  0.980  0.503  1.0
  Bi  Bi7  1  0.552  0.979  0.948  1.0
  Bi  Bi8  1  0.893  0.603  0.988  1.0
  O  O9  1  0.730  0.260  0.366  1.0
  O  O10  1  0.206  0.224  0.611  1.0
  O  O11  1  0.823  0.810  0.152  1.0
  O  O12  1  0.333  0.656  0.894  1.0
  O  O13  1  0.282  0.729  0.628  1.0
  O  O14  1  0.780  0.770  0.412  1.0
  O  O15  1  0.245  0.160  0.884  1.0
  O  O16  1  0.606  0.386  0.068  1.0
  O  O17  1  0.227  0.335  0.215  1.0
  O  O18  1  0.705  0.144  0.780  1.0
  O  O19  1  0.300  0.827  0.360  1.0
  O  O20  1  0.796  0.634  0.665  1.0
[/CIF]
.