The compound described by Bi2MgO4 is Spinel-like structured and crystallizes in the monoclinic Cm space group. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(13), one O(3), and two equivalent O(1) atoms to form MgO4 tetrahedra that share  a cornercorner with one Mg(6)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Bi(6)O6 octahedra, corners with three equivalent Bi(3)O6 octahedra, and corners with four equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-59°. In the second Mg site, Mg(2) is bonded to one O(5), one O(9), two equivalent O(4), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with three equivalent Bi(2)O4 tetrahedra, corners with three equivalent Bi(7)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. In the third Mg site, Mg(3) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(7) atoms to form MgO6 octahedra that share  a cornercorner with one Bi(2)O4 tetrahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Bi(7)O4 tetrahedra,  a cornercorner with one Bi(9)O4 trigonal pyramid,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, and edges with four equivalent Bi(1)O6 octahedra. In the fourth Mg site, Mg(4) is bonded to one O(11), one O(15), two equivalent O(10), and two equivalent O(12) atoms to form MgO6 octahedra that share corners with three equivalent Bi(5)O4 tetrahedra, corners with three equivalent Bi(8)O4 tetrahedra,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with two equivalent Bi(4)O6 octahedra, and edges with two equivalent Bi(6)O6 octahedra. In the fifth Mg site, Mg(5) is bonded to one O(14), one O(6), two equivalent O(12), and two equivalent O(4) atoms to form MgO6 octahedra that share  a cornercorner with one Bi(5)O4 tetrahedra,  a cornercorner with one Bi(7)O4 tetrahedra, corners with two equivalent Bi(2)O4 tetrahedra, corners with two equivalent Bi(8)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, and edges with four equivalent Bi(4)O6 octahedra. In the sixth Mg site, Mg(6) is bonded to one O(13), one O(18), two equivalent O(10), and two equivalent O(17) atoms to form MgO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Bi(8)O4 tetrahedra, corners with two equivalent Bi(5)O4 tetrahedra, corners with two equivalent Bi(9)O4 trigonal pyramids,  an edgeedge with one Mg(4)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, and edges with four equivalent Bi(6)O6 octahedra. There are nine inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form BiO6 octahedra that share  a cornercorner with one Bi(2)O4 tetrahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Bi(7)O4 tetrahedra,  a cornercorner with one Bi(9)O4 trigonal pyramid,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Bi(1)O6 octahedra. In the second Bi site, Bi(2) is bonded to one O(2), one O(9), and two equivalent O(4) atoms to form BiO4 tetrahedra that share  a cornercorner with one Mg(3)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Bi(1)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra, and corners with four equivalent Bi(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-67°. In the third Bi site, Bi(3) is bonded to one O(16), one O(3), two equivalent O(1), and two equivalent O(17) atoms to form BiO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Bi(9)O4 trigonal pyramids,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(6)O6 octahedra. In the fourth Bi site, Bi(4) is bonded to one O(11), one O(12), one O(14), one O(4), one O(6), and one O(9) atom to form BiO6 octahedra that share  a cornercorner with one Bi(5)O4 tetrahedra,  a cornercorner with one Bi(7)O4 tetrahedra, corners with two equivalent Bi(2)O4 tetrahedra, corners with two equivalent Bi(8)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. In the fifth Bi site, Bi(5) is bonded to one O(15), one O(6), and two equivalent O(10) atoms to form BiO4 tetrahedra that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Bi(4)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, and corners with four equivalent Bi(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-69°. In the sixth Bi site, Bi(6) is bonded to one O(10), one O(13), one O(15), one O(16), one O(17), and one O(18) atom to form BiO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Bi(8)O4 tetrahedra, corners with two equivalent Bi(5)O4 tetrahedra, corners with two equivalent Bi(9)O4 trigonal pyramids,  an edgeedge with one Mg(4)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, and edges with two equivalent Bi(6)O6 octahedra. In the seventh Bi site, Bi(7) is bonded to one O(14), one O(5), and two equivalent O(7) atoms to form BiO4 tetrahedra that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Bi(4)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra, and corners with four equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-67°. In the eighth Bi site, Bi(8) is bonded to one O(11), one O(18), and two equivalent O(12) atoms to form BiO4 tetrahedra that share  a cornercorner with one Mg(6)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Bi(6)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, and corners with four equivalent Bi(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-69°. In the ninth Bi site, Bi(9) is bonded to one O(16), one O(8), and two equivalent O(17) atoms to form BiO4 trigonal pyramids that share  a cornercorner with one Mg(3)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Bi(1)O6 octahedra, corners with three equivalent Bi(3)O6 octahedra, and corners with four equivalent Bi(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-73°. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mg(3), one Bi(1), and one Bi(3) atom. In the second O site, O(2) is bonded in a distorted tetrahedral geometry to one Mg(3), one Bi(2), and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Bi(3), and two equivalent Bi(1) atoms. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(2), one Mg(5), one Bi(2), and one Bi(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(2), one Bi(7), and two equivalent Bi(1) atoms. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Mg(5), one Bi(5), and two equivalent Bi(4) atoms. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Mg(2), one Mg(3), one Bi(1), and one Bi(7) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Mg(3), one Bi(9), and two equivalent Bi(1) atoms. In the ninth O site, O(9) is bonded in a rectangular see-saw-like geometry to one Mg(2), one Bi(2), and two equivalent Bi(4) atoms. In the tenth O site, O(10) is bonded to one Mg(4), one Mg(6), one Bi(5), and one Bi(6) atom to form a mixture of distorted corner and edge-sharing OMg2Bi2 tetrahedra. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Mg(4), one Bi(8), and two equivalent Bi(4) atoms. In the twelfth O site, O(12) is bonded to one Mg(4), one Mg(5), one Bi(4), and one Bi(8) atom to form a mixture of distorted corner and edge-sharing OMg2Bi2 trigonal pyramids. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(6), and two equivalent Bi(6) atoms. In the fourteenth O site, O(14) is bonded in a rectangular see-saw-like geometry to one Mg(5), one Bi(7), and two equivalent Bi(4) atoms. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Mg(4), one Bi(5), and two equivalent Bi(6) atoms. In the sixteenth O site, O(16) is bonded in a rectangular see-saw-like geometry to one Bi(3), one Bi(9), and two equivalent Bi(6) atoms. In the seventeenth O site, O(17) is bonded in a distorted rectangular see-saw-like geometry to one Mg(6), one Bi(3), one Bi(6), and one Bi(9) atom. In the eighteenth O site, O(18) is bonded in a distorted rectangular see-saw-like geometry to one Mg(6), one Bi(8), and two equivalent Bi(6) atoms. is represented by the CIF file [CIF]
data_Mg(BiO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.776
_cell_length_b   6.776
_cell_length_c   16.405
_cell_angle_alpha   88.858
_cell_angle_beta   88.858
_cell_angle_gamma   61.539
_symmetry_Int_Tables_number   1
_cell_volume   661.944
_cell_formula_units_Z   6
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
  Mg  Mg0  1  0.337  0.337  0.040  1.0
  Mg  Mg1  1  0.664  0.664  0.339  1.0
  Mg  Mg2  1  0.832  0.832  0.181  1.0
  Mg  Mg3  1  0.336  0.336  0.663  1.0
  Mg  Mg4  1  0.499  0.499  0.501  1.0
  Mg  Mg5  1  0.163  0.163  0.820  1.0
  Bi  Bi6  1  0.839  0.345  0.169  1.0
  Bi  Bi7  1  0.006  0.006  0.378  1.0
  Bi  Bi8  1  0.995  0.995  0.003  1.0
  Bi  Bi9  1  0.345  0.839  0.169  1.0
  Bi  Bi10  1  0.501  0.000  0.502  1.0
  Bi  Bi11  1  0.666  0.666  0.716  1.0
  Bi  Bi12  1  0.000  0.501  0.502  1.0
  Bi  Bi13  1  0.159  0.654  0.832  1.0
  Bi  Bi14  1  0.334  0.334  0.288  1.0
  Bi  Bi15  1  0.654  0.159  0.832  1.0
  Bi  Bi16  1  0.995  0.995  0.618  1.0
  Bi  Bi17  1  0.641  0.641  0.963  1.0
  O  O18  1  0.669  0.169  0.085  1.0
  O  O19  1  0.984  0.984  0.243  1.0
  O  O20  1  0.169  0.669  0.085  1.0
  O  O21  1  0.168  0.168  0.076  1.0
  O  O22  1  0.377  0.790  0.422  1.0
  O  O23  1  0.524  0.524  0.257  1.0
  O  O24  1  0.658  0.658  0.582  1.0
  O  O25  1  0.536  0.956  0.256  1.0
  O  O26  1  0.790  0.377  0.422  1.0
  O  O27  1  0.692  0.692  0.103  1.0
  O  O28  1  0.821  0.821  0.412  1.0
  O  O29  1  0.956  0.536  0.256  1.0
  O  O30  1  0.050  0.462  0.745  1.0
  O  O31  1  0.183  0.183  0.588  1.0
  O  O32  1  0.211  0.618  0.580  1.0
  O  O33  1  0.462  0.050  0.745  1.0
  O  O34  1  0.340  0.340  0.914  1.0
  O  O35  1  0.341  0.341  0.422  1.0
  O  O36  1  0.476  0.476  0.748  1.0
  O  O37  1  0.618  0.211  0.580  1.0
  O  O38  1  0.815  0.815  0.919  1.0
  O  O39  1  0.869  0.316  0.897  1.0
  O  O40  1  0.013  0.013  0.750  1.0
  O  O41  1  0.316  0.869  0.897  1.0
[/CIF]
.
The compound described by Bi2MgO4 is Spinel-like structured and crystallizes in the monoclinic Cm space group. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(13), one O(3), and two equivalent O(1) atoms to form MgO4 tetrahedra that share  a cornercorner with one Mg(6)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Bi(6)O6 octahedra, corners with three equivalent Bi(3)O6 octahedra, and corners with four equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-59°. In the second Mg site, Mg(2) is bonded to one O(5), one O(9), two equivalent O(4), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with three equivalent Bi(2)O4 tetrahedra, corners with three equivalent Bi(7)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. In the third Mg site, Mg(3) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(7) atoms to form MgO6 octahedra that share  a cornercorner with one Bi(2)O4 tetrahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Bi(7)O4 tetrahedra,  a cornercorner with one Bi(9)O4 trigonal pyramid,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, and edges with four equivalent Bi(1)O6 octahedra. In the fourth Mg site, Mg(4) is bonded to one O(11), one O(15), two equivalent O(10), and two equivalent O(12) atoms to form MgO6 octahedra that share corners with three equivalent Bi(5)O4 tetrahedra, corners with three equivalent Bi(8)O4 tetrahedra,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with two equivalent Bi(4)O6 octahedra, and edges with two equivalent Bi(6)O6 octahedra. In the fifth Mg site, Mg(5) is bonded to one O(14), one O(6), two equivalent O(12), and two equivalent O(4) atoms to form MgO6 octahedra that share  a cornercorner with one Bi(5)O4 tetrahedra,  a cornercorner with one Bi(7)O4 tetrahedra, corners with two equivalent Bi(2)O4 tetrahedra, corners with two equivalent Bi(8)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, and edges with four equivalent Bi(4)O6 octahedra. In the sixth Mg site, Mg(6) is bonded to one O(13), one O(18), two equivalent O(10), and two equivalent O(17) atoms to form MgO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Bi(8)O4 tetrahedra, corners with two equivalent Bi(5)O4 tetrahedra, corners with two equivalent Bi(9)O4 trigonal pyramids,  an edgeedge with one Mg(4)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, and edges with four equivalent Bi(6)O6 octahedra. There are nine inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form BiO6 octahedra that share  a cornercorner with one Bi(2)O4 tetrahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Bi(7)O4 tetrahedra,  a cornercorner with one Bi(9)O4 trigonal pyramid,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Bi(1)O6 octahedra. In the second Bi site, Bi(2) is bonded to one O(2), one O(9), and two equivalent O(4) atoms to form BiO4 tetrahedra that share  a cornercorner with one Mg(3)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Bi(1)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra, and corners with four equivalent Bi(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-67°. In the third Bi site, Bi(3) is bonded to one O(16), one O(3), two equivalent O(1), and two equivalent O(17) atoms to form BiO6 octahedra that share corners with three equivalent Mg(1)O4 tetrahedra, corners with three equivalent Bi(9)O4 trigonal pyramids,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with two equivalent Bi(1)O6 octahedra, and edges with two equivalent Bi(6)O6 octahedra. In the fourth Bi site, Bi(4) is bonded to one O(11), one O(12), one O(14), one O(4), one O(6), and one O(9) atom to form BiO6 octahedra that share  a cornercorner with one Bi(5)O4 tetrahedra,  a cornercorner with one Bi(7)O4 tetrahedra, corners with two equivalent Bi(2)O4 tetrahedra, corners with two equivalent Bi(8)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, edges with two equivalent Mg(5)O6 octahedra, and edges with two equivalent Bi(4)O6 octahedra. In the fifth Bi site, Bi(5) is bonded to one O(15), one O(6), and two equivalent O(10) atoms to form BiO4 tetrahedra that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Bi(4)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, and corners with four equivalent Bi(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-69°. In the sixth Bi site, Bi(6) is bonded to one O(10), one O(13), one O(15), one O(16), one O(17), and one O(18) atom to form BiO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Bi(8)O4 tetrahedra, corners with two equivalent Bi(5)O4 tetrahedra, corners with two equivalent Bi(9)O4 trigonal pyramids,  an edgeedge with one Mg(4)O6 octahedra,  an edgeedge with one Bi(3)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, and edges with two equivalent Bi(6)O6 octahedra. In the seventh Bi site, Bi(7) is bonded to one O(14), one O(5), and two equivalent O(7) atoms to form BiO4 tetrahedra that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Bi(4)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra, and corners with four equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-67°. In the eighth Bi site, Bi(8) is bonded to one O(11), one O(18), and two equivalent O(12) atoms to form BiO4 tetrahedra that share  a cornercorner with one Mg(6)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Bi(6)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, and corners with four equivalent Bi(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-69°. In the ninth Bi site, Bi(9) is bonded to one O(16), one O(8), and two equivalent O(17) atoms to form BiO4 trigonal pyramids that share  a cornercorner with one Mg(3)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Bi(1)O6 octahedra, corners with three equivalent Bi(3)O6 octahedra, and corners with four equivalent Bi(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-73°. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mg(3), one Bi(1), and one Bi(3) atom. In the second O site, O(2) is bonded in a distorted tetrahedral geometry to one Mg(3), one Bi(2), and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Bi(3), and two equivalent Bi(1) atoms. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(2), one Mg(5), one Bi(2), and one Bi(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(2), one Bi(7), and two equivalent Bi(1) atoms. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Mg(5), one Bi(5), and two equivalent Bi(4) atoms. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Mg(2), one Mg(3), one Bi(1), and one Bi(7) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Mg(3), one Bi(9), and two equivalent Bi(1) atoms. In the ninth O site, O(9) is bonded in a rectangular see-saw-like geometry to one Mg(2), one Bi(2), and two equivalent Bi(4) atoms. In the tenth O site, O(10) is bonded to one Mg(4), one Mg(6), one Bi(5), and one Bi(6) atom to form a mixture of distorted corner and edge-sharing OMg2Bi2 tetrahedra. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Mg(4), one Bi(8), and two equivalent Bi(4) atoms. In the twelfth O site, O(12) is bonded to one Mg(4), one Mg(5), one Bi(4), and one Bi(8) atom to form a mixture of distorted corner and edge-sharing OMg2Bi2 trigonal pyramids. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(6), and two equivalent Bi(6) atoms. In the fourteenth O site, O(14) is bonded in a rectangular see-saw-like geometry to one Mg(5), one Bi(7), and two equivalent Bi(4) atoms. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Mg(4), one Bi(5), and two equivalent Bi(6) atoms. In the sixteenth O site, O(16) is bonded in a rectangular see-saw-like geometry to one Bi(3), one Bi(9), and two equivalent Bi(6) atoms. In the seventeenth O site, O(17) is bonded in a distorted rectangular see-saw-like geometry to one Mg(6), one Bi(3), one Bi(6), and one Bi(9) atom. In the eighteenth O site, O(18) is bonded in a distorted rectangular see-saw-like geometry to one Mg(6), one Bi(8), and two equivalent Bi(6) atoms. is represented by the CIF file [CIF]
data_Mg(BiO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.776
_cell_length_b   6.776
_cell_length_c   16.405
_cell_angle_alpha   88.858
_cell_angle_beta   88.858
_cell_angle_gamma   61.539
_symmetry_Int_Tables_number   1
_cell_volume   661.944
_cell_formula_units_Z   6
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
  Mg  Mg0  1  0.337  0.337  0.040  1.0
  Mg  Mg1  1  0.664  0.664  0.339  1.0
  Mg  Mg2  1  0.832  0.832  0.181  1.0
  Mg  Mg3  1  0.336  0.336  0.663  1.0
  Mg  Mg4  1  0.499  0.499  0.501  1.0
  Mg  Mg5  1  0.163  0.163  0.820  1.0
  Bi  Bi6  1  0.839  0.345  0.169  1.0
  Bi  Bi7  1  0.006  0.006  0.378  1.0
  Bi  Bi8  1  0.995  0.995  0.003  1.0
  Bi  Bi9  1  0.345  0.839  0.169  1.0
  Bi  Bi10  1  0.501  0.000  0.502  1.0
  Bi  Bi11  1  0.666  0.666  0.716  1.0
  Bi  Bi12  1  0.000  0.501  0.502  1.0
  Bi  Bi13  1  0.159  0.654  0.832  1.0
  Bi  Bi14  1  0.334  0.334  0.288  1.0
  Bi  Bi15  1  0.654  0.159  0.832  1.0
  Bi  Bi16  1  0.995  0.995  0.618  1.0
  Bi  Bi17  1  0.641  0.641  0.963  1.0
  O  O18  1  0.669  0.169  0.085  1.0
  O  O19  1  0.984  0.984  0.243  1.0
  O  O20  1  0.169  0.669  0.085  1.0
  O  O21  1  0.168  0.168  0.076  1.0
  O  O22  1  0.377  0.790  0.422  1.0
  O  O23  1  0.524  0.524  0.257  1.0
  O  O24  1  0.658  0.658  0.582  1.0
  O  O25  1  0.536  0.956  0.256  1.0
  O  O26  1  0.790  0.377  0.422  1.0
  O  O27  1  0.692  0.692  0.103  1.0
  O  O28  1  0.821  0.821  0.412  1.0
  O  O29  1  0.956  0.536  0.256  1.0
  O  O30  1  0.050  0.462  0.745  1.0
  O  O31  1  0.183  0.183  0.588  1.0
  O  O32  1  0.211  0.618  0.580  1.0
  O  O33  1  0.462  0.050  0.745  1.0
  O  O34  1  0.340  0.340  0.914  1.0
  O  O35  1  0.341  0.341  0.422  1.0
  O  O36  1  0.476  0.476  0.748  1.0
  O  O37  1  0.618  0.211  0.580  1.0
  O  O38  1  0.815  0.815  0.919  1.0
  O  O39  1  0.869  0.316  0.897  1.0
  O  O40  1  0.013  0.013  0.750  1.0
  O  O41  1  0.316  0.869  0.897  1.0
[/CIF]
.