The crystal structure described by Mg(SnO2)2 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 Sn(6)O6 octahedra, and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-57°. 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 distorted MgO6 octahedra that share corners with three equivalent Sn(2)O4 tetrahedra, corners with three equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with two equivalent Sn(1)O6 octahedra, and edges with two equivalent Sn(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 Sn(2)O4 tetrahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra, and edges with four equivalent Sn(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 distorted MgO6 octahedra that share corners with three equivalent Sn(5)O4 tetrahedra, corners with three equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with two equivalent Sn(4)O6 octahedra, and edges with two equivalent Sn(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 Sn(5)O4 tetrahedra,  a cornercorner with one Sn(7)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra, corners with two equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, and edges with four equivalent Sn(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 Sn(8)O4 tetrahedra, corners with two equivalent Sn(5)O4 tetrahedra,  an edgeedge with one Mg(4)O6 octahedra, and edges with four equivalent Sn(6)O6 octahedra. There are nine inequivalent Sn sites. In the first Sn site, Sn(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 SnO6 octahedra that share  a cornercorner with one Sn(2)O4 tetrahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. In the second Sn site, Sn(2) is bonded to one O(2), one O(9), and two equivalent O(4) atoms to form SnO4 tetrahedra that share  a cornercorner with one Mg(3)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Sn(1)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra, and corners with four equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-68°. In the third Sn site, Sn(3) is bonded in a 6-coordinate geometry to one O(16), one O(3), two equivalent O(1), and two equivalent O(17) atoms. In the fourth Sn site, Sn(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 SnO6 octahedra that share  a cornercorner with one Sn(5)O4 tetrahedra,  a cornercorner with one Sn(7)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra, corners with two equivalent Sn(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 Sn(4)O6 octahedra. In the fifth Sn site, Sn(5) is bonded to one O(15), one O(6), and two equivalent O(10) atoms to form SnO4 tetrahedra that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Sn(4)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, and corners with four equivalent Sn(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-66°. In the sixth Sn site, Sn(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 SnO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Sn(8)O4 tetrahedra, corners with two equivalent Sn(5)O4 tetrahedra,  an edgeedge with one Mg(4)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, and edges with two equivalent Sn(6)O6 octahedra. In the seventh Sn site, Sn(7) is bonded to one O(14), one O(5), and two equivalent O(7) atoms to form SnO4 tetrahedra that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Sn(4)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra, and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-69°. In the eighth Sn site, Sn(8) is bonded to one O(11), one O(18), and two equivalent O(12) atoms to form SnO4 tetrahedra that share  a cornercorner with one Mg(6)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Sn(6)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, and corners with four equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 57-69°. In the ninth Sn site, Sn(9) is bonded in a 4-coordinate geometry to one O(16), one O(8), and two equivalent O(17) atoms. 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 Sn(1), and one Sn(3) atom. In the second O site, O(2) is bonded to one Mg(3), one Sn(2), and two equivalent Sn(1) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(5)MgSn3 tetrahedra, and corners with four equivalent O(7)Mg2Sn2 tetrahedra. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Sn(3), and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded to one Mg(2), one Mg(5), one Sn(2), and one Sn(4) atom to form OMg2Sn2 tetrahedra that share  a cornercorner with one O(4)Mg2Sn2 tetrahedra,  a cornercorner with one O(11)MgSn3 tetrahedra,  a cornercorner with one O(2)MgSn3 tetrahedra,  a cornercorner with one O(5)MgSn3 tetrahedra,  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(7)Mg2Sn2 tetrahedra, corners with two equivalent O(14)MgSn3 tetrahedra, corners with three equivalent O(12)Mg2Sn2 tetrahedra,  an edgeedge with one O(4)Mg2Sn2 tetrahedra,  an edgeedge with one O(6)MgSn3 tetrahedra, and  an edgeedge with one O(9)MgSn3 tetrahedra. In the fifth O site, O(5) is bonded to one Mg(2), one Sn(7), and two equivalent Sn(1) atoms to form OMgSn3 tetrahedra that share  a cornercorner with one O(14)MgSn3 tetrahedra,  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(7)Mg2Sn2 tetrahedra, corners with two equivalent O(2)MgSn3 tetrahedra, and edges with two equivalent O(7)Mg2Sn2 tetrahedra. In the sixth O site, O(6) is bonded to one Mg(5), one Sn(5), and two equivalent Sn(4) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(15)MgSn3 tetrahedra, corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(11)MgSn3 tetrahedra, corners with three equivalent O(14)MgSn3 tetrahedra, corners with four equivalent O(12)Mg2Sn2 tetrahedra,  an edgeedge with one O(9)MgSn3 tetrahedra, and edges with two equivalent O(4)Mg2Sn2 tetrahedra. In the seventh O site, O(7) is bonded to one Mg(2), one Mg(3), one Sn(1), and one Sn(7) atom to form OMg2Sn2 tetrahedra that share  a cornercorner with one O(7)Mg2Sn2 tetrahedra,  a cornercorner with one O(14)MgSn3 tetrahedra,  a cornercorner with one O(5)MgSn3 tetrahedra,  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(2)MgSn3 tetrahedra,  an edgeedge with one O(7)Mg2Sn2 tetrahedra, and  an edgeedge with one O(5)MgSn3 tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(3), one Sn(9), and two equivalent Sn(1) atoms. In the ninth O site, O(9) is bonded to one Mg(2), one Sn(2), and two equivalent Sn(4) atoms to form OMgSn3 tetrahedra that share  a cornercorner with one O(2)MgSn3 tetrahedra,  a cornercorner with one O(5)MgSn3 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(7)Mg2Sn2 tetrahedra, corners with two equivalent O(11)MgSn3 tetrahedra, corners with two equivalent O(14)MgSn3 tetrahedra,  an edgeedge with one O(6)MgSn3 tetrahedra, and edges with two equivalent O(4)Mg2Sn2 tetrahedra. In the tenth O site, O(10) is bonded to one Mg(4), one Mg(6), one Sn(5), and one Sn(6) atom to form OMg2Sn2 tetrahedra that share  a cornercorner with one O(10)Mg2Sn2 tetrahedra,  a cornercorner with one O(11)MgSn3 tetrahedra,  a cornercorner with one O(15)MgSn3 tetrahedra,  a cornercorner with one O(6)MgSn3 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(18)MgSn3 tetrahedra,  a cornercorner with one O(16)Sn4 trigonal pyramid,  an edgeedge with one O(10)Mg2Sn2 tetrahedra, and  an edgeedge with one O(15)MgSn3 tetrahedra. In the eleventh O site, O(11) is bonded to one Mg(4), one Sn(8), and two equivalent Sn(4) atoms to form OMgSn3 tetrahedra that share  a cornercorner with one O(15)MgSn3 tetrahedra,  a cornercorner with one O(18)MgSn3 tetrahedra, corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(6)MgSn3 tetrahedra, corners with two equivalent O(9)MgSn3 tetrahedra,  an edgeedge with one O(14)MgSn3 tetrahedra, and edges with two equivalent O(12)Mg2Sn2 tetrahedra. In the twelfth O site, O(12) is bonded to one Mg(4), one Mg(5), one Sn(4), and one Sn(8) atom to form OMg2Sn2 tetrahedra that share  a cornercorner with one O(12)Mg2Sn2 tetrahedra,  a cornercorner with one O(11)MgSn3 tetrahedra,  a cornercorner with one O(15)MgSn3 tetrahedra,  a cornercorner with one O(18)MgSn3 tetrahedra,  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(6)MgSn3 tetrahedra, corners with three equivalent O(4)Mg2Sn2 tetrahedra,  an edgeedge with one O(12)Mg2Sn2 tetrahedra,  an edgeedge with one O(11)MgSn3 tetrahedra, and  an edgeedge with one O(14)MgSn3 tetrahedra. In the thirteenth O site, O(13) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mg(6), and two equivalent Sn(6) atoms. In the fourteenth O site, O(14) is bonded to one Mg(5), one Sn(7), and two equivalent Sn(4) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(5)MgSn3 tetrahedra, corners with two equivalent O(7)Mg2Sn2 tetrahedra, corners with two equivalent O(9)MgSn3 tetrahedra, corners with three equivalent O(6)MgSn3 tetrahedra, corners with four equivalent O(4)Mg2Sn2 tetrahedra,  an edgeedge with one O(11)MgSn3 tetrahedra, and edges with two equivalent O(12)Mg2Sn2 tetrahedra. In the fifteenth O site, O(15) is bonded to one Mg(4), one Sn(5), and two equivalent Sn(6) atoms to form OMgSn3 tetrahedra that share  a cornercorner with one O(11)MgSn3 tetrahedra,  a cornercorner with one O(6)MgSn3 tetrahedra, corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(18)MgSn3 tetrahedra, corners with two equivalent O(16)Sn4 trigonal pyramids, and edges with two equivalent O(10)Mg2Sn2 tetrahedra. In the sixteenth O site, O(16) is bonded to one Sn(3), one Sn(9), and two equivalent Sn(6) atoms to form distorted OSn4 trigonal pyramids that share corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(15)MgSn3 tetrahedra, and  an edgeedge with one O(18)MgSn3 tetrahedra. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Mg(6), one Sn(3), one Sn(6), and one Sn(9) atom. In the eighteenth O site, O(18) is bonded to one Mg(6), one Sn(8), and two equivalent Sn(6) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(11)MgSn3 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(15)MgSn3 tetrahedra, corners with four equivalent O(10)Mg2Sn2 tetrahedra, and  an edgeedge with one O(16)Sn4 trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(SnO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.398
_cell_length_b   6.398
_cell_length_c   17.080
_cell_angle_alpha   88.876
_cell_angle_beta   88.876
_cell_angle_gamma   59.781
_symmetry_Int_Tables_number   1
_cell_volume   604.039
_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  0.842  0.842  0.949  1.0
  Mg  Mg1  1  0.167  0.167  0.665  1.0
  Mg  Mg2  1  0.335  0.335  0.828  1.0
  Mg  Mg3  1  0.832  0.832  0.335  1.0
  Mg  Mg4  1  0.000  0.000  0.499  1.0
  Mg  Mg5  1  0.662  0.662  0.173  1.0
  Sn  Sn6  1  0.842  0.335  0.831  1.0
  Sn  Sn7  1  0.504  0.504  0.625  1.0
  Sn  Sn8  1  0.498  0.498  0.992  1.0
  Sn  Sn9  1  0.335  0.842  0.831  1.0
  Sn  Sn10  1  0.500  0.000  0.499  1.0
  Sn  Sn11  1  0.167  0.167  0.290  1.0
  Sn  Sn12  1  0.000  0.500  0.499  1.0
  Sn  Sn13  1  0.157  0.665  0.169  1.0
  Sn  Sn14  1  0.833  0.833  0.705  1.0
  Sn  Sn15  1  0.665  0.157  0.169  1.0
  Sn  Sn16  1  0.496  0.496  0.373  1.0
  Sn  Sn17  1  0.157  0.157  0.049  1.0
  O  O18  1  0.674  0.184  0.904  1.0
  O  O19  1  0.506  0.506  0.779  1.0
  O  O20  1  0.184  0.674  0.904  1.0
  O  O21  1  0.669  0.669  0.901  1.0
  O  O22  1  0.324  0.870  0.574  1.0
  O  O23  1  0.023  0.023  0.759  1.0
  O  O24  1  0.169  0.169  0.441  1.0
  O  O25  1  0.462  0.013  0.753  1.0
  O  O26  1  0.870  0.324  0.574  1.0
  O  O27  1  0.171  0.171  0.888  1.0
  O  O28  1  0.315  0.315  0.571  1.0
  O  O29  1  0.013  0.462  0.753  1.0
  O  O30  1  0.978  0.543  0.244  1.0
  O  O31  1  0.686  0.686  0.428  1.0
  O  O32  1  0.129  0.676  0.424  1.0
  O  O33  1  0.543  0.978  0.244  1.0
  O  O34  1  0.841  0.841  0.094  1.0
  O  O35  1  0.831  0.831  0.558  1.0
  O  O36  1  0.972  0.972  0.243  1.0
  O  O37  1  0.676  0.129  0.424  1.0
  O  O38  1  0.333  0.333  0.107  1.0
  O  O39  1  0.825  0.331  0.112  1.0
  O  O40  1  0.487  0.487  0.228  1.0
  O  O41  1  0.331  0.825  0.112  1.0
[/CIF]
.
The crystal structure described by Mg(SnO2)2 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 Sn(6)O6 octahedra, and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-57°. 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 distorted MgO6 octahedra that share corners with three equivalent Sn(2)O4 tetrahedra, corners with three equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Mg(3)O6 octahedra,  an edgeedge with one Mg(5)O6 octahedra, edges with two equivalent Sn(1)O6 octahedra, and edges with two equivalent Sn(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 Sn(2)O4 tetrahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra, and edges with four equivalent Sn(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 distorted MgO6 octahedra that share corners with three equivalent Sn(5)O4 tetrahedra, corners with three equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Mg(5)O6 octahedra,  an edgeedge with one Mg(6)O6 octahedra, edges with two equivalent Sn(4)O6 octahedra, and edges with two equivalent Sn(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 Sn(5)O4 tetrahedra,  a cornercorner with one Sn(7)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra, corners with two equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mg(4)O6 octahedra, and edges with four equivalent Sn(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 Sn(8)O4 tetrahedra, corners with two equivalent Sn(5)O4 tetrahedra,  an edgeedge with one Mg(4)O6 octahedra, and edges with four equivalent Sn(6)O6 octahedra. There are nine inequivalent Sn sites. In the first Sn site, Sn(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 SnO6 octahedra that share  a cornercorner with one Sn(2)O4 tetrahedra, corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra, edges with two equivalent Mg(3)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. In the second Sn site, Sn(2) is bonded to one O(2), one O(9), and two equivalent O(4) atoms to form SnO4 tetrahedra that share  a cornercorner with one Mg(3)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Sn(1)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra, and corners with four equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-68°. In the third Sn site, Sn(3) is bonded in a 6-coordinate geometry to one O(16), one O(3), two equivalent O(1), and two equivalent O(17) atoms. In the fourth Sn site, Sn(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 SnO6 octahedra that share  a cornercorner with one Sn(5)O4 tetrahedra,  a cornercorner with one Sn(7)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra, corners with two equivalent Sn(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 Sn(4)O6 octahedra. In the fifth Sn site, Sn(5) is bonded to one O(15), one O(6), and two equivalent O(10) atoms to form SnO4 tetrahedra that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(6)O6 octahedra, corners with two equivalent Sn(4)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, and corners with four equivalent Sn(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-66°. In the sixth Sn site, Sn(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 SnO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Sn(8)O4 tetrahedra, corners with two equivalent Sn(5)O4 tetrahedra,  an edgeedge with one Mg(4)O6 octahedra, edges with two equivalent Mg(6)O6 octahedra, and edges with two equivalent Sn(6)O6 octahedra. In the seventh Sn site, Sn(7) is bonded to one O(14), one O(5), and two equivalent O(7) atoms to form SnO4 tetrahedra that share  a cornercorner with one Mg(5)O6 octahedra, corners with two equivalent Mg(3)O6 octahedra, corners with two equivalent Sn(4)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra, and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-69°. In the eighth Sn site, Sn(8) is bonded to one O(11), one O(18), and two equivalent O(12) atoms to form SnO4 tetrahedra that share  a cornercorner with one Mg(6)O6 octahedra, corners with two equivalent Mg(5)O6 octahedra, corners with two equivalent Sn(6)O6 octahedra, corners with three equivalent Mg(4)O6 octahedra, and corners with four equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 57-69°. In the ninth Sn site, Sn(9) is bonded in a 4-coordinate geometry to one O(16), one O(8), and two equivalent O(17) atoms. 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 Sn(1), and one Sn(3) atom. In the second O site, O(2) is bonded to one Mg(3), one Sn(2), and two equivalent Sn(1) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(5)MgSn3 tetrahedra, and corners with four equivalent O(7)Mg2Sn2 tetrahedra. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Sn(3), and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded to one Mg(2), one Mg(5), one Sn(2), and one Sn(4) atom to form OMg2Sn2 tetrahedra that share  a cornercorner with one O(4)Mg2Sn2 tetrahedra,  a cornercorner with one O(11)MgSn3 tetrahedra,  a cornercorner with one O(2)MgSn3 tetrahedra,  a cornercorner with one O(5)MgSn3 tetrahedra,  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(7)Mg2Sn2 tetrahedra, corners with two equivalent O(14)MgSn3 tetrahedra, corners with three equivalent O(12)Mg2Sn2 tetrahedra,  an edgeedge with one O(4)Mg2Sn2 tetrahedra,  an edgeedge with one O(6)MgSn3 tetrahedra, and  an edgeedge with one O(9)MgSn3 tetrahedra. In the fifth O site, O(5) is bonded to one Mg(2), one Sn(7), and two equivalent Sn(1) atoms to form OMgSn3 tetrahedra that share  a cornercorner with one O(14)MgSn3 tetrahedra,  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(7)Mg2Sn2 tetrahedra, corners with two equivalent O(2)MgSn3 tetrahedra, and edges with two equivalent O(7)Mg2Sn2 tetrahedra. In the sixth O site, O(6) is bonded to one Mg(5), one Sn(5), and two equivalent Sn(4) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(15)MgSn3 tetrahedra, corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(11)MgSn3 tetrahedra, corners with three equivalent O(14)MgSn3 tetrahedra, corners with four equivalent O(12)Mg2Sn2 tetrahedra,  an edgeedge with one O(9)MgSn3 tetrahedra, and edges with two equivalent O(4)Mg2Sn2 tetrahedra. In the seventh O site, O(7) is bonded to one Mg(2), one Mg(3), one Sn(1), and one Sn(7) atom to form OMg2Sn2 tetrahedra that share  a cornercorner with one O(7)Mg2Sn2 tetrahedra,  a cornercorner with one O(14)MgSn3 tetrahedra,  a cornercorner with one O(5)MgSn3 tetrahedra,  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(2)MgSn3 tetrahedra,  an edgeedge with one O(7)Mg2Sn2 tetrahedra, and  an edgeedge with one O(5)MgSn3 tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(3), one Sn(9), and two equivalent Sn(1) atoms. In the ninth O site, O(9) is bonded to one Mg(2), one Sn(2), and two equivalent Sn(4) atoms to form OMgSn3 tetrahedra that share  a cornercorner with one O(2)MgSn3 tetrahedra,  a cornercorner with one O(5)MgSn3 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(7)Mg2Sn2 tetrahedra, corners with two equivalent O(11)MgSn3 tetrahedra, corners with two equivalent O(14)MgSn3 tetrahedra,  an edgeedge with one O(6)MgSn3 tetrahedra, and edges with two equivalent O(4)Mg2Sn2 tetrahedra. In the tenth O site, O(10) is bonded to one Mg(4), one Mg(6), one Sn(5), and one Sn(6) atom to form OMg2Sn2 tetrahedra that share  a cornercorner with one O(10)Mg2Sn2 tetrahedra,  a cornercorner with one O(11)MgSn3 tetrahedra,  a cornercorner with one O(15)MgSn3 tetrahedra,  a cornercorner with one O(6)MgSn3 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(18)MgSn3 tetrahedra,  a cornercorner with one O(16)Sn4 trigonal pyramid,  an edgeedge with one O(10)Mg2Sn2 tetrahedra, and  an edgeedge with one O(15)MgSn3 tetrahedra. In the eleventh O site, O(11) is bonded to one Mg(4), one Sn(8), and two equivalent Sn(4) atoms to form OMgSn3 tetrahedra that share  a cornercorner with one O(15)MgSn3 tetrahedra,  a cornercorner with one O(18)MgSn3 tetrahedra, corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(4)Mg2Sn2 tetrahedra, corners with two equivalent O(6)MgSn3 tetrahedra, corners with two equivalent O(9)MgSn3 tetrahedra,  an edgeedge with one O(14)MgSn3 tetrahedra, and edges with two equivalent O(12)Mg2Sn2 tetrahedra. In the twelfth O site, O(12) is bonded to one Mg(4), one Mg(5), one Sn(4), and one Sn(8) atom to form OMg2Sn2 tetrahedra that share  a cornercorner with one O(12)Mg2Sn2 tetrahedra,  a cornercorner with one O(11)MgSn3 tetrahedra,  a cornercorner with one O(15)MgSn3 tetrahedra,  a cornercorner with one O(18)MgSn3 tetrahedra,  a cornercorner with one O(9)MgSn3 tetrahedra, corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(6)MgSn3 tetrahedra, corners with three equivalent O(4)Mg2Sn2 tetrahedra,  an edgeedge with one O(12)Mg2Sn2 tetrahedra,  an edgeedge with one O(11)MgSn3 tetrahedra, and  an edgeedge with one O(14)MgSn3 tetrahedra. In the thirteenth O site, O(13) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mg(6), and two equivalent Sn(6) atoms. In the fourteenth O site, O(14) is bonded to one Mg(5), one Sn(7), and two equivalent Sn(4) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(5)MgSn3 tetrahedra, corners with two equivalent O(7)Mg2Sn2 tetrahedra, corners with two equivalent O(9)MgSn3 tetrahedra, corners with three equivalent O(6)MgSn3 tetrahedra, corners with four equivalent O(4)Mg2Sn2 tetrahedra,  an edgeedge with one O(11)MgSn3 tetrahedra, and edges with two equivalent O(12)Mg2Sn2 tetrahedra. In the fifteenth O site, O(15) is bonded to one Mg(4), one Sn(5), and two equivalent Sn(6) atoms to form OMgSn3 tetrahedra that share  a cornercorner with one O(11)MgSn3 tetrahedra,  a cornercorner with one O(6)MgSn3 tetrahedra, corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(18)MgSn3 tetrahedra, corners with two equivalent O(16)Sn4 trigonal pyramids, and edges with two equivalent O(10)Mg2Sn2 tetrahedra. In the sixteenth O site, O(16) is bonded to one Sn(3), one Sn(9), and two equivalent Sn(6) atoms to form distorted OSn4 trigonal pyramids that share corners with two equivalent O(10)Mg2Sn2 tetrahedra, corners with two equivalent O(15)MgSn3 tetrahedra, and  an edgeedge with one O(18)MgSn3 tetrahedra. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Mg(6), one Sn(3), one Sn(6), and one Sn(9) atom. In the eighteenth O site, O(18) is bonded to one Mg(6), one Sn(8), and two equivalent Sn(6) atoms to form distorted OMgSn3 tetrahedra that share  a cornercorner with one O(11)MgSn3 tetrahedra, corners with two equivalent O(12)Mg2Sn2 tetrahedra, corners with two equivalent O(15)MgSn3 tetrahedra, corners with four equivalent O(10)Mg2Sn2 tetrahedra, and  an edgeedge with one O(16)Sn4 trigonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(SnO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.398
_cell_length_b   6.398
_cell_length_c   17.080
_cell_angle_alpha   88.876
_cell_angle_beta   88.876
_cell_angle_gamma   59.781
_symmetry_Int_Tables_number   1
_cell_volume   604.039
_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  0.842  0.842  0.949  1.0
  Mg  Mg1  1  0.167  0.167  0.665  1.0
  Mg  Mg2  1  0.335  0.335  0.828  1.0
  Mg  Mg3  1  0.832  0.832  0.335  1.0
  Mg  Mg4  1  0.000  0.000  0.499  1.0
  Mg  Mg5  1  0.662  0.662  0.173  1.0
  Sn  Sn6  1  0.842  0.335  0.831  1.0
  Sn  Sn7  1  0.504  0.504  0.625  1.0
  Sn  Sn8  1  0.498  0.498  0.992  1.0
  Sn  Sn9  1  0.335  0.842  0.831  1.0
  Sn  Sn10  1  0.500  0.000  0.499  1.0
  Sn  Sn11  1  0.167  0.167  0.290  1.0
  Sn  Sn12  1  0.000  0.500  0.499  1.0
  Sn  Sn13  1  0.157  0.665  0.169  1.0
  Sn  Sn14  1  0.833  0.833  0.705  1.0
  Sn  Sn15  1  0.665  0.157  0.169  1.0
  Sn  Sn16  1  0.496  0.496  0.373  1.0
  Sn  Sn17  1  0.157  0.157  0.049  1.0
  O  O18  1  0.674  0.184  0.904  1.0
  O  O19  1  0.506  0.506  0.779  1.0
  O  O20  1  0.184  0.674  0.904  1.0
  O  O21  1  0.669  0.669  0.901  1.0
  O  O22  1  0.324  0.870  0.574  1.0
  O  O23  1  0.023  0.023  0.759  1.0
  O  O24  1  0.169  0.169  0.441  1.0
  O  O25  1  0.462  0.013  0.753  1.0
  O  O26  1  0.870  0.324  0.574  1.0
  O  O27  1  0.171  0.171  0.888  1.0
  O  O28  1  0.315  0.315  0.571  1.0
  O  O29  1  0.013  0.462  0.753  1.0
  O  O30  1  0.978  0.543  0.244  1.0
  O  O31  1  0.686  0.686  0.428  1.0
  O  O32  1  0.129  0.676  0.424  1.0
  O  O33  1  0.543  0.978  0.244  1.0
  O  O34  1  0.841  0.841  0.094  1.0
  O  O35  1  0.831  0.831  0.558  1.0
  O  O36  1  0.972  0.972  0.243  1.0
  O  O37  1  0.676  0.129  0.424  1.0
  O  O38  1  0.333  0.333  0.107  1.0
  O  O39  1  0.825  0.331  0.112  1.0
  O  O40  1  0.487  0.487  0.228  1.0
  O  O41  1  0.331  0.825  0.112  1.0
[/CIF]
.