The structure described by Mg2Sn2O5 crystallizes in the orthorhombic Pbam space group. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Sn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted corner-sharing SnO5 square pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mg(1) and two equivalent Sn(1) atoms to form OMg4Sn2 octahedra that share corners with eight equivalent O(2)Mg2Sn2 tetrahedra, edges with two equivalent O(1)Mg4Sn2 octahedra, edges with two equivalent O(2)Mg2Sn2 tetrahedra, and faces with four equivalent O(3)Mg2Sn2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Mg(1) and two equivalent Sn(1) atoms to form OMg2Sn2 tetrahedra that share corners with four equivalent O(1)Mg4Sn2 octahedra, corners with four equivalent O(2)Mg2Sn2 tetrahedra, corners with eight equivalent O(3)Mg2Sn2 trigonal pyramids, and  an edgeedge with one O(1)Mg4Sn2 octahedra. The corner-sharing octahedral tilt angles range from 3-79°. In the third O site, O(3) is bonded to two equivalent Mg(1) and two equivalent Sn(1) atoms to form OMg2Sn2 trigonal pyramids that share corners with eight equivalent O(2)Mg2Sn2 tetrahedra, corners with two equivalent O(3)Mg2Sn2 trigonal pyramids,  an edgeedge with one O(3)Mg2Sn2 trigonal pyramid, and faces with two equivalent O(1)Mg4Sn2 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg2Sn2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.960
_cell_length_b   5.554
_cell_length_c   10.542
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   231.880
_cell_formula_units_Z   2
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  0.500  0.640  0.893  1.0
  Mg  Mg1  1  0.500  0.360  0.107  1.0
  Mg  Mg2  1  0.500  0.140  0.607  1.0
  Mg  Mg3  1  0.500  0.860  0.393  1.0
  Sn  Sn4  1  0.000  0.658  0.612  1.0
  Sn  Sn5  1  0.000  0.342  0.388  1.0
  Sn  Sn6  1  0.000  0.842  0.112  1.0
  Sn  Sn7  1  0.000  0.158  0.888  1.0
  O  O8  1  0.000  0.000  0.500  1.0
  O  O9  1  0.000  0.706  0.298  1.0
  O  O10  1  0.000  0.206  0.202  1.0
  O  O11  1  0.000  0.794  0.798  1.0
  O  O12  1  0.500  0.732  0.099  1.0
  O  O13  1  0.500  0.268  0.901  1.0
  O  O14  1  0.000  0.294  0.702  1.0
  O  O15  1  0.500  0.768  0.599  1.0
  O  O16  1  0.000  0.500  0.000  1.0
  O  O17  1  0.500  0.232  0.401  1.0
[/CIF]
.
The structure described by Mg2Sn2O5 crystallizes in the orthorhombic Pbam space group. Mg(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Sn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted corner-sharing SnO5 square pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Mg(1) and two equivalent Sn(1) atoms to form OMg4Sn2 octahedra that share corners with eight equivalent O(2)Mg2Sn2 tetrahedra, edges with two equivalent O(1)Mg4Sn2 octahedra, edges with two equivalent O(2)Mg2Sn2 tetrahedra, and faces with four equivalent O(3)Mg2Sn2 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Mg(1) and two equivalent Sn(1) atoms to form OMg2Sn2 tetrahedra that share corners with four equivalent O(1)Mg4Sn2 octahedra, corners with four equivalent O(2)Mg2Sn2 tetrahedra, corners with eight equivalent O(3)Mg2Sn2 trigonal pyramids, and  an edgeedge with one O(1)Mg4Sn2 octahedra. The corner-sharing octahedral tilt angles range from 3-79°. In the third O site, O(3) is bonded to two equivalent Mg(1) and two equivalent Sn(1) atoms to form OMg2Sn2 trigonal pyramids that share corners with eight equivalent O(2)Mg2Sn2 tetrahedra, corners with two equivalent O(3)Mg2Sn2 trigonal pyramids,  an edgeedge with one O(3)Mg2Sn2 trigonal pyramid, and faces with two equivalent O(1)Mg4Sn2 octahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg2Sn2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.960
_cell_length_b   5.554
_cell_length_c   10.542
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   231.880
_cell_formula_units_Z   2
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  0.500  0.640  0.893  1.0
  Mg  Mg1  1  0.500  0.360  0.107  1.0
  Mg  Mg2  1  0.500  0.140  0.607  1.0
  Mg  Mg3  1  0.500  0.860  0.393  1.0
  Sn  Sn4  1  0.000  0.658  0.612  1.0
  Sn  Sn5  1  0.000  0.342  0.388  1.0
  Sn  Sn6  1  0.000  0.842  0.112  1.0
  Sn  Sn7  1  0.000  0.158  0.888  1.0
  O  O8  1  0.000  0.000  0.500  1.0
  O  O9  1  0.000  0.706  0.298  1.0
  O  O10  1  0.000  0.206  0.202  1.0
  O  O11  1  0.000  0.794  0.798  1.0
  O  O12  1  0.500  0.732  0.099  1.0
  O  O13  1  0.500  0.268  0.901  1.0
  O  O14  1  0.000  0.294  0.702  1.0
  O  O15  1  0.500  0.768  0.599  1.0
  O  O16  1  0.000  0.500  0.000  1.0
  O  O17  1  0.500  0.232  0.401  1.0
[/CIF]
.