The crystal structure described by MgSnP2O7 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form MgO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. Sn(1) is bonded in a 5-coordinate geometry to one O(5), one O(6), one O(7), and two equivalent O(4) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Mg(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent Mg(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mg(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Sn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Sn(1), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgSnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.241
_cell_length_b   7.195
_cell_length_c   9.337
_cell_angle_alpha   70.161
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   583.955
_cell_formula_units_Z   4
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  0.944  0.300  0.806  1.0
  Mg  Mg1  1  0.444  0.700  0.694  1.0
  Mg  Mg2  1  0.556  0.300  0.306  1.0
  Mg  Mg3  1  0.056  0.700  0.194  1.0
  Sn  Sn4  1  0.087  0.771  0.577  1.0
  Sn  Sn5  1  0.913  0.229  0.423  1.0
  Sn  Sn6  1  0.587  0.229  0.923  1.0
  Sn  Sn7  1  0.413  0.771  0.077  1.0
  P  P8  1  0.751  0.905  0.276  1.0
  P  P9  1  0.211  0.485  0.955  1.0
  P  P10  1  0.749  0.905  0.776  1.0
  P  P11  1  0.289  0.485  0.455  1.0
  P  P12  1  0.251  0.095  0.224  1.0
  P  P13  1  0.711  0.515  0.545  1.0
  P  P14  1  0.789  0.515  0.045  1.0
  P  P15  1  0.249  0.095  0.724  1.0
  O  O16  1  0.189  0.267  0.073  1.0
  O  O17  1  0.591  0.861  0.756  1.0
  O  O18  1  0.909  0.861  0.256  1.0
  O  O19  1  0.366  0.515  0.893  1.0
  O  O20  1  0.811  0.733  0.927  1.0
  O  O21  1  0.152  0.088  0.354  1.0
  O  O22  1  0.634  0.485  0.107  1.0
  O  O23  1  0.097  0.499  0.832  1.0
  O  O24  1  0.315  0.632  0.541  1.0
  O  O25  1  0.848  0.912  0.646  1.0
  O  O26  1  0.348  0.088  0.854  1.0
  O  O27  1  0.767  0.096  0.818  1.0
  O  O28  1  0.267  0.904  0.682  1.0
  O  O29  1  0.311  0.267  0.573  1.0
  O  O30  1  0.652  0.912  0.146  1.0
  O  O31  1  0.091  0.139  0.744  1.0
  O  O32  1  0.233  0.904  0.182  1.0
  O  O33  1  0.903  0.501  0.168  1.0
  O  O34  1  0.185  0.632  0.041  1.0
  O  O35  1  0.815  0.368  0.959  1.0
  O  O36  1  0.866  0.485  0.607  1.0
  O  O37  1  0.403  0.499  0.332  1.0
  O  O38  1  0.597  0.501  0.668  1.0
  O  O39  1  0.409  0.139  0.244  1.0
  O  O40  1  0.733  0.096  0.318  1.0
  O  O41  1  0.134  0.515  0.393  1.0
  O  O42  1  0.685  0.368  0.459  1.0
  O  O43  1  0.689  0.733  0.427  1.0
[/CIF]
.
The crystal structure described by MgSnP2O7 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form MgO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. Sn(1) is bonded in a 5-coordinate geometry to one O(5), one O(6), one O(7), and two equivalent O(4) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Mg(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent Mg(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mg(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Sn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Sn(1), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgSnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.241
_cell_length_b   7.195
_cell_length_c   9.337
_cell_angle_alpha   70.161
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   583.955
_cell_formula_units_Z   4
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  0.944  0.300  0.806  1.0
  Mg  Mg1  1  0.444  0.700  0.694  1.0
  Mg  Mg2  1  0.556  0.300  0.306  1.0
  Mg  Mg3  1  0.056  0.700  0.194  1.0
  Sn  Sn4  1  0.087  0.771  0.577  1.0
  Sn  Sn5  1  0.913  0.229  0.423  1.0
  Sn  Sn6  1  0.587  0.229  0.923  1.0
  Sn  Sn7  1  0.413  0.771  0.077  1.0
  P  P8  1  0.751  0.905  0.276  1.0
  P  P9  1  0.211  0.485  0.955  1.0
  P  P10  1  0.749  0.905  0.776  1.0
  P  P11  1  0.289  0.485  0.455  1.0
  P  P12  1  0.251  0.095  0.224  1.0
  P  P13  1  0.711  0.515  0.545  1.0
  P  P14  1  0.789  0.515  0.045  1.0
  P  P15  1  0.249  0.095  0.724  1.0
  O  O16  1  0.189  0.267  0.073  1.0
  O  O17  1  0.591  0.861  0.756  1.0
  O  O18  1  0.909  0.861  0.256  1.0
  O  O19  1  0.366  0.515  0.893  1.0
  O  O20  1  0.811  0.733  0.927  1.0
  O  O21  1  0.152  0.088  0.354  1.0
  O  O22  1  0.634  0.485  0.107  1.0
  O  O23  1  0.097  0.499  0.832  1.0
  O  O24  1  0.315  0.632  0.541  1.0
  O  O25  1  0.848  0.912  0.646  1.0
  O  O26  1  0.348  0.088  0.854  1.0
  O  O27  1  0.767  0.096  0.818  1.0
  O  O28  1  0.267  0.904  0.682  1.0
  O  O29  1  0.311  0.267  0.573  1.0
  O  O30  1  0.652  0.912  0.146  1.0
  O  O31  1  0.091  0.139  0.744  1.0
  O  O32  1  0.233  0.904  0.182  1.0
  O  O33  1  0.903  0.501  0.168  1.0
  O  O34  1  0.185  0.632  0.041  1.0
  O  O35  1  0.815  0.368  0.959  1.0
  O  O36  1  0.866  0.485  0.607  1.0
  O  O37  1  0.403  0.499  0.332  1.0
  O  O38  1  0.597  0.501  0.668  1.0
  O  O39  1  0.409  0.139  0.244  1.0
  O  O40  1  0.733  0.096  0.318  1.0
  O  O41  1  0.134  0.515  0.393  1.0
  O  O42  1  0.685  0.368  0.459  1.0
  O  O43  1  0.689  0.733  0.427  1.0
[/CIF]
.