The structure described by SnPO4 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted T-shaped geometry to one O(3), one O(5), and one O(6) atom. In the second Sn site, Sn(2) is bonded to one O(1), one O(2), one O(4), one O(7), and one O(8) atom to form distorted SnO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Sn(2)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Sn(2)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sn(2) and one P(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(2) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Sn(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Sn(2) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SnPO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.916
_cell_length_b   8.270
_cell_length_c   18.453
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   750.118
_cell_formula_units_Z   8
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
  Sn  Sn0  1  0.556  0.054  0.779  1.0
  Sn  Sn1  1  0.475  0.179  0.550  1.0
  Sn  Sn2  1  0.975  0.321  0.050  1.0
  Sn  Sn3  1  0.056  0.446  0.279  1.0
  Sn  Sn4  1  0.556  0.554  0.721  1.0
  Sn  Sn5  1  0.475  0.679  0.950  1.0
  Sn  Sn6  1  0.975  0.821  0.450  1.0
  Sn  Sn7  1  0.056  0.946  0.221  1.0
  P  P8  1  0.944  0.251  0.663  1.0
  P  P9  1  0.930  0.229  0.443  1.0
  P  P10  1  0.430  0.271  0.943  1.0
  P  P11  1  0.444  0.249  0.163  1.0
  P  P12  1  0.944  0.751  0.837  1.0
  P  P13  1  0.930  0.729  0.057  1.0
  P  P14  1  0.430  0.771  0.557  1.0
  P  P15  1  0.444  0.749  0.337  1.0
  O  O16  1  0.819  0.050  0.453  1.0
  O  O17  1  0.792  0.119  0.616  1.0
  O  O18  1  0.318  0.081  0.148  1.0
  O  O19  1  0.236  0.173  0.993  1.0
  O  O20  1  0.923  0.199  0.742  1.0
  O  O21  1  0.423  0.218  0.864  1.0
  O  O22  1  0.752  0.245  0.138  1.0
  O  O23  1  0.227  0.242  0.469  1.0
  O  O24  1  0.727  0.258  0.969  1.0
  O  O25  1  0.252  0.255  0.638  1.0
  O  O26  1  0.923  0.282  0.364  1.0
  O  O27  1  0.423  0.301  0.242  1.0
  O  O28  1  0.736  0.327  0.493  1.0
  O  O29  1  0.818  0.419  0.648  1.0
  O  O30  1  0.292  0.381  0.116  1.0
  O  O31  1  0.319  0.450  0.953  1.0
  O  O32  1  0.819  0.550  0.047  1.0
  O  O33  1  0.792  0.619  0.884  1.0
  O  O34  1  0.318  0.581  0.352  1.0
  O  O35  1  0.236  0.673  0.507  1.0
  O  O36  1  0.923  0.699  0.758  1.0
  O  O37  1  0.423  0.718  0.636  1.0
  O  O38  1  0.752  0.745  0.362  1.0
  O  O39  1  0.227  0.742  0.031  1.0
  O  O40  1  0.727  0.758  0.531  1.0
  O  O41  1  0.252  0.755  0.862  1.0
  O  O42  1  0.923  0.782  0.136  1.0
  O  O43  1  0.423  0.801  0.258  1.0
  O  O44  1  0.736  0.827  0.007  1.0
  O  O45  1  0.818  0.919  0.852  1.0
  O  O46  1  0.292  0.881  0.384  1.0
  O  O47  1  0.319  0.950  0.547  1.0
[/CIF]
.
The structure described by SnPO4 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted T-shaped geometry to one O(3), one O(5), and one O(6) atom. In the second Sn site, Sn(2) is bonded to one O(1), one O(2), one O(4), one O(7), and one O(8) atom to form distorted SnO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Sn(2)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(1), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with three equivalent Sn(2)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sn(2) and one P(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(2) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(2) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Sn(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Sn(2) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SnPO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.916
_cell_length_b   8.270
_cell_length_c   18.453
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   750.118
_cell_formula_units_Z   8
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
  Sn  Sn0  1  0.556  0.054  0.779  1.0
  Sn  Sn1  1  0.475  0.179  0.550  1.0
  Sn  Sn2  1  0.975  0.321  0.050  1.0
  Sn  Sn3  1  0.056  0.446  0.279  1.0
  Sn  Sn4  1  0.556  0.554  0.721  1.0
  Sn  Sn5  1  0.475  0.679  0.950  1.0
  Sn  Sn6  1  0.975  0.821  0.450  1.0
  Sn  Sn7  1  0.056  0.946  0.221  1.0
  P  P8  1  0.944  0.251  0.663  1.0
  P  P9  1  0.930  0.229  0.443  1.0
  P  P10  1  0.430  0.271  0.943  1.0
  P  P11  1  0.444  0.249  0.163  1.0
  P  P12  1  0.944  0.751  0.837  1.0
  P  P13  1  0.930  0.729  0.057  1.0
  P  P14  1  0.430  0.771  0.557  1.0
  P  P15  1  0.444  0.749  0.337  1.0
  O  O16  1  0.819  0.050  0.453  1.0
  O  O17  1  0.792  0.119  0.616  1.0
  O  O18  1  0.318  0.081  0.148  1.0
  O  O19  1  0.236  0.173  0.993  1.0
  O  O20  1  0.923  0.199  0.742  1.0
  O  O21  1  0.423  0.218  0.864  1.0
  O  O22  1  0.752  0.245  0.138  1.0
  O  O23  1  0.227  0.242  0.469  1.0
  O  O24  1  0.727  0.258  0.969  1.0
  O  O25  1  0.252  0.255  0.638  1.0
  O  O26  1  0.923  0.282  0.364  1.0
  O  O27  1  0.423  0.301  0.242  1.0
  O  O28  1  0.736  0.327  0.493  1.0
  O  O29  1  0.818  0.419  0.648  1.0
  O  O30  1  0.292  0.381  0.116  1.0
  O  O31  1  0.319  0.450  0.953  1.0
  O  O32  1  0.819  0.550  0.047  1.0
  O  O33  1  0.792  0.619  0.884  1.0
  O  O34  1  0.318  0.581  0.352  1.0
  O  O35  1  0.236  0.673  0.507  1.0
  O  O36  1  0.923  0.699  0.758  1.0
  O  O37  1  0.423  0.718  0.636  1.0
  O  O38  1  0.752  0.745  0.362  1.0
  O  O39  1  0.227  0.742  0.031  1.0
  O  O40  1  0.727  0.758  0.531  1.0
  O  O41  1  0.252  0.755  0.862  1.0
  O  O42  1  0.923  0.782  0.136  1.0
  O  O43  1  0.423  0.801  0.258  1.0
  O  O44  1  0.736  0.827  0.007  1.0
  O  O45  1  0.818  0.919  0.852  1.0
  O  O46  1  0.292  0.881  0.384  1.0
  O  O47  1  0.319  0.950  0.547  1.0
[/CIF]
.