The compound described by LiSnPO4 crystallizes in the trigonal P31c space group. Li(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form LiO4 tetrahedra that share corners with three equivalent Sn(1)O5 square pyramids,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. Sn(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(6) atom to form distorted SnO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, and edges with two equivalent Sn(1)O5 square pyramids. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(5) and three equivalent O(1) atoms to form PO4 tetrahedra that share corners with three equivalent Sn(1)O5 square pyramids and corners with six equivalent Li(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(4) and three equivalent O(2) atoms to form PO4 tetrahedra that share corners with six equivalent Sn(1)O5 square pyramids and corners with three equivalent Li(1)O4 tetrahedra. In the third P site, P(3) is bonded to one O(6) and three equivalent O(3) atoms to form PO4 tetrahedra that share corners with six equivalent Sn(1)O5 square pyramids and corners with three equivalent Li(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Sn(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Sn(1), and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Sn(1), and one P(3) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to three equivalent Sn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal pyramidal geometry to three equivalent Li(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to three equivalent Sn(1) and one P(3) atom. is represented by the CIF file [CIF]
data_LiSnPO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.958
_cell_length_b   7.958
_cell_length_c   10.273
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   563.377
_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
  Li  Li0  1  0.211  0.979  0.252  1.0
  Li  Li1  1  0.021  0.233  0.252  1.0
  Li  Li2  1  0.233  0.021  0.752  1.0
  Li  Li3  1  0.767  0.789  0.252  1.0
  Li  Li4  1  0.789  0.767  0.752  1.0
  Li  Li5  1  0.979  0.211  0.752  1.0
  Sn  Sn6  1  0.006  0.575  0.473  1.0
  Sn  Sn7  1  0.569  0.994  0.473  1.0
  Sn  Sn8  1  0.425  0.431  0.473  1.0
  Sn  Sn9  1  0.431  0.425  0.973  1.0
  Sn  Sn10  1  0.575  0.006  0.973  1.0
  Sn  Sn11  1  0.994  0.569  0.973  1.0
  P  P12  1  0.000  0.000  0.500  1.0
  P  P13  1  0.000  0.000  1.000  1.0
  P  P14  1  0.333  0.667  0.195  1.0
  P  P15  1  0.333  0.667  0.754  1.0
  P  P16  1  0.667  0.333  0.695  1.0
  P  P17  1  0.667  0.333  0.254  1.0
  O  O18  1  0.098  0.887  0.443  1.0
  O  O19  1  0.222  0.770  0.145  1.0
  O  O20  1  0.230  0.776  0.807  1.0
  O  O21  1  0.224  0.454  0.807  1.0
  O  O22  1  0.333  0.667  0.346  1.0
  O  O23  1  0.000  0.000  0.150  1.0
  O  O24  1  0.333  0.667  0.604  1.0
  O  O25  1  0.113  0.211  0.443  1.0
  O  O26  1  0.230  0.452  0.145  1.0
  O  O27  1  0.548  0.778  0.145  1.0
  O  O28  1  0.211  0.113  0.943  1.0
  O  O29  1  0.546  0.770  0.807  1.0
  O  O30  1  0.452  0.230  0.645  1.0
  O  O31  1  0.789  0.902  0.443  1.0
  O  O32  1  0.454  0.224  0.307  1.0
  O  O33  1  0.770  0.546  0.307  1.0
  O  O34  1  0.667  0.333  0.846  1.0
  O  O35  1  0.667  0.333  0.104  1.0
  O  O36  1  0.902  0.789  0.943  1.0
  O  O37  1  0.778  0.548  0.645  1.0
  O  O38  1  0.770  0.222  0.645  1.0
  O  O39  1  0.776  0.230  0.307  1.0
  O  O40  1  0.887  0.098  0.943  1.0
  O  O41  1  0.000  0.000  0.650  1.0
[/CIF]
.
The compound described by LiSnPO4 crystallizes in the trigonal P31c space group. Li(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form LiO4 tetrahedra that share corners with three equivalent Sn(1)O5 square pyramids,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. Sn(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(6) atom to form distorted SnO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, and edges with two equivalent Sn(1)O5 square pyramids. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(5) and three equivalent O(1) atoms to form PO4 tetrahedra that share corners with three equivalent Sn(1)O5 square pyramids and corners with six equivalent Li(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(4) and three equivalent O(2) atoms to form PO4 tetrahedra that share corners with six equivalent Sn(1)O5 square pyramids and corners with three equivalent Li(1)O4 tetrahedra. In the third P site, P(3) is bonded to one O(6) and three equivalent O(3) atoms to form PO4 tetrahedra that share corners with six equivalent Sn(1)O5 square pyramids and corners with three equivalent Li(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Sn(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Sn(1), and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Sn(1), and one P(3) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to three equivalent Sn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal pyramidal geometry to three equivalent Li(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to three equivalent Sn(1) and one P(3) atom. is represented by the CIF file [CIF]
data_LiSnPO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.958
_cell_length_b   7.958
_cell_length_c   10.273
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   563.377
_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
  Li  Li0  1  0.211  0.979  0.252  1.0
  Li  Li1  1  0.021  0.233  0.252  1.0
  Li  Li2  1  0.233  0.021  0.752  1.0
  Li  Li3  1  0.767  0.789  0.252  1.0
  Li  Li4  1  0.789  0.767  0.752  1.0
  Li  Li5  1  0.979  0.211  0.752  1.0
  Sn  Sn6  1  0.006  0.575  0.473  1.0
  Sn  Sn7  1  0.569  0.994  0.473  1.0
  Sn  Sn8  1  0.425  0.431  0.473  1.0
  Sn  Sn9  1  0.431  0.425  0.973  1.0
  Sn  Sn10  1  0.575  0.006  0.973  1.0
  Sn  Sn11  1  0.994  0.569  0.973  1.0
  P  P12  1  0.000  0.000  0.500  1.0
  P  P13  1  0.000  0.000  1.000  1.0
  P  P14  1  0.333  0.667  0.195  1.0
  P  P15  1  0.333  0.667  0.754  1.0
  P  P16  1  0.667  0.333  0.695  1.0
  P  P17  1  0.667  0.333  0.254  1.0
  O  O18  1  0.098  0.887  0.443  1.0
  O  O19  1  0.222  0.770  0.145  1.0
  O  O20  1  0.230  0.776  0.807  1.0
  O  O21  1  0.224  0.454  0.807  1.0
  O  O22  1  0.333  0.667  0.346  1.0
  O  O23  1  0.000  0.000  0.150  1.0
  O  O24  1  0.333  0.667  0.604  1.0
  O  O25  1  0.113  0.211  0.443  1.0
  O  O26  1  0.230  0.452  0.145  1.0
  O  O27  1  0.548  0.778  0.145  1.0
  O  O28  1  0.211  0.113  0.943  1.0
  O  O29  1  0.546  0.770  0.807  1.0
  O  O30  1  0.452  0.230  0.645  1.0
  O  O31  1  0.789  0.902  0.443  1.0
  O  O32  1  0.454  0.224  0.307  1.0
  O  O33  1  0.770  0.546  0.307  1.0
  O  O34  1  0.667  0.333  0.846  1.0
  O  O35  1  0.667  0.333  0.104  1.0
  O  O36  1  0.902  0.789  0.943  1.0
  O  O37  1  0.778  0.548  0.645  1.0
  O  O38  1  0.770  0.222  0.645  1.0
  O  O39  1  0.776  0.230  0.307  1.0
  O  O40  1  0.887  0.098  0.943  1.0
  O  O41  1  0.000  0.000  0.650  1.0
[/CIF]
.