The compound described by CaSn2(PO4)2 crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), and two equivalent O(8) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. In the second Sn site, Sn(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. In the third Sn site, Sn(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(5) and two equivalent O(7) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(7), and one O(8) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(5), and one O(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Sn(2), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ca(1), one Sn(1), and one P(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Ca(1), one Sn(1), one Sn(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ca(1), one Sn(3), and one P(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Ca(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sn(3) and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one P(1) atom. is represented by the CIF file [CIF]
data_CaSn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.445
_cell_length_b   9.445
_cell_length_c   19.308
_cell_angle_alpha   63.974
_cell_angle_beta   63.974
_cell_angle_gamma   32.453
_symmetry_Int_Tables_number   1
_cell_volume   822.179
_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
  Ca  Ca0  1  0.468  0.864  0.837  1.0
  Ca  Ca1  1  0.136  0.532  0.663  1.0
  Ca  Ca2  1  0.864  0.468  0.337  1.0
  Ca  Ca3  1  0.532  0.136  0.163  1.0
  Sn  Sn4  1  0.182  0.631  0.978  1.0
  Sn  Sn5  1  0.369  0.818  0.522  1.0
  Sn  Sn6  1  0.818  0.369  0.022  1.0
  Sn  Sn7  1  0.500  0.000  0.000  1.0
  Sn  Sn8  1  0.631  0.182  0.478  1.0
  Sn  Sn9  1  0.677  0.323  0.250  1.0
  Sn  Sn10  1  0.323  0.677  0.750  1.0
  Sn  Sn11  1  0.000  0.500  0.500  1.0
  P  P12  1  0.050  0.494  0.865  1.0
  P  P13  1  0.721  0.234  0.616  1.0
  P  P14  1  0.950  0.506  0.135  1.0
  P  P15  1  0.234  0.721  0.116  1.0
  P  P16  1  0.494  0.050  0.365  1.0
  P  P17  1  0.506  0.950  0.635  1.0
  P  P18  1  0.279  0.766  0.384  1.0
  P  P19  1  0.766  0.279  0.884  1.0
  O  O20  1  0.747  0.808  0.106  1.0
  O  O21  1  0.673  0.473  0.920  1.0
  O  O22  1  0.808  0.747  0.606  1.0
  O  O23  1  0.767  0.376  0.558  1.0
  O  O24  1  0.204  0.352  0.069  1.0
  O  O25  1  0.564  0.342  0.696  1.0
  O  O26  1  0.624  0.233  0.942  1.0
  O  O27  1  0.928  0.983  0.125  1.0
  O  O28  1  0.233  0.624  0.442  1.0
  O  O29  1  0.527  0.327  0.580  1.0
  O  O30  1  0.829  0.453  0.141  1.0
  O  O31  1  0.591  0.949  0.291  1.0
  O  O32  1  0.327  0.527  0.080  1.0
  O  O33  1  0.983  0.928  0.625  1.0
  O  O34  1  0.253  0.192  0.894  1.0
  O  O35  1  0.171  0.547  0.859  1.0
  O  O36  1  0.949  0.591  0.791  1.0
  O  O37  1  0.376  0.767  0.058  1.0
  O  O38  1  0.453  0.829  0.641  1.0
  O  O39  1  0.409  0.051  0.709  1.0
  O  O40  1  0.017  0.072  0.375  1.0
  O  O41  1  0.352  0.204  0.569  1.0
  O  O42  1  0.072  0.017  0.875  1.0
  O  O43  1  0.342  0.564  0.196  1.0
  O  O44  1  0.473  0.673  0.420  1.0
  O  O45  1  0.192  0.253  0.394  1.0
  O  O46  1  0.051  0.409  0.209  1.0
  O  O47  1  0.648  0.796  0.431  1.0
  O  O48  1  0.796  0.648  0.931  1.0
  O  O49  1  0.658  0.436  0.804  1.0
  O  O50  1  0.436  0.658  0.304  1.0
  O  O51  1  0.547  0.171  0.359  1.0
[/CIF]
.
The compound described by CaSn2(PO4)2 crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), and two equivalent O(8) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. In the second Sn site, Sn(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. In the third Sn site, Sn(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(5) and two equivalent O(7) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(7), and one O(8) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(5), and one O(6) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ca(1), one Sn(2), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ca(1), one Sn(1), and one P(2) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Ca(1), one Sn(1), one Sn(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ca(1), one Sn(3), and one P(2) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Ca(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sn(3) and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Ca(1) and one P(1) atom. is represented by the CIF file [CIF]
data_CaSn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.445
_cell_length_b   9.445
_cell_length_c   19.308
_cell_angle_alpha   63.974
_cell_angle_beta   63.974
_cell_angle_gamma   32.453
_symmetry_Int_Tables_number   1
_cell_volume   822.179
_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
  Ca  Ca0  1  0.468  0.864  0.837  1.0
  Ca  Ca1  1  0.136  0.532  0.663  1.0
  Ca  Ca2  1  0.864  0.468  0.337  1.0
  Ca  Ca3  1  0.532  0.136  0.163  1.0
  Sn  Sn4  1  0.182  0.631  0.978  1.0
  Sn  Sn5  1  0.369  0.818  0.522  1.0
  Sn  Sn6  1  0.818  0.369  0.022  1.0
  Sn  Sn7  1  0.500  0.000  0.000  1.0
  Sn  Sn8  1  0.631  0.182  0.478  1.0
  Sn  Sn9  1  0.677  0.323  0.250  1.0
  Sn  Sn10  1  0.323  0.677  0.750  1.0
  Sn  Sn11  1  0.000  0.500  0.500  1.0
  P  P12  1  0.050  0.494  0.865  1.0
  P  P13  1  0.721  0.234  0.616  1.0
  P  P14  1  0.950  0.506  0.135  1.0
  P  P15  1  0.234  0.721  0.116  1.0
  P  P16  1  0.494  0.050  0.365  1.0
  P  P17  1  0.506  0.950  0.635  1.0
  P  P18  1  0.279  0.766  0.384  1.0
  P  P19  1  0.766  0.279  0.884  1.0
  O  O20  1  0.747  0.808  0.106  1.0
  O  O21  1  0.673  0.473  0.920  1.0
  O  O22  1  0.808  0.747  0.606  1.0
  O  O23  1  0.767  0.376  0.558  1.0
  O  O24  1  0.204  0.352  0.069  1.0
  O  O25  1  0.564  0.342  0.696  1.0
  O  O26  1  0.624  0.233  0.942  1.0
  O  O27  1  0.928  0.983  0.125  1.0
  O  O28  1  0.233  0.624  0.442  1.0
  O  O29  1  0.527  0.327  0.580  1.0
  O  O30  1  0.829  0.453  0.141  1.0
  O  O31  1  0.591  0.949  0.291  1.0
  O  O32  1  0.327  0.527  0.080  1.0
  O  O33  1  0.983  0.928  0.625  1.0
  O  O34  1  0.253  0.192  0.894  1.0
  O  O35  1  0.171  0.547  0.859  1.0
  O  O36  1  0.949  0.591  0.791  1.0
  O  O37  1  0.376  0.767  0.058  1.0
  O  O38  1  0.453  0.829  0.641  1.0
  O  O39  1  0.409  0.051  0.709  1.0
  O  O40  1  0.017  0.072  0.375  1.0
  O  O41  1  0.352  0.204  0.569  1.0
  O  O42  1  0.072  0.017  0.875  1.0
  O  O43  1  0.342  0.564  0.196  1.0
  O  O44  1  0.473  0.673  0.420  1.0
  O  O45  1  0.192  0.253  0.394  1.0
  O  O46  1  0.051  0.409  0.209  1.0
  O  O47  1  0.648  0.796  0.431  1.0
  O  O48  1  0.796  0.648  0.931  1.0
  O  O49  1  0.658  0.436  0.804  1.0
  O  O50  1  0.436  0.658  0.304  1.0
  O  O51  1  0.547  0.171  0.359  1.0
[/CIF]
.