The structure described by CaSnO2 crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(6), and two equivalent O(7) atoms. In the second Ca site, Ca(2) is bonded to one O(1), two equivalent O(5), and two equivalent O(8) atoms to form distorted CaO5 trigonal bipyramids that share corners with two equivalent Ca(4)O6 octahedra,  a cornercorner with one Sn(1)O5 trigonal bipyramid,  an edgeedge with one Sn(1)O5 trigonal bipyramid, and edges with two equivalent Ca(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 51-65°. In the third Ca site, Ca(3) is bonded in a 4-coordinate geometry to one O(7), one O(8), and two equivalent O(3) atoms. In the fourth Ca site, Ca(4) is bonded to one O(3), one O(5), two equivalent O(2), and two equivalent O(6) atoms to form CaO6 octahedra that share  a cornercorner with one Sn(1)O5 trigonal bipyramid, corners with two equivalent Ca(2)O5 trigonal bipyramids, edges with two equivalent Ca(4)O6 octahedra, and  an edgeedge with one Sn(1)O5 trigonal bipyramid. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(1), one O(2), one O(5), and two equivalent O(4) atoms to form distorted SnO5 trigonal bipyramids that share  a cornercorner with one Ca(4)O6 octahedra,  a cornercorner with one Ca(2)O5 trigonal bipyramid, corners with two equivalent Sn(1)O5 trigonal bipyramids,  an edgeedge with one Ca(4)O6 octahedra, and  an edgeedge with one Ca(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 71°. In the second Sn site, Sn(2) is bonded in an L-shaped geometry to one O(3) and one O(6) atom. In the third Sn site, Sn(3) is bonded in a water-like geometry to one O(2) and one O(8) atom. In the fourth Sn site, Sn(4) is bonded in a distorted T-shaped geometry to one O(7) and two equivalent O(1) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(2), one Sn(1), and two equivalent Sn(4) atoms. In the second O site, O(2) is bonded to two equivalent Ca(4), one Sn(1), and one Sn(3) atom to form OCa2Sn2 tetrahedra that share corners with two equivalent O(6)Ca4Sn square pyramids,  a cornercorner with one O(8)Ca3Sn tetrahedra, corners with two equivalent O(2)Ca2Sn2 tetrahedra,  a cornercorner with one O(5)Ca3Sn trigonal pyramid, corners with two equivalent O(3)Ca3Sn trigonal pyramids,  an edgeedge with one O(6)Ca4Sn square pyramid, and  an edgeedge with one O(5)Ca3Sn trigonal pyramid. In the third O site, O(3) is bonded to one Ca(4), two equivalent Ca(3), and one Sn(2) atom to form distorted OCa3Sn trigonal pyramids that share  a cornercorner with one O(6)Ca4Sn square pyramid, corners with two equivalent O(2)Ca2Sn2 tetrahedra, corners with two equivalent O(8)Ca3Sn tetrahedra,  a cornercorner with one O(5)Ca3Sn trigonal pyramid, corners with two equivalent O(3)Ca3Sn trigonal pyramids, and  an edgeedge with one O(6)Ca4Sn square pyramid. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Ca(1) and two equivalent Sn(1) atoms. In the fifth O site, O(5) is bonded to one Ca(4), two equivalent Ca(2), and one Sn(1) atom to form distorted OCa3Sn trigonal pyramids that share corners with two equivalent O(6)Ca4Sn square pyramids,  a cornercorner with one O(2)Ca2Sn2 tetrahedra, corners with two equivalent O(8)Ca3Sn tetrahedra,  a cornercorner with one O(3)Ca3Sn trigonal pyramid, corners with two equivalent O(5)Ca3Sn trigonal pyramids,  an edgeedge with one O(2)Ca2Sn2 tetrahedra, and  an edgeedge with one O(8)Ca3Sn tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Ca(1), two equivalent Ca(4), and one Sn(2) atom to form OCa4Sn square pyramids that share corners with two equivalent O(2)Ca2Sn2 tetrahedra,  a cornercorner with one O(3)Ca3Sn trigonal pyramid, corners with two equivalent O(5)Ca3Sn trigonal pyramids, edges with two equivalent O(6)Ca4Sn square pyramids,  an edgeedge with one O(2)Ca2Sn2 tetrahedra, and  an edgeedge with one O(3)Ca3Sn trigonal pyramid. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(3), two equivalent Ca(1), and one Sn(4) atom. In the eighth O site, O(8) is bonded to one Ca(3), two equivalent Ca(2), and one Sn(3) atom to form OCa3Sn tetrahedra that share  a cornercorner with one O(2)Ca2Sn2 tetrahedra, corners with two equivalent O(8)Ca3Sn tetrahedra, corners with two equivalent O(3)Ca3Sn trigonal pyramids, corners with two equivalent O(5)Ca3Sn trigonal pyramids, and  an edgeedge with one O(5)Ca3Sn trigonal pyramid. is represented by the CIF card [CIF]
data_CaSnO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.359
_cell_length_b   9.080
_cell_length_c   9.214
_cell_angle_alpha   97.441
_cell_angle_beta   98.386
_cell_angle_gamma   100.430
_symmetry_Int_Tables_number   1
_cell_volume   269.870
_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  0.977  0.261  0.077  1.0
  Ca  Ca1  1  0.153  0.809  0.899  1.0
  Ca  Ca2  1  0.908  0.087  0.681  1.0
  Ca  Ca3  1  0.012  0.978  0.301  1.0
  Sn  Sn4  1  0.406  0.636  0.170  1.0
  Sn  Sn5  1  0.597  0.319  0.428  1.0
  Sn  Sn6  1  0.425  0.682  0.554  1.0
  Sn  Sn7  1  0.503  0.432  0.791  1.0
  O  O8  1  0.129  0.542  0.930  1.0
  O  O9  1  0.459  0.800  0.360  1.0
  O  O10  1  0.367  0.119  0.524  1.0
  O  O11  1  0.840  0.501  0.199  1.0
  O  O12  1  0.733  0.807  0.079  1.0
  O  O13  1  0.507  0.155  0.218  1.0
  O  O14  1  0.407  0.231  0.886  1.0
  O  O15  1  0.606  0.866  0.742  1.0
[/CIF]
.
The structure described by CaSnO2 crystallizes in the triclinic P1 space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(6), and two equivalent O(7) atoms. In the second Ca site, Ca(2) is bonded to one O(1), two equivalent O(5), and two equivalent O(8) atoms to form distorted CaO5 trigonal bipyramids that share corners with two equivalent Ca(4)O6 octahedra,  a cornercorner with one Sn(1)O5 trigonal bipyramid,  an edgeedge with one Sn(1)O5 trigonal bipyramid, and edges with two equivalent Ca(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 51-65°. In the third Ca site, Ca(3) is bonded in a 4-coordinate geometry to one O(7), one O(8), and two equivalent O(3) atoms. In the fourth Ca site, Ca(4) is bonded to one O(3), one O(5), two equivalent O(2), and two equivalent O(6) atoms to form CaO6 octahedra that share  a cornercorner with one Sn(1)O5 trigonal bipyramid, corners with two equivalent Ca(2)O5 trigonal bipyramids, edges with two equivalent Ca(4)O6 octahedra, and  an edgeedge with one Sn(1)O5 trigonal bipyramid. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(1), one O(2), one O(5), and two equivalent O(4) atoms to form distorted SnO5 trigonal bipyramids that share  a cornercorner with one Ca(4)O6 octahedra,  a cornercorner with one Ca(2)O5 trigonal bipyramid, corners with two equivalent Sn(1)O5 trigonal bipyramids,  an edgeedge with one Ca(4)O6 octahedra, and  an edgeedge with one Ca(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 71°. In the second Sn site, Sn(2) is bonded in an L-shaped geometry to one O(3) and one O(6) atom. In the third Sn site, Sn(3) is bonded in a water-like geometry to one O(2) and one O(8) atom. In the fourth Sn site, Sn(4) is bonded in a distorted T-shaped geometry to one O(7) and two equivalent O(1) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(2), one Sn(1), and two equivalent Sn(4) atoms. In the second O site, O(2) is bonded to two equivalent Ca(4), one Sn(1), and one Sn(3) atom to form OCa2Sn2 tetrahedra that share corners with two equivalent O(6)Ca4Sn square pyramids,  a cornercorner with one O(8)Ca3Sn tetrahedra, corners with two equivalent O(2)Ca2Sn2 tetrahedra,  a cornercorner with one O(5)Ca3Sn trigonal pyramid, corners with two equivalent O(3)Ca3Sn trigonal pyramids,  an edgeedge with one O(6)Ca4Sn square pyramid, and  an edgeedge with one O(5)Ca3Sn trigonal pyramid. In the third O site, O(3) is bonded to one Ca(4), two equivalent Ca(3), and one Sn(2) atom to form distorted OCa3Sn trigonal pyramids that share  a cornercorner with one O(6)Ca4Sn square pyramid, corners with two equivalent O(2)Ca2Sn2 tetrahedra, corners with two equivalent O(8)Ca3Sn tetrahedra,  a cornercorner with one O(5)Ca3Sn trigonal pyramid, corners with two equivalent O(3)Ca3Sn trigonal pyramids, and  an edgeedge with one O(6)Ca4Sn square pyramid. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Ca(1) and two equivalent Sn(1) atoms. In the fifth O site, O(5) is bonded to one Ca(4), two equivalent Ca(2), and one Sn(1) atom to form distorted OCa3Sn trigonal pyramids that share corners with two equivalent O(6)Ca4Sn square pyramids,  a cornercorner with one O(2)Ca2Sn2 tetrahedra, corners with two equivalent O(8)Ca3Sn tetrahedra,  a cornercorner with one O(3)Ca3Sn trigonal pyramid, corners with two equivalent O(5)Ca3Sn trigonal pyramids,  an edgeedge with one O(2)Ca2Sn2 tetrahedra, and  an edgeedge with one O(8)Ca3Sn tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Ca(1), two equivalent Ca(4), and one Sn(2) atom to form OCa4Sn square pyramids that share corners with two equivalent O(2)Ca2Sn2 tetrahedra,  a cornercorner with one O(3)Ca3Sn trigonal pyramid, corners with two equivalent O(5)Ca3Sn trigonal pyramids, edges with two equivalent O(6)Ca4Sn square pyramids,  an edgeedge with one O(2)Ca2Sn2 tetrahedra, and  an edgeedge with one O(3)Ca3Sn trigonal pyramid. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(3), two equivalent Ca(1), and one Sn(4) atom. In the eighth O site, O(8) is bonded to one Ca(3), two equivalent Ca(2), and one Sn(3) atom to form OCa3Sn tetrahedra that share  a cornercorner with one O(2)Ca2Sn2 tetrahedra, corners with two equivalent O(8)Ca3Sn tetrahedra, corners with two equivalent O(3)Ca3Sn trigonal pyramids, corners with two equivalent O(5)Ca3Sn trigonal pyramids, and  an edgeedge with one O(5)Ca3Sn trigonal pyramid. is represented by the CIF card [CIF]
data_CaSnO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.359
_cell_length_b   9.080
_cell_length_c   9.214
_cell_angle_alpha   97.441
_cell_angle_beta   98.386
_cell_angle_gamma   100.430
_symmetry_Int_Tables_number   1
_cell_volume   269.870
_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  0.977  0.261  0.077  1.0
  Ca  Ca1  1  0.153  0.809  0.899  1.0
  Ca  Ca2  1  0.908  0.087  0.681  1.0
  Ca  Ca3  1  0.012  0.978  0.301  1.0
  Sn  Sn4  1  0.406  0.636  0.170  1.0
  Sn  Sn5  1  0.597  0.319  0.428  1.0
  Sn  Sn6  1  0.425  0.682  0.554  1.0
  Sn  Sn7  1  0.503  0.432  0.791  1.0
  O  O8  1  0.129  0.542  0.930  1.0
  O  O9  1  0.459  0.800  0.360  1.0
  O  O10  1  0.367  0.119  0.524  1.0
  O  O11  1  0.840  0.501  0.199  1.0
  O  O12  1  0.733  0.807  0.079  1.0
  O  O13  1  0.507  0.155  0.218  1.0
  O  O14  1  0.407  0.231  0.886  1.0
  O  O15  1  0.606  0.866  0.742  1.0
[/CIF]
.