The compound described by Ca(SnO2)2 is Spinel-like structured and crystallizes in the monoclinic Cm space group. There are six inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(13), one O(3), and two equivalent O(1) atoms to form CaO4 tetrahedra that share  a cornercorner with one Ca(6)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent Sn(6)O6 octahedra, and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-66°. In the second Ca site, Ca(2) is bonded to one O(5), one O(9), two equivalent O(4), and two equivalent O(7) atoms to form distorted CaO6 octahedra that share corners with three equivalent Sn(2)O4 tetrahedra, corners with three equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one Ca(5)O6 octahedra, edges with two equivalent Sn(1)O6 octahedra, and edges with two equivalent Sn(4)O6 octahedra. In the third Ca site, Ca(3) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(7) atoms to form distorted CaO6 octahedra that share  a cornercorner with one Sn(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra, and edges with four equivalent Sn(1)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to one O(11), one O(15), two equivalent O(10), and two equivalent O(12) atoms to form distorted CaO6 octahedra that share corners with three equivalent Sn(5)O4 tetrahedra, corners with three equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Ca(5)O6 octahedra,  an edgeedge with one Ca(6)O6 octahedra, edges with two equivalent Sn(4)O6 octahedra, and edges with two equivalent Sn(6)O6 octahedra. In the fifth Ca site, Ca(5) is bonded to one O(14), one O(6), two equivalent O(12), and two equivalent O(4) atoms to form distorted CaO6 octahedra that share  a cornercorner with one Sn(5)O4 tetrahedra,  a cornercorner with one Sn(7)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra, corners with two equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, and edges with four equivalent Sn(4)O6 octahedra. In the sixth Ca site, Ca(6) is bonded to one O(13), one O(18), two equivalent O(10), and two equivalent O(17) atoms to form CaO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra,  a cornercorner with one Sn(8)O4 tetrahedra, corners with two equivalent Sn(5)O4 tetrahedra,  an edgeedge with one Ca(4)O6 octahedra, and edges with four equivalent Sn(6)O6 octahedra. There are nine inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form SnO6 octahedra that share  a cornercorner with one Sn(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra, edges with two equivalent Ca(3)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. In the second Sn site, Sn(2) is bonded to one O(2), one O(9), and two equivalent O(4) atoms to form distorted SnO4 tetrahedra that share  a cornercorner with one Ca(3)O6 octahedra, corners with two equivalent Ca(5)O6 octahedra, corners with two equivalent Sn(1)O6 octahedra, corners with three equivalent Ca(2)O6 octahedra, and corners with four equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-74°. In the third Sn site, Sn(3) is bonded in a 6-coordinate geometry to one O(16), one O(3), two equivalent O(1), and two equivalent O(17) atoms. In the fourth Sn site, Sn(4) is bonded to one O(11), one O(12), one O(14), one O(4), one O(6), and one O(9) atom to form SnO6 octahedra that share  a cornercorner with one Sn(5)O4 tetrahedra,  a cornercorner with one Sn(7)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra, corners with two equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent Ca(5)O6 octahedra, and edges with two equivalent Sn(4)O6 octahedra. In the fifth Sn site, Sn(5) is bonded to one O(15), one O(6), and two equivalent O(10) atoms to form distorted SnO4 tetrahedra that share  a cornercorner with one Ca(5)O6 octahedra, corners with two equivalent Ca(6)O6 octahedra, corners with two equivalent Sn(4)O6 octahedra, corners with three equivalent Ca(4)O6 octahedra, and corners with four equivalent Sn(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-74°. In the sixth Sn site, Sn(6) is bonded to one O(10), one O(13), one O(15), one O(16), one O(17), and one O(18) atom to form SnO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra,  a cornercorner with one Sn(8)O4 tetrahedra, corners with two equivalent Sn(5)O4 tetrahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent Ca(6)O6 octahedra, and edges with two equivalent Sn(6)O6 octahedra. In the seventh Sn site, Sn(7) is bonded to one O(14), one O(5), and two equivalent O(7) atoms to form distorted SnO4 tetrahedra that share  a cornercorner with one Ca(5)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent Sn(4)O6 octahedra, corners with three equivalent Ca(2)O6 octahedra, and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-73°. In the eighth Sn site, Sn(8) is bonded to one O(11), one O(18), and two equivalent O(12) atoms to form distorted SnO4 tetrahedra that share  a cornercorner with one Ca(6)O6 octahedra, corners with two equivalent Ca(5)O6 octahedra, corners with two equivalent Sn(6)O6 octahedra, corners with three equivalent Ca(4)O6 octahedra, and corners with four equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-74°. In the ninth Sn site, Sn(9) is bonded in a 4-coordinate geometry to one O(16), one O(8), and two equivalent O(17) atoms. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(3), one Sn(1), and one Sn(3) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(1)Ca2Sn2 tetrahedra,  a cornercorner with one O(5)CaSn3 tetrahedra, corners with three equivalent O(7)Ca2Sn2 tetrahedra,  a cornercorner with one O(16)Sn4 trigonal pyramid, and  an edgeedge with one O(1)Ca2Sn2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(3), one Sn(2), and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Sn(3), and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded to one Ca(2), one Ca(5), one Sn(2), and one Sn(4) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(4)Ca2Sn2 tetrahedra,  a cornercorner with one O(11)CaSn3 tetrahedra,  a cornercorner with one O(5)CaSn3 tetrahedra,  a cornercorner with one O(9)CaSn3 tetrahedra, corners with two equivalent O(7)Ca2Sn2 tetrahedra, corners with three equivalent O(12)Ca2Sn2 tetrahedra,  an edgeedge with one O(4)Ca2Sn2 tetrahedra, and  an edgeedge with one O(9)CaSn3 tetrahedra. In the fifth O site, O(5) is bonded to one Ca(2), one Sn(7), and two equivalent Sn(1) atoms to form distorted OCaSn3 tetrahedra that share  a cornercorner with one O(9)CaSn3 tetrahedra, corners with two equivalent O(1)Ca2Sn2 tetrahedra, corners with two equivalent O(4)Ca2Sn2 tetrahedra, corners with two equivalent O(7)Ca2Sn2 tetrahedra, and edges with two equivalent O(7)Ca2Sn2 tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(5), one Sn(5), and two equivalent Sn(4) atoms. In the seventh O site, O(7) is bonded to one Ca(2), one Ca(3), one Sn(1), and one Sn(7) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(7)Ca2Sn2 tetrahedra,  a cornercorner with one O(5)CaSn3 tetrahedra,  a cornercorner with one O(9)CaSn3 tetrahedra, corners with two equivalent O(4)Ca2Sn2 tetrahedra, corners with three equivalent O(1)Ca2Sn2 tetrahedra,  an edgeedge with one O(7)Ca2Sn2 tetrahedra, and  an edgeedge with one O(5)CaSn3 tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ca(3), one Sn(9), and two equivalent Sn(1) atoms. In the ninth O site, O(9) is bonded to one Ca(2), one Sn(2), and two equivalent Sn(4) atoms to form distorted OCaSn3 tetrahedra that share  a cornercorner with one O(5)CaSn3 tetrahedra, corners with two equivalent O(12)Ca2Sn2 tetrahedra, corners with two equivalent O(4)Ca2Sn2 tetrahedra, corners with two equivalent O(7)Ca2Sn2 tetrahedra, corners with two equivalent O(11)CaSn3 tetrahedra, and edges with two equivalent O(4)Ca2Sn2 tetrahedra. In the tenth O site, O(10) is bonded to one Ca(4), one Ca(6), one Sn(5), and one Sn(6) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(10)Ca2Sn2 tetrahedra,  a cornercorner with one O(11)CaSn3 tetrahedra,  a cornercorner with one O(15)CaSn3 tetrahedra, corners with two equivalent O(12)Ca2Sn2 tetrahedra,  a cornercorner with one O(16)Sn4 trigonal pyramid,  an edgeedge with one O(10)Ca2Sn2 tetrahedra, and  an edgeedge with one O(15)CaSn3 tetrahedra. In the eleventh O site, O(11) is bonded to one Ca(4), one Sn(8), and two equivalent Sn(4) atoms to form distorted OCaSn3 tetrahedra that share  a cornercorner with one O(15)CaSn3 tetrahedra, corners with two equivalent O(10)Ca2Sn2 tetrahedra, corners with two equivalent O(12)Ca2Sn2 tetrahedra, corners with two equivalent O(4)Ca2Sn2 tetrahedra, corners with two equivalent O(9)CaSn3 tetrahedra, and edges with two equivalent O(12)Ca2Sn2 tetrahedra. In the twelfth O site, O(12) is bonded to one Ca(4), one Ca(5), one Sn(4), and one Sn(8) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(12)Ca2Sn2 tetrahedra,  a cornercorner with one O(11)CaSn3 tetrahedra,  a cornercorner with one O(15)CaSn3 tetrahedra,  a cornercorner with one O(9)CaSn3 tetrahedra, corners with two equivalent O(10)Ca2Sn2 tetrahedra, corners with three equivalent O(4)Ca2Sn2 tetrahedra,  an edgeedge with one O(12)Ca2Sn2 tetrahedra, and  an edgeedge with one O(11)CaSn3 tetrahedra. In the thirteenth O site, O(13) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Ca(6), and two equivalent Sn(6) atoms. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(5), one Sn(7), and two equivalent Sn(4) atoms. In the fifteenth O site, O(15) is bonded to one Ca(4), one Sn(5), and two equivalent Sn(6) atoms to form distorted OCaSn3 tetrahedra that share  a cornercorner with one O(11)CaSn3 tetrahedra, corners with two equivalent O(10)Ca2Sn2 tetrahedra, corners with two equivalent O(12)Ca2Sn2 tetrahedra, corners with two equivalent O(16)Sn4 trigonal pyramids, and edges with two equivalent O(10)Ca2Sn2 tetrahedra. In the sixteenth O site, O(16) is bonded to one Sn(3), one Sn(9), and two equivalent Sn(6) atoms to form distorted OSn4 trigonal pyramids that share corners with two equivalent O(1)Ca2Sn2 tetrahedra, corners with two equivalent O(10)Ca2Sn2 tetrahedra, and corners with two equivalent O(15)CaSn3 tetrahedra. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Ca(6), one Sn(3), one Sn(6), and one Sn(9) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Ca(6), one Sn(8), and two equivalent Sn(6) atoms. is represented by the CIF file [CIF]
data_Ca(SnO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.739
_cell_length_b   6.739
_cell_length_c   17.785
_cell_angle_alpha   85.742
_cell_angle_beta   85.742
_cell_angle_gamma   56.509
_symmetry_Int_Tables_number   1
_cell_volume   671.107
_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
  Ca  Ca0  1  0.835  0.835  0.959  1.0
  Ca  Ca1  1  0.167  0.167  0.667  1.0
  Ca  Ca2  1  0.337  0.337  0.832  1.0
  Ca  Ca3  1  0.832  0.832  0.334  1.0
  Ca  Ca4  1  0.000  0.000  0.500  1.0
  Ca  Ca5  1  0.663  0.663  0.168  1.0
  Sn  Sn6  1  0.838  0.335  0.833  1.0
  Sn  Sn7  1  0.503  0.503  0.623  1.0
  Sn  Sn8  1  0.499  0.499  0.991  1.0
  Sn  Sn9  1  0.335  0.838  0.833  1.0
  Sn  Sn10  1  0.500  0.000  0.500  1.0
  Sn  Sn11  1  0.168  0.168  0.288  1.0
  Sn  Sn12  1  0.000  0.500  0.500  1.0
  Sn  Sn13  1  0.162  0.664  0.166  1.0
  Sn  Sn14  1  0.833  0.833  0.710  1.0
  Sn  Sn15  1  0.664  0.162  0.166  1.0
  Sn  Sn16  1  0.497  0.497  0.376  1.0
  Sn  Sn17  1  0.164  0.164  0.047  1.0
  O  O18  1  0.673  0.201  0.907  1.0
  O  O19  1  0.523  0.523  0.774  1.0
  O  O20  1  0.201  0.673  0.907  1.0
  O  O21  1  0.657  0.657  0.898  1.0
  O  O22  1  0.344  0.855  0.575  1.0
  O  O23  1  0.023  0.023  0.769  1.0
  O  O24  1  0.184  0.184  0.440  1.0
  O  O25  1  0.479  0.992  0.758  1.0
  O  O26  1  0.855  0.344  0.575  1.0
  O  O27  1  0.153  0.153  0.892  1.0
  O  O28  1  0.311  0.311  0.564  1.0
  O  O29  1  0.992  0.479  0.758  1.0
  O  O30  1  0.006  0.521  0.242  1.0
  O  O31  1  0.688  0.688  0.436  1.0
  O  O32  1  0.144  0.656  0.425  1.0
  O  O33  1  0.521  0.006  0.242  1.0
  O  O34  1  0.844  0.844  0.099  1.0
  O  O35  1  0.816  0.816  0.560  1.0
  O  O36  1  0.969  0.969  0.230  1.0
  O  O37  1  0.656  0.144  0.425  1.0
  O  O38  1  0.346  0.346  0.105  1.0
  O  O39  1  0.825  0.313  0.100  1.0
  O  O40  1  0.478  0.478  0.226  1.0
  O  O41  1  0.313  0.825  0.100  1.0
[/CIF]
.
The compound described by Ca(SnO2)2 is Spinel-like structured and crystallizes in the monoclinic Cm space group. There are six inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(13), one O(3), and two equivalent O(1) atoms to form CaO4 tetrahedra that share  a cornercorner with one Ca(6)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent Sn(6)O6 octahedra, and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-66°. In the second Ca site, Ca(2) is bonded to one O(5), one O(9), two equivalent O(4), and two equivalent O(7) atoms to form distorted CaO6 octahedra that share corners with three equivalent Sn(2)O4 tetrahedra, corners with three equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Ca(3)O6 octahedra,  an edgeedge with one Ca(5)O6 octahedra, edges with two equivalent Sn(1)O6 octahedra, and edges with two equivalent Sn(4)O6 octahedra. In the third Ca site, Ca(3) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(7) atoms to form distorted CaO6 octahedra that share  a cornercorner with one Sn(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra, and edges with four equivalent Sn(1)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to one O(11), one O(15), two equivalent O(10), and two equivalent O(12) atoms to form distorted CaO6 octahedra that share corners with three equivalent Sn(5)O4 tetrahedra, corners with three equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Ca(5)O6 octahedra,  an edgeedge with one Ca(6)O6 octahedra, edges with two equivalent Sn(4)O6 octahedra, and edges with two equivalent Sn(6)O6 octahedra. In the fifth Ca site, Ca(5) is bonded to one O(14), one O(6), two equivalent O(12), and two equivalent O(4) atoms to form distorted CaO6 octahedra that share  a cornercorner with one Sn(5)O4 tetrahedra,  a cornercorner with one Sn(7)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra, corners with two equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, and edges with four equivalent Sn(4)O6 octahedra. In the sixth Ca site, Ca(6) is bonded to one O(13), one O(18), two equivalent O(10), and two equivalent O(17) atoms to form CaO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra,  a cornercorner with one Sn(8)O4 tetrahedra, corners with two equivalent Sn(5)O4 tetrahedra,  an edgeedge with one Ca(4)O6 octahedra, and edges with four equivalent Sn(6)O6 octahedra. There are nine inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form SnO6 octahedra that share  a cornercorner with one Sn(2)O4 tetrahedra, corners with two equivalent Ca(1)O4 tetrahedra, corners with two equivalent Sn(7)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra, edges with two equivalent Ca(3)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. In the second Sn site, Sn(2) is bonded to one O(2), one O(9), and two equivalent O(4) atoms to form distorted SnO4 tetrahedra that share  a cornercorner with one Ca(3)O6 octahedra, corners with two equivalent Ca(5)O6 octahedra, corners with two equivalent Sn(1)O6 octahedra, corners with three equivalent Ca(2)O6 octahedra, and corners with four equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-74°. In the third Sn site, Sn(3) is bonded in a 6-coordinate geometry to one O(16), one O(3), two equivalent O(1), and two equivalent O(17) atoms. In the fourth Sn site, Sn(4) is bonded to one O(11), one O(12), one O(14), one O(4), one O(6), and one O(9) atom to form SnO6 octahedra that share  a cornercorner with one Sn(5)O4 tetrahedra,  a cornercorner with one Sn(7)O4 tetrahedra, corners with two equivalent Sn(2)O4 tetrahedra, corners with two equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent Ca(5)O6 octahedra, and edges with two equivalent Sn(4)O6 octahedra. In the fifth Sn site, Sn(5) is bonded to one O(15), one O(6), and two equivalent O(10) atoms to form distorted SnO4 tetrahedra that share  a cornercorner with one Ca(5)O6 octahedra, corners with two equivalent Ca(6)O6 octahedra, corners with two equivalent Sn(4)O6 octahedra, corners with three equivalent Ca(4)O6 octahedra, and corners with four equivalent Sn(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-74°. In the sixth Sn site, Sn(6) is bonded to one O(10), one O(13), one O(15), one O(16), one O(17), and one O(18) atom to form SnO6 octahedra that share  a cornercorner with one Ca(1)O4 tetrahedra,  a cornercorner with one Sn(8)O4 tetrahedra, corners with two equivalent Sn(5)O4 tetrahedra,  an edgeedge with one Ca(4)O6 octahedra, edges with two equivalent Ca(6)O6 octahedra, and edges with two equivalent Sn(6)O6 octahedra. In the seventh Sn site, Sn(7) is bonded to one O(14), one O(5), and two equivalent O(7) atoms to form distorted SnO4 tetrahedra that share  a cornercorner with one Ca(5)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent Sn(4)O6 octahedra, corners with three equivalent Ca(2)O6 octahedra, and corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-73°. In the eighth Sn site, Sn(8) is bonded to one O(11), one O(18), and two equivalent O(12) atoms to form distorted SnO4 tetrahedra that share  a cornercorner with one Ca(6)O6 octahedra, corners with two equivalent Ca(5)O6 octahedra, corners with two equivalent Sn(6)O6 octahedra, corners with three equivalent Ca(4)O6 octahedra, and corners with four equivalent Sn(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-74°. In the ninth Sn site, Sn(9) is bonded in a 4-coordinate geometry to one O(16), one O(8), and two equivalent O(17) atoms. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(3), one Sn(1), and one Sn(3) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(1)Ca2Sn2 tetrahedra,  a cornercorner with one O(5)CaSn3 tetrahedra, corners with three equivalent O(7)Ca2Sn2 tetrahedra,  a cornercorner with one O(16)Sn4 trigonal pyramid, and  an edgeedge with one O(1)Ca2Sn2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(3), one Sn(2), and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Sn(3), and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded to one Ca(2), one Ca(5), one Sn(2), and one Sn(4) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(4)Ca2Sn2 tetrahedra,  a cornercorner with one O(11)CaSn3 tetrahedra,  a cornercorner with one O(5)CaSn3 tetrahedra,  a cornercorner with one O(9)CaSn3 tetrahedra, corners with two equivalent O(7)Ca2Sn2 tetrahedra, corners with three equivalent O(12)Ca2Sn2 tetrahedra,  an edgeedge with one O(4)Ca2Sn2 tetrahedra, and  an edgeedge with one O(9)CaSn3 tetrahedra. In the fifth O site, O(5) is bonded to one Ca(2), one Sn(7), and two equivalent Sn(1) atoms to form distorted OCaSn3 tetrahedra that share  a cornercorner with one O(9)CaSn3 tetrahedra, corners with two equivalent O(1)Ca2Sn2 tetrahedra, corners with two equivalent O(4)Ca2Sn2 tetrahedra, corners with two equivalent O(7)Ca2Sn2 tetrahedra, and edges with two equivalent O(7)Ca2Sn2 tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ca(5), one Sn(5), and two equivalent Sn(4) atoms. In the seventh O site, O(7) is bonded to one Ca(2), one Ca(3), one Sn(1), and one Sn(7) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(7)Ca2Sn2 tetrahedra,  a cornercorner with one O(5)CaSn3 tetrahedra,  a cornercorner with one O(9)CaSn3 tetrahedra, corners with two equivalent O(4)Ca2Sn2 tetrahedra, corners with three equivalent O(1)Ca2Sn2 tetrahedra,  an edgeedge with one O(7)Ca2Sn2 tetrahedra, and  an edgeedge with one O(5)CaSn3 tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ca(3), one Sn(9), and two equivalent Sn(1) atoms. In the ninth O site, O(9) is bonded to one Ca(2), one Sn(2), and two equivalent Sn(4) atoms to form distorted OCaSn3 tetrahedra that share  a cornercorner with one O(5)CaSn3 tetrahedra, corners with two equivalent O(12)Ca2Sn2 tetrahedra, corners with two equivalent O(4)Ca2Sn2 tetrahedra, corners with two equivalent O(7)Ca2Sn2 tetrahedra, corners with two equivalent O(11)CaSn3 tetrahedra, and edges with two equivalent O(4)Ca2Sn2 tetrahedra. In the tenth O site, O(10) is bonded to one Ca(4), one Ca(6), one Sn(5), and one Sn(6) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(10)Ca2Sn2 tetrahedra,  a cornercorner with one O(11)CaSn3 tetrahedra,  a cornercorner with one O(15)CaSn3 tetrahedra, corners with two equivalent O(12)Ca2Sn2 tetrahedra,  a cornercorner with one O(16)Sn4 trigonal pyramid,  an edgeedge with one O(10)Ca2Sn2 tetrahedra, and  an edgeedge with one O(15)CaSn3 tetrahedra. In the eleventh O site, O(11) is bonded to one Ca(4), one Sn(8), and two equivalent Sn(4) atoms to form distorted OCaSn3 tetrahedra that share  a cornercorner with one O(15)CaSn3 tetrahedra, corners with two equivalent O(10)Ca2Sn2 tetrahedra, corners with two equivalent O(12)Ca2Sn2 tetrahedra, corners with two equivalent O(4)Ca2Sn2 tetrahedra, corners with two equivalent O(9)CaSn3 tetrahedra, and edges with two equivalent O(12)Ca2Sn2 tetrahedra. In the twelfth O site, O(12) is bonded to one Ca(4), one Ca(5), one Sn(4), and one Sn(8) atom to form distorted OCa2Sn2 tetrahedra that share  a cornercorner with one O(12)Ca2Sn2 tetrahedra,  a cornercorner with one O(11)CaSn3 tetrahedra,  a cornercorner with one O(15)CaSn3 tetrahedra,  a cornercorner with one O(9)CaSn3 tetrahedra, corners with two equivalent O(10)Ca2Sn2 tetrahedra, corners with three equivalent O(4)Ca2Sn2 tetrahedra,  an edgeedge with one O(12)Ca2Sn2 tetrahedra, and  an edgeedge with one O(11)CaSn3 tetrahedra. In the thirteenth O site, O(13) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Ca(6), and two equivalent Sn(6) atoms. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ca(5), one Sn(7), and two equivalent Sn(4) atoms. In the fifteenth O site, O(15) is bonded to one Ca(4), one Sn(5), and two equivalent Sn(6) atoms to form distorted OCaSn3 tetrahedra that share  a cornercorner with one O(11)CaSn3 tetrahedra, corners with two equivalent O(10)Ca2Sn2 tetrahedra, corners with two equivalent O(12)Ca2Sn2 tetrahedra, corners with two equivalent O(16)Sn4 trigonal pyramids, and edges with two equivalent O(10)Ca2Sn2 tetrahedra. In the sixteenth O site, O(16) is bonded to one Sn(3), one Sn(9), and two equivalent Sn(6) atoms to form distorted OSn4 trigonal pyramids that share corners with two equivalent O(1)Ca2Sn2 tetrahedra, corners with two equivalent O(10)Ca2Sn2 tetrahedra, and corners with two equivalent O(15)CaSn3 tetrahedra. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Ca(6), one Sn(3), one Sn(6), and one Sn(9) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Ca(6), one Sn(8), and two equivalent Sn(6) atoms. is represented by the CIF file [CIF]
data_Ca(SnO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.739
_cell_length_b   6.739
_cell_length_c   17.785
_cell_angle_alpha   85.742
_cell_angle_beta   85.742
_cell_angle_gamma   56.509
_symmetry_Int_Tables_number   1
_cell_volume   671.107
_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
  Ca  Ca0  1  0.835  0.835  0.959  1.0
  Ca  Ca1  1  0.167  0.167  0.667  1.0
  Ca  Ca2  1  0.337  0.337  0.832  1.0
  Ca  Ca3  1  0.832  0.832  0.334  1.0
  Ca  Ca4  1  0.000  0.000  0.500  1.0
  Ca  Ca5  1  0.663  0.663  0.168  1.0
  Sn  Sn6  1  0.838  0.335  0.833  1.0
  Sn  Sn7  1  0.503  0.503  0.623  1.0
  Sn  Sn8  1  0.499  0.499  0.991  1.0
  Sn  Sn9  1  0.335  0.838  0.833  1.0
  Sn  Sn10  1  0.500  0.000  0.500  1.0
  Sn  Sn11  1  0.168  0.168  0.288  1.0
  Sn  Sn12  1  0.000  0.500  0.500  1.0
  Sn  Sn13  1  0.162  0.664  0.166  1.0
  Sn  Sn14  1  0.833  0.833  0.710  1.0
  Sn  Sn15  1  0.664  0.162  0.166  1.0
  Sn  Sn16  1  0.497  0.497  0.376  1.0
  Sn  Sn17  1  0.164  0.164  0.047  1.0
  O  O18  1  0.673  0.201  0.907  1.0
  O  O19  1  0.523  0.523  0.774  1.0
  O  O20  1  0.201  0.673  0.907  1.0
  O  O21  1  0.657  0.657  0.898  1.0
  O  O22  1  0.344  0.855  0.575  1.0
  O  O23  1  0.023  0.023  0.769  1.0
  O  O24  1  0.184  0.184  0.440  1.0
  O  O25  1  0.479  0.992  0.758  1.0
  O  O26  1  0.855  0.344  0.575  1.0
  O  O27  1  0.153  0.153  0.892  1.0
  O  O28  1  0.311  0.311  0.564  1.0
  O  O29  1  0.992  0.479  0.758  1.0
  O  O30  1  0.006  0.521  0.242  1.0
  O  O31  1  0.688  0.688  0.436  1.0
  O  O32  1  0.144  0.656  0.425  1.0
  O  O33  1  0.521  0.006  0.242  1.0
  O  O34  1  0.844  0.844  0.099  1.0
  O  O35  1  0.816  0.816  0.560  1.0
  O  O36  1  0.969  0.969  0.230  1.0
  O  O37  1  0.656  0.144  0.425  1.0
  O  O38  1  0.346  0.346  0.105  1.0
  O  O39  1  0.825  0.313  0.100  1.0
  O  O40  1  0.478  0.478  0.226  1.0
  O  O41  1  0.313  0.825  0.100  1.0
[/CIF]
.