The structure described by Ca3Fe6(SnO8)2 crystallizes in the monoclinic Pm space group. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(13), one O(14), two equivalent O(11), two equivalent O(3), and two equivalent O(7) atoms. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(13), one O(14), two equivalent O(12), two equivalent O(4), and two equivalent O(8) atoms. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(15), one O(16), two equivalent O(1), two equivalent O(5), and two equivalent O(9) atoms. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(13), one O(5), two equivalent O(12), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 48-58°. In the second Fe site, Fe(2) is bonded to one O(14), one O(6), two equivalent O(11), and two equivalent O(8) atoms to form a mixture of corner and edge-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 51-63°. In the third Fe site, Fe(3) is bonded to one O(15), one O(7), two equivalent O(10), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra, corners with two equivalent Sn(2)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-55°. In the fourth Fe site, Fe(4) is bonded to one O(16), one O(8), two equivalent O(6), and two equivalent O(9) atoms to form FeO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra, corners with two equivalent Sn(2)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-59°. In the fifth Fe site, Fe(5) is bonded to one O(11), one O(4), two equivalent O(13), and two equivalent O(2) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-63°. In the sixth Fe site, Fe(6) is bonded to one O(12), one O(3), two equivalent O(1), and two equivalent O(14) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Fe(6)O6 octahedra, and edges with two equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-58°. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), one O(9), two equivalent O(15), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-59°. In the second Sn site, Sn(2) is bonded to one O(1), one O(10), two equivalent O(16), and two equivalent O(3) atoms to form SnO6 octahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, edges with two equivalent Fe(6)O6 octahedra, and edges with two equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-55°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(3), two equivalent Fe(6), and one Sn(2) atom to form OCa2Fe2Sn square pyramids that share corners with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(5)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(15)CaFeSn2 trigonal pyramids, edges with two equivalent O(1)Ca2Fe2Sn square pyramids, edges with two equivalent O(3)Ca2FeSn2 square pyramids,  an edgeedge with one O(9)Ca2Fe2Sn trigonal bipyramid,  an edgeedge with one O(14)Ca2Fe3 trigonal bipyramid,  an edgeedge with one O(5)Ca2Fe3 trigonal bipyramid, and edges with two equivalent O(16)CaFeSn2 trigonal pyramids. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to two equivalent Fe(5) and one Sn(1) atom. In the third O site, O(3) is bonded to two equivalent Ca(1), one Fe(6), and two equivalent Sn(2) atoms to form distorted OCa2FeSn2 square pyramids that share corners with two equivalent O(11)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(13)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(7)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(16)CaFeSn2 trigonal pyramids, edges with two equivalent O(1)Ca2Fe2Sn square pyramids, edges with two equivalent O(3)Ca2FeSn2 square pyramids,  an edgeedge with one O(11)Ca2Fe3 trigonal bipyramid,  an edgeedge with one O(7)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(14)Ca2Fe3 trigonal bipyramids, and  an edgeedge with one O(16)CaFeSn2 trigonal pyramid. In the fourth O site, O(4) is bonded to two equivalent Ca(2), one Fe(5), and two equivalent Sn(1) atoms to form OCa2FeSn2 square pyramids that share  a cornercorner with one O(11)Ca2Fe3 trigonal bipyramid, corners with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(8)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(15)CaFeSn2 trigonal pyramids, edges with two equivalent O(4)Ca2FeSn2 square pyramids,  an edgeedge with one O(8)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(13)Ca2Fe3 trigonal bipyramids, and  an edgeedge with one O(15)CaFeSn2 trigonal pyramid. In the fifth O site, O(5) is bonded to two equivalent Ca(3), one Fe(1), and two equivalent Fe(3) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(1)Ca2Fe2Sn square pyramids,  a cornercorner with one O(13)Ca2Fe3 trigonal bipyramid, corners with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, corners with two equivalent O(16)CaFeSn2 trigonal pyramids,  an edgeedge with one O(1)Ca2Fe2Sn square pyramid,  an edgeedge with one O(9)Ca2Fe2Sn trigonal bipyramid, edges with two equivalent O(5)Ca2Fe3 trigonal bipyramids, edges with two equivalent O(7)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(15)CaFeSn2 trigonal pyramids. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Fe(2) and two equivalent Fe(4) atoms. In the seventh O site, O(7) is bonded to two equivalent Ca(1), one Fe(3), and two equivalent Fe(1) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(3)Ca2FeSn2 square pyramids, corners with two equivalent O(11)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids,  a cornercorner with one O(15)CaFeSn2 trigonal pyramid,  an edgeedge with one O(3)Ca2FeSn2 square pyramid,  an edgeedge with one O(11)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(13)Ca2Fe3 trigonal bipyramids, edges with two equivalent O(5)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(7)Ca2Fe3 trigonal bipyramids. In the eighth O site, O(8) is bonded to two equivalent Ca(2), one Fe(4), and two equivalent Fe(2) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(4)Ca2FeSn2 square pyramids, corners with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, corners with two equivalent O(11)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(13)Ca2Fe3 trigonal bipyramids,  a cornercorner with one O(16)CaFeSn2 trigonal pyramid,  an edgeedge with one O(4)Ca2FeSn2 square pyramid,  an edgeedge with one O(11)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(14)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(8)Ca2Fe3 trigonal bipyramids. In the ninth O site, O(9) is bonded to two equivalent Ca(3), two equivalent Fe(4), and one Sn(1) atom to form distorted OCa2Fe2Sn trigonal bipyramids that share corners with two equivalent O(1)Ca2Fe2Sn square pyramids, corners with two equivalent O(4)Ca2FeSn2 square pyramids, corners with two equivalent O(5)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(8)Ca2Fe3 trigonal bipyramids,  an edgeedge with one O(1)Ca2Fe2Sn square pyramid,  an edgeedge with one O(5)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, edges with two equivalent O(15)CaFeSn2 trigonal pyramids, and edges with two equivalent O(16)CaFeSn2 trigonal pyramids. In the tenth O site, O(10) is bonded in a trigonal planar geometry to two equivalent Fe(3) and one Sn(2) atom. In the eleventh O site, O(11) is bonded to two equivalent Ca(1), one Fe(5), and two equivalent Fe(2) atoms to form distorted OCa2Fe3 trigonal bipyramids that share  a cornercorner with one O(4)Ca2FeSn2 square pyramid, corners with two equivalent O(3)Ca2FeSn2 square pyramids, corners with two equivalent O(7)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(8)Ca2Fe3 trigonal bipyramids,  an edgeedge with one O(3)Ca2FeSn2 square pyramid,  an edgeedge with one O(7)Ca2Fe3 trigonal bipyramid,  an edgeedge with one O(8)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(11)Ca2Fe3 trigonal bipyramids, edges with two equivalent O(13)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(14)Ca2Fe3 trigonal bipyramids. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to two equivalent Ca(2), one Fe(6), and two equivalent Fe(1) atoms. In the thirteenth O site, O(13) is bonded to one Ca(1), one Ca(2), one Fe(1), and two equivalent Fe(5) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(3)Ca2FeSn2 square pyramids,  a cornercorner with one O(5)Ca2Fe3 trigonal bipyramid, corners with two equivalent O(13)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(8)Ca2Fe3 trigonal bipyramids, edges with two equivalent O(4)Ca2FeSn2 square pyramids, edges with two equivalent O(11)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(7)Ca2Fe3 trigonal bipyramids. In the fourteenth O site, O(14) is bonded to one Ca(1), one Ca(2), one Fe(2), and two equivalent Fe(6) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(1)Ca2Fe2Sn square pyramids, corners with two equivalent O(4)Ca2FeSn2 square pyramids, corners with two equivalent O(13)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(7)Ca2Fe3 trigonal bipyramids,  an edgeedge with one O(1)Ca2Fe2Sn square pyramid, edges with two equivalent O(3)Ca2FeSn2 square pyramids, edges with two equivalent O(11)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(8)Ca2Fe3 trigonal bipyramids. In the fifteenth O site, O(15) is bonded to one Ca(3), one Fe(3), and two equivalent Sn(1) atoms to form distorted OCaFeSn2 trigonal pyramids that share corners with two equivalent O(1)Ca2Fe2Sn square pyramids, corners with two equivalent O(4)Ca2FeSn2 square pyramids,  a cornercorner with one O(7)Ca2Fe3 trigonal bipyramid,  a cornercorner with one O(16)CaFeSn2 trigonal pyramid, corners with two equivalent O(15)CaFeSn2 trigonal pyramids,  an edgeedge with one O(4)Ca2FeSn2 square pyramid, edges with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, and edges with two equivalent O(5)Ca2Fe3 trigonal bipyramids. In the sixteenth O site, O(16) is bonded to one Ca(3), one Fe(4), and two equivalent Sn(2) atoms to form distorted OCaFeSn2 trigonal pyramids that share corners with two equivalent O(3)Ca2FeSn2 square pyramids,  a cornercorner with one O(8)Ca2Fe3 trigonal bipyramid, corners with two equivalent O(5)Ca2Fe3 trigonal bipyramids,  a cornercorner with one O(15)CaFeSn2 trigonal pyramid, corners with two equivalent O(16)CaFeSn2 trigonal pyramids,  an edgeedge with one O(3)Ca2FeSn2 square pyramid, edges with two equivalent O(1)Ca2Fe2Sn square pyramids, and edges with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca3Fe6(SnO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.108
_cell_length_b   9.358
_cell_length_c   10.958
_cell_angle_alpha   89.524
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   318.672
_cell_formula_units_Z   1
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  0.250  0.255  0.839  1.0
  Ca  Ca1  1  0.250  0.756  0.661  1.0
  Ca  Ca2  1  0.750  0.743  0.154  1.0
  Fe  Fe3  1  0.250  0.938  0.887  1.0
  Fe  Fe4  1  0.250  0.436  0.611  1.0
  Fe  Fe5  1  0.750  0.066  0.108  1.0
  Fe  Fe6  1  0.750  0.551  0.396  1.0
  Fe  Fe7  1  0.750  0.093  0.603  1.0
  Fe  Fe8  1  0.750  0.587  0.892  1.0
  Sn  Sn9  1  0.250  0.922  0.395  1.0
  Sn  Sn10  1  0.250  0.411  0.110  1.0
  O  O11  1  0.250  0.617  0.026  1.0
  O  O12  1  0.250  0.111  0.487  1.0
  O  O13  1  0.750  0.383  0.975  1.0
  O  O14  1  0.750  0.875  0.525  1.0
  O  O15  1  0.250  0.916  0.070  1.0
  O  O16  1  0.250  0.430  0.434  1.0
  O  O17  1  0.750  0.082  0.923  1.0
  O  O18  1  0.750  0.584  0.580  1.0
  O  O19  1  0.250  0.706  0.334  1.0
  O  O20  1  0.250  0.197  0.138  1.0
  O  O21  1  0.750  0.297  0.671  1.0
  O  O22  1  0.750  0.795  0.837  1.0
  O  O23  1  0.250  0.026  0.717  1.0
  O  O24  1  0.250  0.529  0.788  1.0
  O  O25  1  0.750  0.962  0.275  1.0
  O  O26  1  0.750  0.483  0.215  1.0
[/CIF]
.
The structure described by Ca3Fe6(SnO8)2 crystallizes in the monoclinic Pm space group. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(13), one O(14), two equivalent O(11), two equivalent O(3), and two equivalent O(7) atoms. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(13), one O(14), two equivalent O(12), two equivalent O(4), and two equivalent O(8) atoms. In the third Ca site, Ca(3) is bonded in a 8-coordinate geometry to one O(15), one O(16), two equivalent O(1), two equivalent O(5), and two equivalent O(9) atoms. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(13), one O(5), two equivalent O(12), and two equivalent O(7) atoms to form a mixture of corner and edge-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 48-58°. In the second Fe site, Fe(2) is bonded to one O(14), one O(6), two equivalent O(11), and two equivalent O(8) atoms to form a mixture of corner and edge-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 51-63°. In the third Fe site, Fe(3) is bonded to one O(15), one O(7), two equivalent O(10), and two equivalent O(5) atoms to form FeO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra, corners with two equivalent Sn(2)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-55°. In the fourth Fe site, Fe(4) is bonded to one O(16), one O(8), two equivalent O(6), and two equivalent O(9) atoms to form FeO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra, corners with two equivalent Sn(2)O6 octahedra, edges with two equivalent Fe(2)O6 octahedra, and edges with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-59°. In the fifth Fe site, Fe(5) is bonded to one O(11), one O(4), two equivalent O(13), and two equivalent O(2) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-63°. In the sixth Fe site, Fe(6) is bonded to one O(12), one O(3), two equivalent O(1), and two equivalent O(14) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, edges with two equivalent Fe(6)O6 octahedra, and edges with two equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-58°. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), one O(9), two equivalent O(15), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and edges with two equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-59°. In the second Sn site, Sn(2) is bonded to one O(1), one O(10), two equivalent O(16), and two equivalent O(3) atoms to form SnO6 octahedra that share corners with two equivalent Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, edges with two equivalent Fe(6)O6 octahedra, and edges with two equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-55°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(3), two equivalent Fe(6), and one Sn(2) atom to form OCa2Fe2Sn square pyramids that share corners with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(5)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(15)CaFeSn2 trigonal pyramids, edges with two equivalent O(1)Ca2Fe2Sn square pyramids, edges with two equivalent O(3)Ca2FeSn2 square pyramids,  an edgeedge with one O(9)Ca2Fe2Sn trigonal bipyramid,  an edgeedge with one O(14)Ca2Fe3 trigonal bipyramid,  an edgeedge with one O(5)Ca2Fe3 trigonal bipyramid, and edges with two equivalent O(16)CaFeSn2 trigonal pyramids. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to two equivalent Fe(5) and one Sn(1) atom. In the third O site, O(3) is bonded to two equivalent Ca(1), one Fe(6), and two equivalent Sn(2) atoms to form distorted OCa2FeSn2 square pyramids that share corners with two equivalent O(11)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(13)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(7)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(16)CaFeSn2 trigonal pyramids, edges with two equivalent O(1)Ca2Fe2Sn square pyramids, edges with two equivalent O(3)Ca2FeSn2 square pyramids,  an edgeedge with one O(11)Ca2Fe3 trigonal bipyramid,  an edgeedge with one O(7)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(14)Ca2Fe3 trigonal bipyramids, and  an edgeedge with one O(16)CaFeSn2 trigonal pyramid. In the fourth O site, O(4) is bonded to two equivalent Ca(2), one Fe(5), and two equivalent Sn(1) atoms to form OCa2FeSn2 square pyramids that share  a cornercorner with one O(11)Ca2Fe3 trigonal bipyramid, corners with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(8)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(15)CaFeSn2 trigonal pyramids, edges with two equivalent O(4)Ca2FeSn2 square pyramids,  an edgeedge with one O(8)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(13)Ca2Fe3 trigonal bipyramids, and  an edgeedge with one O(15)CaFeSn2 trigonal pyramid. In the fifth O site, O(5) is bonded to two equivalent Ca(3), one Fe(1), and two equivalent Fe(3) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(1)Ca2Fe2Sn square pyramids,  a cornercorner with one O(13)Ca2Fe3 trigonal bipyramid, corners with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, corners with two equivalent O(16)CaFeSn2 trigonal pyramids,  an edgeedge with one O(1)Ca2Fe2Sn square pyramid,  an edgeedge with one O(9)Ca2Fe2Sn trigonal bipyramid, edges with two equivalent O(5)Ca2Fe3 trigonal bipyramids, edges with two equivalent O(7)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(15)CaFeSn2 trigonal pyramids. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Fe(2) and two equivalent Fe(4) atoms. In the seventh O site, O(7) is bonded to two equivalent Ca(1), one Fe(3), and two equivalent Fe(1) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(3)Ca2FeSn2 square pyramids, corners with two equivalent O(11)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids,  a cornercorner with one O(15)CaFeSn2 trigonal pyramid,  an edgeedge with one O(3)Ca2FeSn2 square pyramid,  an edgeedge with one O(11)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(13)Ca2Fe3 trigonal bipyramids, edges with two equivalent O(5)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(7)Ca2Fe3 trigonal bipyramids. In the eighth O site, O(8) is bonded to two equivalent Ca(2), one Fe(4), and two equivalent Fe(2) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(4)Ca2FeSn2 square pyramids, corners with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, corners with two equivalent O(11)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(13)Ca2Fe3 trigonal bipyramids,  a cornercorner with one O(16)CaFeSn2 trigonal pyramid,  an edgeedge with one O(4)Ca2FeSn2 square pyramid,  an edgeedge with one O(11)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(14)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(8)Ca2Fe3 trigonal bipyramids. In the ninth O site, O(9) is bonded to two equivalent Ca(3), two equivalent Fe(4), and one Sn(1) atom to form distorted OCa2Fe2Sn trigonal bipyramids that share corners with two equivalent O(1)Ca2Fe2Sn square pyramids, corners with two equivalent O(4)Ca2FeSn2 square pyramids, corners with two equivalent O(5)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(8)Ca2Fe3 trigonal bipyramids,  an edgeedge with one O(1)Ca2Fe2Sn square pyramid,  an edgeedge with one O(5)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, edges with two equivalent O(15)CaFeSn2 trigonal pyramids, and edges with two equivalent O(16)CaFeSn2 trigonal pyramids. In the tenth O site, O(10) is bonded in a trigonal planar geometry to two equivalent Fe(3) and one Sn(2) atom. In the eleventh O site, O(11) is bonded to two equivalent Ca(1), one Fe(5), and two equivalent Fe(2) atoms to form distorted OCa2Fe3 trigonal bipyramids that share  a cornercorner with one O(4)Ca2FeSn2 square pyramid, corners with two equivalent O(3)Ca2FeSn2 square pyramids, corners with two equivalent O(7)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(8)Ca2Fe3 trigonal bipyramids,  an edgeedge with one O(3)Ca2FeSn2 square pyramid,  an edgeedge with one O(7)Ca2Fe3 trigonal bipyramid,  an edgeedge with one O(8)Ca2Fe3 trigonal bipyramid, edges with two equivalent O(11)Ca2Fe3 trigonal bipyramids, edges with two equivalent O(13)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(14)Ca2Fe3 trigonal bipyramids. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to two equivalent Ca(2), one Fe(6), and two equivalent Fe(1) atoms. In the thirteenth O site, O(13) is bonded to one Ca(1), one Ca(2), one Fe(1), and two equivalent Fe(5) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(3)Ca2FeSn2 square pyramids,  a cornercorner with one O(5)Ca2Fe3 trigonal bipyramid, corners with two equivalent O(13)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(8)Ca2Fe3 trigonal bipyramids, edges with two equivalent O(4)Ca2FeSn2 square pyramids, edges with two equivalent O(11)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(7)Ca2Fe3 trigonal bipyramids. In the fourteenth O site, O(14) is bonded to one Ca(1), one Ca(2), one Fe(2), and two equivalent Fe(6) atoms to form distorted OCa2Fe3 trigonal bipyramids that share corners with two equivalent O(1)Ca2Fe2Sn square pyramids, corners with two equivalent O(4)Ca2FeSn2 square pyramids, corners with two equivalent O(13)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(14)Ca2Fe3 trigonal bipyramids, corners with two equivalent O(7)Ca2Fe3 trigonal bipyramids,  an edgeedge with one O(1)Ca2Fe2Sn square pyramid, edges with two equivalent O(3)Ca2FeSn2 square pyramids, edges with two equivalent O(11)Ca2Fe3 trigonal bipyramids, and edges with two equivalent O(8)Ca2Fe3 trigonal bipyramids. In the fifteenth O site, O(15) is bonded to one Ca(3), one Fe(3), and two equivalent Sn(1) atoms to form distorted OCaFeSn2 trigonal pyramids that share corners with two equivalent O(1)Ca2Fe2Sn square pyramids, corners with two equivalent O(4)Ca2FeSn2 square pyramids,  a cornercorner with one O(7)Ca2Fe3 trigonal bipyramid,  a cornercorner with one O(16)CaFeSn2 trigonal pyramid, corners with two equivalent O(15)CaFeSn2 trigonal pyramids,  an edgeedge with one O(4)Ca2FeSn2 square pyramid, edges with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids, and edges with two equivalent O(5)Ca2Fe3 trigonal bipyramids. In the sixteenth O site, O(16) is bonded to one Ca(3), one Fe(4), and two equivalent Sn(2) atoms to form distorted OCaFeSn2 trigonal pyramids that share corners with two equivalent O(3)Ca2FeSn2 square pyramids,  a cornercorner with one O(8)Ca2Fe3 trigonal bipyramid, corners with two equivalent O(5)Ca2Fe3 trigonal bipyramids,  a cornercorner with one O(15)CaFeSn2 trigonal pyramid, corners with two equivalent O(16)CaFeSn2 trigonal pyramids,  an edgeedge with one O(3)Ca2FeSn2 square pyramid, edges with two equivalent O(1)Ca2Fe2Sn square pyramids, and edges with two equivalent O(9)Ca2Fe2Sn trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca3Fe6(SnO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.108
_cell_length_b   9.358
_cell_length_c   10.958
_cell_angle_alpha   89.524
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   318.672
_cell_formula_units_Z   1
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  0.250  0.255  0.839  1.0
  Ca  Ca1  1  0.250  0.756  0.661  1.0
  Ca  Ca2  1  0.750  0.743  0.154  1.0
  Fe  Fe3  1  0.250  0.938  0.887  1.0
  Fe  Fe4  1  0.250  0.436  0.611  1.0
  Fe  Fe5  1  0.750  0.066  0.108  1.0
  Fe  Fe6  1  0.750  0.551  0.396  1.0
  Fe  Fe7  1  0.750  0.093  0.603  1.0
  Fe  Fe8  1  0.750  0.587  0.892  1.0
  Sn  Sn9  1  0.250  0.922  0.395  1.0
  Sn  Sn10  1  0.250  0.411  0.110  1.0
  O  O11  1  0.250  0.617  0.026  1.0
  O  O12  1  0.250  0.111  0.487  1.0
  O  O13  1  0.750  0.383  0.975  1.0
  O  O14  1  0.750  0.875  0.525  1.0
  O  O15  1  0.250  0.916  0.070  1.0
  O  O16  1  0.250  0.430  0.434  1.0
  O  O17  1  0.750  0.082  0.923  1.0
  O  O18  1  0.750  0.584  0.580  1.0
  O  O19  1  0.250  0.706  0.334  1.0
  O  O20  1  0.250  0.197  0.138  1.0
  O  O21  1  0.750  0.297  0.671  1.0
  O  O22  1  0.750  0.795  0.837  1.0
  O  O23  1  0.250  0.026  0.717  1.0
  O  O24  1  0.250  0.529  0.788  1.0
  O  O25  1  0.750  0.962  0.275  1.0
  O  O26  1  0.750  0.483  0.215  1.0
[/CIF]
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