The material described by Ca2Y3Si3O13 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 9-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the second Ca site, Ca(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(10), one O(11), one O(12), one O(13), one O(2), one O(4), and one O(9) atom to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Y(2)O7 pentagonal bipyramids, corners with three equivalent Y(3)O7 pentagonal bipyramids,  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Si(3)O4 tetrahedra, and  an edgeedge with one Si(2)O4 tetrahedra. In the second Y site, Y(2) is bonded to one O(10), one O(13), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Y(1)O7 pentagonal bipyramids, corners with three equivalent Y(3)O7 pentagonal bipyramids,  a cornercorner with one Si(3)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. In the third Y site, Y(3) is bonded to one O(1), one O(11), one O(12), one O(13), one O(3), one O(7), and one O(8) atom to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Y(1)O7 pentagonal bipyramids, corners with three equivalent Y(2)O7 pentagonal bipyramids,  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Si(3)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Y(1)O7 pentagonal bipyramid, corners with three equivalent Y(3)O7 pentagonal bipyramids, and  an edgeedge with one Y(2)O7 pentagonal bipyramid. In the second Si site, Si(2) is bonded to one O(1), one O(10), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Y(3)O7 pentagonal bipyramid, corners with three equivalent Y(2)O7 pentagonal bipyramids, and  an edgeedge with one Y(1)O7 pentagonal bipyramid. In the third Si site, Si(3) is bonded to one O(11), one O(12), one O(2), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Y(2)O7 pentagonal bipyramid, corners with three equivalent Y(1)O7 pentagonal bipyramids, and  an edgeedge with one Y(3)O7 pentagonal bipyramid. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(2), one Y(3), and one Si(2) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Y(1), and one Si(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Y(3), and one Si(1) atom. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), one Y(1), and one Si(1) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Y(2), and one Si(2) atom. In the sixth O site, O(6) is bonded to one Ca(1), one Ca(2), one Y(2), and one Si(3) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Ca(1), one Y(2), one Y(3), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ca(2), one Y(2), one Y(3), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one Ca(1), one Y(1), one Y(2), and one Si(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(2), one Y(1), one Y(2), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 1-coordinate geometry to one Ca(1), one Y(1), one Y(3), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Ca(2), one Y(1), one Y(3), and one Si(3) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Y(1), one Y(2), and one Y(3) atom. is represented by the CIF card [CIF]
data_Ca2Y3Si3O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.914
_cell_length_b   9.469
_cell_length_c   9.469
_cell_angle_alpha   60.057
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   537.147
_cell_formula_units_Z   2
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  0.983  0.331  0.336  1.0
  Ca  Ca1  1  0.483  0.669  0.664  1.0
  Ca  Ca2  1  0.487  0.331  0.334  1.0
  Ca  Ca3  1  0.987  0.669  0.666  1.0
  Y  Y4  1  0.233  0.993  0.762  1.0
  Y  Y5  1  0.733  0.007  0.238  1.0
  Y  Y6  1  0.233  0.758  0.246  1.0
  Y  Y7  1  0.733  0.242  0.754  1.0
  Y  Y8  1  0.733  0.754  0.006  1.0
  Y  Y9  1  0.233  0.246  0.994  1.0
  Si  Si10  1  0.234  0.608  0.023  1.0
  Si  Si11  1  0.734  0.392  0.977  1.0
  Si  Si12  1  0.234  0.367  0.610  1.0
  Si  Si13  1  0.734  0.633  0.390  1.0
  Si  Si14  1  0.733  0.977  0.632  1.0
  Si  Si15  1  0.233  0.023  0.368  1.0
  O  O16  1  0.733  0.525  0.299  1.0
  O  O17  1  0.233  0.475  0.701  1.0
  O  O18  1  0.236  0.114  0.476  1.0
  O  O19  1  0.736  0.886  0.524  1.0
  O  O20  1  0.237  0.408  0.117  1.0
  O  O21  1  0.737  0.592  0.883  1.0
  O  O22  1  0.234  0.699  0.825  1.0
  O  O23  1  0.734  0.301  0.175  1.0
  O  O24  1  0.237  0.474  0.411  1.0
  O  O25  1  0.737  0.526  0.589  1.0
  O  O26  1  0.733  0.176  0.526  1.0
  O  O27  1  0.233  0.824  0.474  1.0
  O  O28  1  0.048  0.667  0.090  1.0
  O  O29  1  0.548  0.333  0.910  1.0
  O  O30  1  0.419  0.672  0.087  1.0
  O  O31  1  0.919  0.328  0.913  1.0
  O  O32  1  0.047  0.242  0.668  1.0
  O  O33  1  0.547  0.758  0.332  1.0
  O  O34  1  0.418  0.239  0.675  1.0
  O  O35  1  0.918  0.761  0.325  1.0
  O  O36  1  0.547  0.910  0.757  1.0
  O  O37  1  0.047  0.090  0.243  1.0
  O  O38  1  0.919  0.912  0.759  1.0
  O  O39  1  0.419  0.088  0.241  1.0
  O  O40  1  0.230  0.999  0.002  1.0
  O  O41  1  0.730  0.001  0.998  1.0
[/CIF]
.
The material described by Ca2Y3Si3O13 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 9-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the second Ca site, Ca(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(10), one O(11), one O(12), one O(13), one O(2), one O(4), and one O(9) atom to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Y(2)O7 pentagonal bipyramids, corners with three equivalent Y(3)O7 pentagonal bipyramids,  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Si(3)O4 tetrahedra, and  an edgeedge with one Si(2)O4 tetrahedra. In the second Y site, Y(2) is bonded to one O(10), one O(13), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Y(1)O7 pentagonal bipyramids, corners with three equivalent Y(3)O7 pentagonal bipyramids,  a cornercorner with one Si(3)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. In the third Y site, Y(3) is bonded to one O(1), one O(11), one O(12), one O(13), one O(3), one O(7), and one O(8) atom to form distorted YO7 pentagonal bipyramids that share corners with three equivalent Y(1)O7 pentagonal bipyramids, corners with three equivalent Y(2)O7 pentagonal bipyramids,  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Si(3)O4 tetrahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Y(1)O7 pentagonal bipyramid, corners with three equivalent Y(3)O7 pentagonal bipyramids, and  an edgeedge with one Y(2)O7 pentagonal bipyramid. In the second Si site, Si(2) is bonded to one O(1), one O(10), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Y(3)O7 pentagonal bipyramid, corners with three equivalent Y(2)O7 pentagonal bipyramids, and  an edgeedge with one Y(1)O7 pentagonal bipyramid. In the third Si site, Si(3) is bonded to one O(11), one O(12), one O(2), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Y(2)O7 pentagonal bipyramid, corners with three equivalent Y(1)O7 pentagonal bipyramids, and  an edgeedge with one Y(3)O7 pentagonal bipyramid. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded to one Ca(1), one Ca(2), one Y(3), and one Si(2) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Y(1), and one Si(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Y(3), and one Si(1) atom. In the fourth O site, O(4) is bonded to one Ca(1), one Ca(2), one Y(1), and one Si(1) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Y(2), and one Si(2) atom. In the sixth O site, O(6) is bonded to one Ca(1), one Ca(2), one Y(2), and one Si(3) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Ca(1), one Y(2), one Y(3), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ca(2), one Y(2), one Y(3), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 1-coordinate geometry to one Ca(1), one Y(1), one Y(2), and one Si(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Ca(2), one Y(1), one Y(2), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 1-coordinate geometry to one Ca(1), one Y(1), one Y(3), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a 1-coordinate geometry to one Ca(2), one Y(1), one Y(3), and one Si(3) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Y(1), one Y(2), and one Y(3) atom. is represented by the CIF card [CIF]
data_Ca2Y3Si3O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.914
_cell_length_b   9.469
_cell_length_c   9.469
_cell_angle_alpha   60.057
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   537.147
_cell_formula_units_Z   2
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  0.983  0.331  0.336  1.0
  Ca  Ca1  1  0.483  0.669  0.664  1.0
  Ca  Ca2  1  0.487  0.331  0.334  1.0
  Ca  Ca3  1  0.987  0.669  0.666  1.0
  Y  Y4  1  0.233  0.993  0.762  1.0
  Y  Y5  1  0.733  0.007  0.238  1.0
  Y  Y6  1  0.233  0.758  0.246  1.0
  Y  Y7  1  0.733  0.242  0.754  1.0
  Y  Y8  1  0.733  0.754  0.006  1.0
  Y  Y9  1  0.233  0.246  0.994  1.0
  Si  Si10  1  0.234  0.608  0.023  1.0
  Si  Si11  1  0.734  0.392  0.977  1.0
  Si  Si12  1  0.234  0.367  0.610  1.0
  Si  Si13  1  0.734  0.633  0.390  1.0
  Si  Si14  1  0.733  0.977  0.632  1.0
  Si  Si15  1  0.233  0.023  0.368  1.0
  O  O16  1  0.733  0.525  0.299  1.0
  O  O17  1  0.233  0.475  0.701  1.0
  O  O18  1  0.236  0.114  0.476  1.0
  O  O19  1  0.736  0.886  0.524  1.0
  O  O20  1  0.237  0.408  0.117  1.0
  O  O21  1  0.737  0.592  0.883  1.0
  O  O22  1  0.234  0.699  0.825  1.0
  O  O23  1  0.734  0.301  0.175  1.0
  O  O24  1  0.237  0.474  0.411  1.0
  O  O25  1  0.737  0.526  0.589  1.0
  O  O26  1  0.733  0.176  0.526  1.0
  O  O27  1  0.233  0.824  0.474  1.0
  O  O28  1  0.048  0.667  0.090  1.0
  O  O29  1  0.548  0.333  0.910  1.0
  O  O30  1  0.419  0.672  0.087  1.0
  O  O31  1  0.919  0.328  0.913  1.0
  O  O32  1  0.047  0.242  0.668  1.0
  O  O33  1  0.547  0.758  0.332  1.0
  O  O34  1  0.418  0.239  0.675  1.0
  O  O35  1  0.918  0.761  0.325  1.0
  O  O36  1  0.547  0.910  0.757  1.0
  O  O37  1  0.047  0.090  0.243  1.0
  O  O38  1  0.919  0.912  0.759  1.0
  O  O39  1  0.419  0.088  0.241  1.0
  O  O40  1  0.230  0.999  0.002  1.0
  O  O41  1  0.730  0.001  0.998  1.0
[/CIF]
.