The crystal structure described by Ca2Y3Si3O13 crystallizes in the monoclinic P2_1/m space group. Ca(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(10), one O(2), one O(4), two equivalent O(8), and two equivalent O(9) atoms 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(5), one O(6), two equivalent O(7), and two equivalent O(8) atoms 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(10), one O(3), two equivalent O(7), and two equivalent O(9) atoms 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), and two equivalent O(7) atoms 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(5), and two equivalent O(8) atoms 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(2), one O(6), and two equivalent O(9) atoms 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 ten inequivalent O sites. In the first O site, O(8) is bonded in a 1-coordinate geometry to one Ca(1), one Y(1), one Y(2), and one Si(2) atom. In the second O site, O(9) is bonded in a 4-coordinate geometry to one Ca(1), one Y(1), one Y(3), and one Si(3) atom. In the third O site, O(10) is bonded in a trigonal planar geometry to one Y(1), one Y(2), and one Y(3) atom. In the fourth O site, O(1) is bonded to two equivalent Ca(1), one Y(3), and one Si(2) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Y(1), and one Si(3) atom. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Y(3), and one Si(1) atom. In the seventh O site, O(4) is bonded to two equivalent Ca(1), one Y(1), and one Si(1) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the eighth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Y(2), and one Si(2) atom. In the ninth O site, O(6) is bonded to two equivalent Ca(1), one Y(2), and one Si(3) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the tenth 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. is represented by the CIF file [CIF]
data_Ca2Y3Si3O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.912
_cell_length_b   9.443
_cell_length_c   9.444
_cell_angle_alpha   60.187
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   534.838
_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  0.503  0.669  0.665  1.0
  Ca  Ca1  1  0.003  0.331  0.335  1.0
  Ca  Ca2  1  0.997  0.669  0.665  1.0
  Ca  Ca3  1  0.497  0.331  0.335  1.0
  Y  Y4  1  0.250  0.007  0.240  1.0
  Y  Y5  1  0.750  0.993  0.760  1.0
  Y  Y6  1  0.250  0.244  0.752  1.0
  Y  Y7  1  0.750  0.756  0.248  1.0
  Y  Y8  1  0.750  0.247  0.994  1.0
  Y  Y9  1  0.250  0.753  0.006  1.0
  Si  Si10  1  0.250  0.392  0.977  1.0
  Si  Si11  1  0.750  0.608  0.023  1.0
  Si  Si12  1  0.250  0.633  0.389  1.0
  Si  Si13  1  0.750  0.367  0.611  1.0
  Si  Si14  1  0.750  0.023  0.368  1.0
  Si  Si15  1  0.250  0.977  0.632  1.0
  O  O16  1  0.750  0.476  0.700  1.0
  O  O17  1  0.250  0.524  0.300  1.0
  O  O18  1  0.250  0.885  0.524  1.0
  O  O19  1  0.750  0.115  0.476  1.0
  O  O20  1  0.250  0.592  0.884  1.0
  O  O21  1  0.750  0.408  0.116  1.0
  O  O22  1  0.250  0.301  0.175  1.0
  O  O23  1  0.750  0.699  0.825  1.0
  O  O24  1  0.250  0.527  0.589  1.0
  O  O25  1  0.750  0.473  0.411  1.0
  O  O26  1  0.750  0.824  0.475  1.0
  O  O27  1  0.250  0.176  0.525  1.0
  O  O28  1  0.437  0.333  0.910  1.0
  O  O29  1  0.937  0.667  0.090  1.0
  O  O30  1  0.063  0.333  0.910  1.0
  O  O31  1  0.563  0.667  0.090  1.0
  O  O32  1  0.437  0.759  0.331  1.0
  O  O33  1  0.937  0.241  0.669  1.0
  O  O34  1  0.063  0.759  0.331  1.0
  O  O35  1  0.563  0.241  0.669  1.0
  O  O36  1  0.937  0.090  0.242  1.0
  O  O37  1  0.437  0.910  0.758  1.0
  O  O38  1  0.563  0.090  0.242  1.0
  O  O39  1  0.063  0.910  0.758  1.0
  O  O40  1  0.250  0.001  0.998  1.0
  O  O41  1  0.750  0.999  0.002  1.0
[/CIF]
.
The crystal structure described by Ca2Y3Si3O13 crystallizes in the monoclinic P2_1/m space group. Ca(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one O(10), one O(2), one O(4), two equivalent O(8), and two equivalent O(9) atoms 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(5), one O(6), two equivalent O(7), and two equivalent O(8) atoms 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(10), one O(3), two equivalent O(7), and two equivalent O(9) atoms 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), and two equivalent O(7) atoms 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(5), and two equivalent O(8) atoms 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(2), one O(6), and two equivalent O(9) atoms 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 ten inequivalent O sites. In the first O site, O(8) is bonded in a 1-coordinate geometry to one Ca(1), one Y(1), one Y(2), and one Si(2) atom. In the second O site, O(9) is bonded in a 4-coordinate geometry to one Ca(1), one Y(1), one Y(3), and one Si(3) atom. In the third O site, O(10) is bonded in a trigonal planar geometry to one Y(1), one Y(2), and one Y(3) atom. In the fourth O site, O(1) is bonded to two equivalent Ca(1), one Y(3), and one Si(2) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Y(1), and one Si(3) atom. In the sixth O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Y(3), and one Si(1) atom. In the seventh O site, O(4) is bonded to two equivalent Ca(1), one Y(1), and one Si(1) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the eighth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Y(2), and one Si(2) atom. In the ninth O site, O(6) is bonded to two equivalent Ca(1), one Y(2), and one Si(3) atom to form distorted edge-sharing OCa2YSi tetrahedra. In the tenth 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. is represented by the CIF file [CIF]
data_Ca2Y3Si3O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.912
_cell_length_b   9.443
_cell_length_c   9.444
_cell_angle_alpha   60.187
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   534.838
_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  0.503  0.669  0.665  1.0
  Ca  Ca1  1  0.003  0.331  0.335  1.0
  Ca  Ca2  1  0.997  0.669  0.665  1.0
  Ca  Ca3  1  0.497  0.331  0.335  1.0
  Y  Y4  1  0.250  0.007  0.240  1.0
  Y  Y5  1  0.750  0.993  0.760  1.0
  Y  Y6  1  0.250  0.244  0.752  1.0
  Y  Y7  1  0.750  0.756  0.248  1.0
  Y  Y8  1  0.750  0.247  0.994  1.0
  Y  Y9  1  0.250  0.753  0.006  1.0
  Si  Si10  1  0.250  0.392  0.977  1.0
  Si  Si11  1  0.750  0.608  0.023  1.0
  Si  Si12  1  0.250  0.633  0.389  1.0
  Si  Si13  1  0.750  0.367  0.611  1.0
  Si  Si14  1  0.750  0.023  0.368  1.0
  Si  Si15  1  0.250  0.977  0.632  1.0
  O  O16  1  0.750  0.476  0.700  1.0
  O  O17  1  0.250  0.524  0.300  1.0
  O  O18  1  0.250  0.885  0.524  1.0
  O  O19  1  0.750  0.115  0.476  1.0
  O  O20  1  0.250  0.592  0.884  1.0
  O  O21  1  0.750  0.408  0.116  1.0
  O  O22  1  0.250  0.301  0.175  1.0
  O  O23  1  0.750  0.699  0.825  1.0
  O  O24  1  0.250  0.527  0.589  1.0
  O  O25  1  0.750  0.473  0.411  1.0
  O  O26  1  0.750  0.824  0.475  1.0
  O  O27  1  0.250  0.176  0.525  1.0
  O  O28  1  0.437  0.333  0.910  1.0
  O  O29  1  0.937  0.667  0.090  1.0
  O  O30  1  0.063  0.333  0.910  1.0
  O  O31  1  0.563  0.667  0.090  1.0
  O  O32  1  0.437  0.759  0.331  1.0
  O  O33  1  0.937  0.241  0.669  1.0
  O  O34  1  0.063  0.759  0.331  1.0
  O  O35  1  0.563  0.241  0.669  1.0
  O  O36  1  0.937  0.090  0.242  1.0
  O  O37  1  0.437  0.910  0.758  1.0
  O  O38  1  0.563  0.090  0.242  1.0
  O  O39  1  0.063  0.910  0.758  1.0
  O  O40  1  0.250  0.001  0.998  1.0
  O  O41  1  0.750  0.999  0.002  1.0
[/CIF]
.