The crystal structure described by Ca3(SiO5)2 crystallizes in the monoclinic Cc space group. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the second Ca site, Ca(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(7), and one O(8) atom. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(7), and one O(8) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(5), and one O(6) atom. There are ten inequivalent O sites. In the first O site, O(7) is bonded to one Ca(1), one Ca(2), one Ca(3), and one Si(1) atom to form distorted corner-sharing OCa3Si tetrahedra. In the second O site, O(8) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), and one Si(1) atom. In the third O site, O(9) is bonded in a bent 150 degrees geometry to one Ca(3) and one O(10) atom. In the fourth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Ca(3) and one O(9) atom. In the fifth O site, O(1) is bonded in a bent 150 degrees geometry to one Ca(2) and one Si(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(3), and one Si(2) atom. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one Ca(2) and one Si(2) atom. In the eighth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ca(1) and one Si(1) atom. In the ninth O site, O(5) is bonded to one Ca(1), one Ca(2), one Ca(3), and one Si(2) atom to form distorted corner-sharing OCa3Si tetrahedra. In the tenth O site, O(6) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(3), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca3(SiO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.593
_cell_length_b   8.364
_cell_length_c   10.163
_cell_angle_alpha   79.314
_cell_angle_beta   74.027
_cell_angle_gamma   70.465
_symmetry_Int_Tables_number   1
_cell_volume   428.480
_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  0.382  0.419  0.800  1.0
  Ca  Ca1  1  0.899  0.919  0.300  1.0
  Ca  Ca2  1  0.084  0.101  0.699  1.0
  Ca  Ca3  1  0.616  0.601  0.199  1.0
  Ca  Ca4  1  0.949  0.523  0.521  1.0
  Ca  Ca5  1  0.507  0.023  0.021  1.0
  Si  Si6  1  0.558  0.266  0.514  1.0
  Si  Si7  1  0.162  0.766  0.014  1.0
  Si  Si8  1  0.409  0.755  0.491  1.0
  Si  Si9  1  0.845  0.255  0.991  1.0
  O  O10  1  0.217  0.881  0.864  1.0
  O  O11  1  0.538  0.381  0.364  1.0
  O  O12  1  0.469  0.639  0.635  1.0
  O  O13  1  0.757  0.139  0.135  1.0
  O  O14  1  0.290  0.962  0.503  1.0
  O  O15  1  0.744  0.462  0.003  1.0
  O  O16  1  0.656  0.060  0.495  1.0
  O  O17  1  0.289  0.560  0.995  1.0
  O  O18  1  0.720  0.210  0.878  1.0
  O  O19  1  0.692  0.710  0.378  1.0
  O  O20  1  0.162  0.214  0.932  1.0
  O  O21  1  0.192  0.714  0.432  1.0
  O  O22  1  0.270  0.321  0.621  1.0
  O  O23  1  0.287  0.821  0.121  1.0
  O  O24  1  0.770  0.298  0.581  1.0
  O  O25  1  0.850  0.798  0.081  1.0
  O  O26  1  0.824  0.701  0.747  1.0
  O  O27  1  0.228  0.201  0.247  1.0
  O  O28  1  0.719  0.851  0.773  1.0
  O  O29  1  0.157  0.351  0.273  1.0
[/CIF]
.
The crystal structure described by Ca3(SiO5)2 crystallizes in the monoclinic Cc space group. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the second Ca site, Ca(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(7), and one O(8) atom. In the third Ca site, Ca(3) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(7), and one O(8) atom. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(5), and one O(6) atom. There are ten inequivalent O sites. In the first O site, O(7) is bonded to one Ca(1), one Ca(2), one Ca(3), and one Si(1) atom to form distorted corner-sharing OCa3Si tetrahedra. In the second O site, O(8) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ca(3), and one Si(1) atom. In the third O site, O(9) is bonded in a bent 150 degrees geometry to one Ca(3) and one O(10) atom. In the fourth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Ca(3) and one O(9) atom. In the fifth O site, O(1) is bonded in a bent 150 degrees geometry to one Ca(2) and one Si(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(3), and one Si(2) atom. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one Ca(2) and one Si(2) atom. In the eighth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ca(1) and one Si(1) atom. In the ninth O site, O(5) is bonded to one Ca(1), one Ca(2), one Ca(3), and one Si(2) atom to form distorted corner-sharing OCa3Si tetrahedra. In the tenth O site, O(6) is bonded in a 3-coordinate geometry to one Ca(1), one Ca(3), and one Si(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca3(SiO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.593
_cell_length_b   8.364
_cell_length_c   10.163
_cell_angle_alpha   79.314
_cell_angle_beta   74.027
_cell_angle_gamma   70.465
_symmetry_Int_Tables_number   1
_cell_volume   428.480
_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  0.382  0.419  0.800  1.0
  Ca  Ca1  1  0.899  0.919  0.300  1.0
  Ca  Ca2  1  0.084  0.101  0.699  1.0
  Ca  Ca3  1  0.616  0.601  0.199  1.0
  Ca  Ca4  1  0.949  0.523  0.521  1.0
  Ca  Ca5  1  0.507  0.023  0.021  1.0
  Si  Si6  1  0.558  0.266  0.514  1.0
  Si  Si7  1  0.162  0.766  0.014  1.0
  Si  Si8  1  0.409  0.755  0.491  1.0
  Si  Si9  1  0.845  0.255  0.991  1.0
  O  O10  1  0.217  0.881  0.864  1.0
  O  O11  1  0.538  0.381  0.364  1.0
  O  O12  1  0.469  0.639  0.635  1.0
  O  O13  1  0.757  0.139  0.135  1.0
  O  O14  1  0.290  0.962  0.503  1.0
  O  O15  1  0.744  0.462  0.003  1.0
  O  O16  1  0.656  0.060  0.495  1.0
  O  O17  1  0.289  0.560  0.995  1.0
  O  O18  1  0.720  0.210  0.878  1.0
  O  O19  1  0.692  0.710  0.378  1.0
  O  O20  1  0.162  0.214  0.932  1.0
  O  O21  1  0.192  0.714  0.432  1.0
  O  O22  1  0.270  0.321  0.621  1.0
  O  O23  1  0.287  0.821  0.121  1.0
  O  O24  1  0.770  0.298  0.581  1.0
  O  O25  1  0.850  0.798  0.081  1.0
  O  O26  1  0.824  0.701  0.747  1.0
  O  O27  1  0.228  0.201  0.247  1.0
  O  O28  1  0.719  0.851  0.773  1.0
  O  O29  1  0.157  0.351  0.273  1.0
[/CIF]
.