The compound described by SrSiO3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted SrO8 hexagonal bipyramids that share  a cornercorner with one Sr(1)O8 hexagonal bipyramid,  a cornercorner with one Sr(2)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Sr(1)O8 hexagonal bipyramids, edges with three equivalent Sr(2)O8 hexagonal bipyramids,  an edgeedge with one Si(2)O4 tetrahedra, and edges with three equivalent Si(1)O4 tetrahedra. In the second Sr site, Sr(2) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SrO8 hexagonal bipyramids that share corners with two equivalent Sr(1)O8 hexagonal bipyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with six equivalent Sr(1)O8 hexagonal bipyramids, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Sr(1)O8 hexagonal bipyramid,  a cornercorner with one Sr(2)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Sr(2)O8 hexagonal bipyramid, and edges with three equivalent Sr(1)O8 hexagonal bipyramids. In the second Si site, Si(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Sr(1)O8 hexagonal bipyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Sr(1)O8 hexagonal bipyramids, and edges with two equivalent Sr(2)O8 hexagonal bipyramids. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Si(1), and one Si(2) atom. In the second O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(2) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Si(1) atoms. In the fourth O site, O(1) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_SrSiO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.136
_cell_length_b   7.136
_cell_length_c   10.904
_cell_angle_alpha   71.421
_cell_angle_beta   71.421
_cell_angle_gamma   60.160
_symmetry_Int_Tables_number   1
_cell_volume   447.856
_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
  Sr  Sr0  1  0.154  0.673  0.999  1.0
  Sr  Sr1  1  0.327  0.846  0.501  1.0
  Sr  Sr2  1  0.846  0.327  0.001  1.0
  Sr  Sr3  1  0.673  0.154  0.499  1.0
  Sr  Sr4  1  0.000  0.500  0.500  1.0
  Sr  Sr5  1  0.500  0.000  0.000  1.0
  Si  Si6  1  0.334  0.418  0.746  1.0
  Si  Si7  1  0.582  0.666  0.754  1.0
  Si  Si8  1  0.666  0.582  0.254  1.0
  Si  Si9  1  0.418  0.334  0.246  1.0
  Si  Si10  1  0.832  0.168  0.750  1.0
  Si  Si11  1  0.168  0.832  0.250  1.0
  O  O12  1  0.281  0.465  0.605  1.0
  O  O13  1  0.535  0.719  0.895  1.0
  O  O14  1  0.719  0.535  0.395  1.0
  O  O15  1  0.465  0.281  0.105  1.0
  O  O16  1  0.183  0.372  0.885  1.0
  O  O17  1  0.628  0.817  0.615  1.0
  O  O18  1  0.817  0.628  0.115  1.0
  O  O19  1  0.372  0.183  0.385  1.0
  O  O20  1  0.583  0.204  0.748  1.0
  O  O21  1  0.796  0.417  0.752  1.0
  O  O22  1  0.417  0.796  0.252  1.0
  O  O23  1  0.204  0.583  0.248  1.0
  O  O24  1  0.887  0.018  0.889  1.0
  O  O25  1  0.982  0.113  0.611  1.0
  O  O26  1  0.113  0.982  0.111  1.0
  O  O27  1  0.018  0.887  0.389  1.0
  O  O28  1  0.369  0.631  0.750  1.0
  O  O29  1  0.631  0.369  0.250  1.0
[/CIF]
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The compound described by SrSiO3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted SrO8 hexagonal bipyramids that share  a cornercorner with one Sr(1)O8 hexagonal bipyramid,  a cornercorner with one Sr(2)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Sr(1)O8 hexagonal bipyramids, edges with three equivalent Sr(2)O8 hexagonal bipyramids,  an edgeedge with one Si(2)O4 tetrahedra, and edges with three equivalent Si(1)O4 tetrahedra. In the second Sr site, Sr(2) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SrO8 hexagonal bipyramids that share corners with two equivalent Sr(1)O8 hexagonal bipyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with six equivalent Sr(1)O8 hexagonal bipyramids, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Sr(1)O8 hexagonal bipyramid,  a cornercorner with one Sr(2)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Sr(2)O8 hexagonal bipyramid, and edges with three equivalent Sr(1)O8 hexagonal bipyramids. In the second Si site, Si(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Sr(1)O8 hexagonal bipyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Sr(1)O8 hexagonal bipyramids, and edges with two equivalent Sr(2)O8 hexagonal bipyramids. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Si(1), and one Si(2) atom. In the second O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(2) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Si(1) atoms. In the fourth O site, O(1) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_SrSiO3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.136
_cell_length_b   7.136
_cell_length_c   10.904
_cell_angle_alpha   71.421
_cell_angle_beta   71.421
_cell_angle_gamma   60.160
_symmetry_Int_Tables_number   1
_cell_volume   447.856
_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
  Sr  Sr0  1  0.154  0.673  0.999  1.0
  Sr  Sr1  1  0.327  0.846  0.501  1.0
  Sr  Sr2  1  0.846  0.327  0.001  1.0
  Sr  Sr3  1  0.673  0.154  0.499  1.0
  Sr  Sr4  1  0.000  0.500  0.500  1.0
  Sr  Sr5  1  0.500  0.000  0.000  1.0
  Si  Si6  1  0.334  0.418  0.746  1.0
  Si  Si7  1  0.582  0.666  0.754  1.0
  Si  Si8  1  0.666  0.582  0.254  1.0
  Si  Si9  1  0.418  0.334  0.246  1.0
  Si  Si10  1  0.832  0.168  0.750  1.0
  Si  Si11  1  0.168  0.832  0.250  1.0
  O  O12  1  0.281  0.465  0.605  1.0
  O  O13  1  0.535  0.719  0.895  1.0
  O  O14  1  0.719  0.535  0.395  1.0
  O  O15  1  0.465  0.281  0.105  1.0
  O  O16  1  0.183  0.372  0.885  1.0
  O  O17  1  0.628  0.817  0.615  1.0
  O  O18  1  0.817  0.628  0.115  1.0
  O  O19  1  0.372  0.183  0.385  1.0
  O  O20  1  0.583  0.204  0.748  1.0
  O  O21  1  0.796  0.417  0.752  1.0
  O  O22  1  0.417  0.796  0.252  1.0
  O  O23  1  0.204  0.583  0.248  1.0
  O  O24  1  0.887  0.018  0.889  1.0
  O  O25  1  0.982  0.113  0.611  1.0
  O  O26  1  0.113  0.982  0.111  1.0
  O  O27  1  0.018  0.887  0.389  1.0
  O  O28  1  0.369  0.631  0.750  1.0
  O  O29  1  0.631  0.369  0.250  1.0
[/CIF]
.