The material described by Sr2Cu(SeO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(6), two equivalent O(7), and two equivalent O(8) atoms. Cu(1) is bonded in a distorted trigonal bipyramidal geometry to one O(1), one O(2), one O(4), one O(5), and one O(9) atom. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(7), one O(8), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Sr(1), one Cu(1), and one Se(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Cu(1), and one Se(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one Se(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(2), one Cu(1), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Cu(1), and one Se(1) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Sr(1), one Sr(2), and one Se(1) atom. In the seventh O site, O(7) is bonded to one Sr(1), two equivalent Sr(2), and one Se(3) atom to form distorted OSr3Se tetrahedra that share  a cornercorner with one O(9)Sr2CuSe tetrahedra,  an edgeedge with one O(9)Sr2CuSe tetrahedra, and  an edgeedge with one O(7)Sr3Se tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Sr(2) and one Se(3) atom. In the ninth O site, O(9) is bonded to two equivalent Sr(1), one Cu(1), and one Se(3) atom to form distorted OSr2CuSe tetrahedra that share  a cornercorner with one O(7)Sr3Se tetrahedra,  an edgeedge with one O(9)Sr2CuSe tetrahedra, and  an edgeedge with one O(7)Sr3Se tetrahedra. is represented by the CIF file [CIF]
data_Sr2Cu(SeO3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.329
_cell_length_b   7.894
_cell_length_c   8.778
_cell_angle_alpha   102.263
_cell_angle_beta   105.350
_cell_angle_gamma   96.669
_symmetry_Int_Tables_number   1
_cell_volume   470.521
_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
  Sr  Sr0  1  0.624  0.484  0.807  1.0
  Sr  Sr1  1  0.376  0.516  0.193  1.0
  Sr  Sr2  1  0.759  0.910  0.609  1.0
  Sr  Sr3  1  0.241  0.090  0.391  1.0
  Cu  Cu4  1  0.086  0.341  0.748  1.0
  Cu  Cu5  1  0.914  0.659  0.252  1.0
  Se  Se6  1  0.900  0.202  0.030  1.0
  Se  Se7  1  0.227  0.631  0.587  1.0
  Se  Se8  1  0.365  0.082  0.795  1.0
  Se  Se9  1  0.635  0.918  0.205  1.0
  Se  Se10  1  0.773  0.369  0.413  1.0
  Se  Se11  1  0.100  0.798  0.970  1.0
  O  O12  1  0.171  0.623  0.379  1.0
  O  O13  1  0.829  0.377  0.621  1.0
  O  O14  1  0.223  0.407  0.590  1.0
  O  O15  1  0.777  0.593  0.410  1.0
  O  O16  1  0.471  0.701  0.649  1.0
  O  O17  1  0.529  0.299  0.351  1.0
  O  O18  1  0.058  0.818  0.159  1.0
  O  O19  1  0.942  0.182  0.841  1.0
  O  O20  1  0.185  0.603  0.942  1.0
  O  O21  1  0.815  0.397  0.058  1.0
  O  O22  1  0.875  0.752  0.833  1.0
  O  O23  1  0.125  0.248  0.167  1.0
  O  O24  1  0.485  0.871  0.318  1.0
  O  O25  1  0.515  0.129  0.682  1.0
  O  O26  1  0.847  0.998  0.358  1.0
  O  O27  1  0.153  0.002  0.642  1.0
  O  O28  1  0.662  0.702  0.119  1.0
  O  O29  1  0.338  0.298  0.881  1.0
[/CIF]
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The material described by Sr2Cu(SeO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(6), two equivalent O(7), and two equivalent O(8) atoms. Cu(1) is bonded in a distorted trigonal bipyramidal geometry to one O(1), one O(2), one O(4), one O(5), and one O(9) atom. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(7), one O(8), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Sr(1), one Cu(1), and one Se(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Cu(1), and one Se(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one Se(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(2), one Cu(1), and one Se(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Cu(1), and one Se(1) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Sr(1), one Sr(2), and one Se(1) atom. In the seventh O site, O(7) is bonded to one Sr(1), two equivalent Sr(2), and one Se(3) atom to form distorted OSr3Se tetrahedra that share  a cornercorner with one O(9)Sr2CuSe tetrahedra,  an edgeedge with one O(9)Sr2CuSe tetrahedra, and  an edgeedge with one O(7)Sr3Se tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Sr(2) and one Se(3) atom. In the ninth O site, O(9) is bonded to two equivalent Sr(1), one Cu(1), and one Se(3) atom to form distorted OSr2CuSe tetrahedra that share  a cornercorner with one O(7)Sr3Se tetrahedra,  an edgeedge with one O(9)Sr2CuSe tetrahedra, and  an edgeedge with one O(7)Sr3Se tetrahedra. is represented by the CIF file [CIF]
data_Sr2Cu(SeO3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.329
_cell_length_b   7.894
_cell_length_c   8.778
_cell_angle_alpha   102.263
_cell_angle_beta   105.350
_cell_angle_gamma   96.669
_symmetry_Int_Tables_number   1
_cell_volume   470.521
_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
  Sr  Sr0  1  0.624  0.484  0.807  1.0
  Sr  Sr1  1  0.376  0.516  0.193  1.0
  Sr  Sr2  1  0.759  0.910  0.609  1.0
  Sr  Sr3  1  0.241  0.090  0.391  1.0
  Cu  Cu4  1  0.086  0.341  0.748  1.0
  Cu  Cu5  1  0.914  0.659  0.252  1.0
  Se  Se6  1  0.900  0.202  0.030  1.0
  Se  Se7  1  0.227  0.631  0.587  1.0
  Se  Se8  1  0.365  0.082  0.795  1.0
  Se  Se9  1  0.635  0.918  0.205  1.0
  Se  Se10  1  0.773  0.369  0.413  1.0
  Se  Se11  1  0.100  0.798  0.970  1.0
  O  O12  1  0.171  0.623  0.379  1.0
  O  O13  1  0.829  0.377  0.621  1.0
  O  O14  1  0.223  0.407  0.590  1.0
  O  O15  1  0.777  0.593  0.410  1.0
  O  O16  1  0.471  0.701  0.649  1.0
  O  O17  1  0.529  0.299  0.351  1.0
  O  O18  1  0.058  0.818  0.159  1.0
  O  O19  1  0.942  0.182  0.841  1.0
  O  O20  1  0.185  0.603  0.942  1.0
  O  O21  1  0.815  0.397  0.058  1.0
  O  O22  1  0.875  0.752  0.833  1.0
  O  O23  1  0.125  0.248  0.167  1.0
  O  O24  1  0.485  0.871  0.318  1.0
  O  O25  1  0.515  0.129  0.682  1.0
  O  O26  1  0.847  0.998  0.358  1.0
  O  O27  1  0.153  0.002  0.642  1.0
  O  O28  1  0.662  0.702  0.119  1.0
  O  O29  1  0.338  0.298  0.881  1.0
[/CIF]
.