The structure described by Ca3Si4(AgO7)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), and two equivalent O(7) atoms. In the second Ca site, Ca(2) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Ag site, Ag(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form AgO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners 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(4), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ag(2)O6 octahedra and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Ag(2)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 70°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ag(2), and one Si(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ag(1), and one Ag(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(2), one Ag(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ag(1), one Ag(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Ca(1), one Si(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Si(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(2), two equivalent Ca(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Ca3Si4(AgO7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.537
_cell_length_b   9.537
_cell_length_c   10.410
_cell_angle_alpha   61.171
_cell_angle_beta   61.171
_cell_angle_gamma   48.701
_symmetry_Int_Tables_number   1
_cell_volume   603.572
_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  0.240  0.152  0.537  1.0
  Ca  Ca1  1  0.848  0.760  0.963  1.0
  Ca  Ca2  1  0.152  0.240  0.037  1.0
  Ca  Ca3  1  0.659  0.341  0.250  1.0
  Ca  Ca4  1  0.760  0.848  0.463  1.0
  Ca  Ca5  1  0.341  0.659  0.750  1.0
  Si  Si6  1  0.092  0.536  0.671  1.0
  Si  Si7  1  0.536  0.092  0.171  1.0
  Si  Si8  1  0.230  0.515  0.140  1.0
  Si  Si9  1  0.515  0.230  0.640  1.0
  Si  Si10  1  0.464  0.908  0.829  1.0
  Si  Si11  1  0.770  0.485  0.860  1.0
  Si  Si12  1  0.485  0.770  0.360  1.0
  Si  Si13  1  0.908  0.464  0.329  1.0
  Ag  Ag14  1  0.227  0.773  0.250  1.0
  Ag  Ag15  1  0.773  0.227  0.750  1.0
  Ag  Ag16  1  0.000  0.000  0.000  1.0
  Ag  Ag17  1  0.000  0.000  0.500  1.0
  O  O18  1  0.328  0.856  0.506  1.0
  O  O19  1  0.898  0.970  0.722  1.0
  O  O20  1  0.632  0.474  0.819  1.0
  O  O21  1  0.970  0.898  0.222  1.0
  O  O22  1  0.979  0.260  0.459  1.0
  O  O23  1  0.511  0.063  0.801  1.0
  O  O24  1  0.474  0.632  0.319  1.0
  O  O25  1  0.740  0.021  0.041  1.0
  O  O26  1  0.489  0.937  0.199  1.0
  O  O27  1  0.698  0.645  0.399  1.0
  O  O28  1  0.102  0.030  0.278  1.0
  O  O29  1  0.021  0.740  0.541  1.0
  O  O30  1  0.937  0.489  0.699  1.0
  O  O31  1  0.856  0.328  0.006  1.0
  O  O32  1  0.645  0.698  0.899  1.0
  O  O33  1  0.260  0.979  0.959  1.0
  O  O34  1  0.471  0.903  0.673  1.0
  O  O35  1  0.302  0.355  0.601  1.0
  O  O36  1  0.097  0.529  0.827  1.0
  O  O37  1  0.355  0.302  0.101  1.0
  O  O38  1  0.063  0.511  0.301  1.0
  O  O39  1  0.030  0.102  0.778  1.0
  O  O40  1  0.903  0.471  0.173  1.0
  O  O41  1  0.368  0.526  0.181  1.0
  O  O42  1  0.529  0.097  0.327  1.0
  O  O43  1  0.526  0.368  0.681  1.0
  O  O44  1  0.144  0.672  0.994  1.0
  O  O45  1  0.672  0.144  0.494  1.0
[/CIF]
.
The structure described by Ca3Si4(AgO7)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), and two equivalent O(7) atoms. In the second Ca site, Ca(2) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(7) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Ag site, Ag(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form AgO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners 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(4), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ag(2)O6 octahedra and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Ag(2)O6 octahedra and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 70°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Ag(2), and one Si(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Ag(1), and one Ag(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(2), one Ag(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ca(1), one Ag(1), one Ag(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Ca(1), one Si(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Si(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(2), two equivalent Ca(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Ca3Si4(AgO7)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.537
_cell_length_b   9.537
_cell_length_c   10.410
_cell_angle_alpha   61.171
_cell_angle_beta   61.171
_cell_angle_gamma   48.701
_symmetry_Int_Tables_number   1
_cell_volume   603.572
_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  0.240  0.152  0.537  1.0
  Ca  Ca1  1  0.848  0.760  0.963  1.0
  Ca  Ca2  1  0.152  0.240  0.037  1.0
  Ca  Ca3  1  0.659  0.341  0.250  1.0
  Ca  Ca4  1  0.760  0.848  0.463  1.0
  Ca  Ca5  1  0.341  0.659  0.750  1.0
  Si  Si6  1  0.092  0.536  0.671  1.0
  Si  Si7  1  0.536  0.092  0.171  1.0
  Si  Si8  1  0.230  0.515  0.140  1.0
  Si  Si9  1  0.515  0.230  0.640  1.0
  Si  Si10  1  0.464  0.908  0.829  1.0
  Si  Si11  1  0.770  0.485  0.860  1.0
  Si  Si12  1  0.485  0.770  0.360  1.0
  Si  Si13  1  0.908  0.464  0.329  1.0
  Ag  Ag14  1  0.227  0.773  0.250  1.0
  Ag  Ag15  1  0.773  0.227  0.750  1.0
  Ag  Ag16  1  0.000  0.000  0.000  1.0
  Ag  Ag17  1  0.000  0.000  0.500  1.0
  O  O18  1  0.328  0.856  0.506  1.0
  O  O19  1  0.898  0.970  0.722  1.0
  O  O20  1  0.632  0.474  0.819  1.0
  O  O21  1  0.970  0.898  0.222  1.0
  O  O22  1  0.979  0.260  0.459  1.0
  O  O23  1  0.511  0.063  0.801  1.0
  O  O24  1  0.474  0.632  0.319  1.0
  O  O25  1  0.740  0.021  0.041  1.0
  O  O26  1  0.489  0.937  0.199  1.0
  O  O27  1  0.698  0.645  0.399  1.0
  O  O28  1  0.102  0.030  0.278  1.0
  O  O29  1  0.021  0.740  0.541  1.0
  O  O30  1  0.937  0.489  0.699  1.0
  O  O31  1  0.856  0.328  0.006  1.0
  O  O32  1  0.645  0.698  0.899  1.0
  O  O33  1  0.260  0.979  0.959  1.0
  O  O34  1  0.471  0.903  0.673  1.0
  O  O35  1  0.302  0.355  0.601  1.0
  O  O36  1  0.097  0.529  0.827  1.0
  O  O37  1  0.355  0.302  0.101  1.0
  O  O38  1  0.063  0.511  0.301  1.0
  O  O39  1  0.030  0.102  0.778  1.0
  O  O40  1  0.903  0.471  0.173  1.0
  O  O41  1  0.368  0.526  0.181  1.0
  O  O42  1  0.529  0.097  0.327  1.0
  O  O43  1  0.526  0.368  0.681  1.0
  O  O44  1  0.144  0.672  0.994  1.0
  O  O45  1  0.672  0.144  0.494  1.0
[/CIF]
.