The material described by Ag2SeO4 crystallizes in the triclinic P1 space group. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(8) atom. In the second Ag site, Ag(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(6), and one O(7) atom. In the third Ag site, Ag(3) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. In the fourth Ag site, Ag(4) 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. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(2), one Ag(3), and one Se(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(2), one Ag(4), and one Se(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ag(1), one Ag(3), and one Se(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(2), one Ag(4), and one Se(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(3), one Ag(4), and one Se(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ag(2), one Ag(3), one Ag(4), and one Se(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ag(2), one Ag(3), one Ag(4), and one Se(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(3), one Ag(4), and one Se(2) atom. is represented by the CIF file [CIF]
data_Ag2SeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.589
_cell_length_b   7.077
_cell_length_c   6.458
_cell_angle_alpha   78.634
_cell_angle_beta   53.880
_cell_angle_gamma   47.486
_symmetry_Int_Tables_number   1
_cell_volume   219.987
_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
  Ag  Ag0  1  0.178  0.579  0.178  1.0
  Ag  Ag1  1  0.577  0.180  0.567  1.0
  Ag  Ag2  1  0.833  0.421  0.815  1.0
  Ag  Ag3  1  0.426  0.821  0.420  1.0
  Se  Se4  1  0.879  0.866  0.876  1.0
  Se  Se5  1  0.128  0.129  0.118  1.0
  O  O6  1  0.711  0.187  0.864  1.0
  O  O7  1  0.730  0.863  0.200  1.0
  O  O8  1  0.879  0.722  0.697  1.0
  O  O9  1  0.192  0.713  0.733  1.0
  O  O10  1  0.294  0.807  0.139  1.0
  O  O11  1  0.273  0.123  0.798  1.0
  O  O12  1  0.802  0.291  0.276  1.0
  O  O13  1  0.132  0.264  0.302  1.0
[/CIF]
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The material described by Ag2SeO4 crystallizes in the triclinic P1 space group. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(8) atom. In the second Ag site, Ag(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(6), and one O(7) atom. In the third Ag site, Ag(3) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. In the fourth Ag site, Ag(4) 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. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(2), one Ag(3), and one Se(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(2), one Ag(4), and one Se(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ag(1), one Ag(3), and one Se(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(2), one Ag(4), and one Se(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(3), one Ag(4), and one Se(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ag(2), one Ag(3), one Ag(4), and one Se(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ag(2), one Ag(3), one Ag(4), and one Se(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(3), one Ag(4), and one Se(2) atom. is represented by the CIF file [CIF]
data_Ag2SeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.589
_cell_length_b   7.077
_cell_length_c   6.458
_cell_angle_alpha   78.634
_cell_angle_beta   53.880
_cell_angle_gamma   47.486
_symmetry_Int_Tables_number   1
_cell_volume   219.987
_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
  Ag  Ag0  1  0.178  0.579  0.178  1.0
  Ag  Ag1  1  0.577  0.180  0.567  1.0
  Ag  Ag2  1  0.833  0.421  0.815  1.0
  Ag  Ag3  1  0.426  0.821  0.420  1.0
  Se  Se4  1  0.879  0.866  0.876  1.0
  Se  Se5  1  0.128  0.129  0.118  1.0
  O  O6  1  0.711  0.187  0.864  1.0
  O  O7  1  0.730  0.863  0.200  1.0
  O  O8  1  0.879  0.722  0.697  1.0
  O  O9  1  0.192  0.713  0.733  1.0
  O  O10  1  0.294  0.807  0.139  1.0
  O  O11  1  0.273  0.123  0.798  1.0
  O  O12  1  0.802  0.291  0.276  1.0
  O  O13  1  0.132  0.264  0.302  1.0
[/CIF]
.