The crystal structure described by Hg2PO4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted L-shaped geometry to one O(2) and one O(3) atom. In the second Hg site, Hg(2) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(1) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. In the second P site, P(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to one Hg(1), one Hg(2), and one P(1) atom. In the second O site, O(4) is bonded in a single-bond geometry to one P(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Hg(2) and one P(2) atom. In the fourth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Hg(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Hg2PO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.958
_cell_length_b   7.958
_cell_length_c   8.185
_cell_angle_alpha   77.077
_cell_angle_beta   77.077
_cell_angle_gamma   105.622
_symmetry_Int_Tables_number   1
_cell_volume   463.784
_cell_formula_units_Z   4
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
  Hg  Hg0  1  0.763  0.559  0.050  1.0
  Hg  Hg1  1  0.441  0.237  0.450  1.0
  Hg  Hg2  1  0.237  0.441  0.950  1.0
  Hg  Hg3  1  0.559  0.763  0.550  1.0
  Hg  Hg4  1  0.925  0.566  0.298  1.0
  Hg  Hg5  1  0.434  0.075  0.202  1.0
  Hg  Hg6  1  0.075  0.434  0.702  1.0
  Hg  Hg7  1  0.566  0.925  0.798  1.0
  P  P8  1  0.050  0.950  0.750  1.0
  P  P9  1  0.950  0.050  0.250  1.0
  P  P10  1  0.363  0.637  0.250  1.0
  P  P11  1  0.637  0.363  0.750  1.0
  O  O12  1  0.407  0.824  0.111  1.0
  O  O13  1  0.176  0.593  0.389  1.0
  O  O14  1  0.593  0.176  0.889  1.0
  O  O15  1  0.824  0.407  0.611  1.0
  O  O16  1  0.365  0.489  0.155  1.0
  O  O17  1  0.511  0.635  0.345  1.0
  O  O18  1  0.635  0.511  0.845  1.0
  O  O19  1  0.489  0.365  0.655  1.0
  O  O20  1  0.849  0.893  0.873  1.0
  O  O21  1  0.107  0.151  0.627  1.0
  O  O22  1  0.151  0.107  0.127  1.0
  O  O23  1  0.893  0.849  0.373  1.0
  O  O24  1  0.180  0.932  0.862  1.0
  O  O25  1  0.068  0.820  0.638  1.0
  O  O26  1  0.820  0.068  0.138  1.0
  O  O27  1  0.932  0.180  0.362  1.0
[/CIF]
.
The crystal structure described by Hg2PO4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted L-shaped geometry to one O(2) and one O(3) atom. In the second Hg site, Hg(2) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(1) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. In the second P site, P(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to one Hg(1), one Hg(2), and one P(1) atom. In the second O site, O(4) is bonded in a single-bond geometry to one P(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Hg(2) and one P(2) atom. In the fourth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Hg(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Hg2PO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.958
_cell_length_b   7.958
_cell_length_c   8.185
_cell_angle_alpha   77.077
_cell_angle_beta   77.077
_cell_angle_gamma   105.622
_symmetry_Int_Tables_number   1
_cell_volume   463.784
_cell_formula_units_Z   4
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
  Hg  Hg0  1  0.763  0.559  0.050  1.0
  Hg  Hg1  1  0.441  0.237  0.450  1.0
  Hg  Hg2  1  0.237  0.441  0.950  1.0
  Hg  Hg3  1  0.559  0.763  0.550  1.0
  Hg  Hg4  1  0.925  0.566  0.298  1.0
  Hg  Hg5  1  0.434  0.075  0.202  1.0
  Hg  Hg6  1  0.075  0.434  0.702  1.0
  Hg  Hg7  1  0.566  0.925  0.798  1.0
  P  P8  1  0.050  0.950  0.750  1.0
  P  P9  1  0.950  0.050  0.250  1.0
  P  P10  1  0.363  0.637  0.250  1.0
  P  P11  1  0.637  0.363  0.750  1.0
  O  O12  1  0.407  0.824  0.111  1.0
  O  O13  1  0.176  0.593  0.389  1.0
  O  O14  1  0.593  0.176  0.889  1.0
  O  O15  1  0.824  0.407  0.611  1.0
  O  O16  1  0.365  0.489  0.155  1.0
  O  O17  1  0.511  0.635  0.345  1.0
  O  O18  1  0.635  0.511  0.845  1.0
  O  O19  1  0.489  0.365  0.655  1.0
  O  O20  1  0.849  0.893  0.873  1.0
  O  O21  1  0.107  0.151  0.627  1.0
  O  O22  1  0.151  0.107  0.127  1.0
  O  O23  1  0.893  0.849  0.373  1.0
  O  O24  1  0.180  0.932  0.862  1.0
  O  O25  1  0.068  0.820  0.638  1.0
  O  O26  1  0.820  0.068  0.138  1.0
  O  O27  1  0.932  0.180  0.362  1.0
[/CIF]
.