The compound described by Cu2PO4 crystallizes in the triclinic P-1 space group. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(2), one O(6), and two equivalent O(3) atoms to form distorted CuO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with four equivalent P(2)O4 tetrahedra, and  an edgeedge with one Cu(1)O5 trigonal bipyramid. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(7), and one O(8) atom. In the third Cu site, Cu(3) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(7) atom. In the fourth Cu site, Cu(4) is bonded in a distorted T-shaped geometry to one O(5), one O(6), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Cu(1)O5 trigonal bipyramid. In the second P site, P(2) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with four equivalent Cu(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Cu(1), one Cu(2), and one P(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Cu(1), one Cu(2), one Cu(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cu(2), one Cu(3), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cu(4) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(4), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cu(2), one Cu(3), and one P(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Cu(2), one Cu(4), and one P(1) atom. is represented by the CIF file [CIF]
data_Cu2PO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.996
_cell_length_b   6.193
_cell_length_c   9.234
_cell_angle_alpha   73.983
_cell_angle_beta   84.150
_cell_angle_gamma   79.676
_symmetry_Int_Tables_number   1
_cell_volume   323.751
_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
  Cu  Cu0  1  0.808  0.672  0.030  1.0
  Cu  Cu1  1  0.192  0.328  0.970  1.0
  Cu  Cu2  1  0.975  0.883  0.272  1.0
  Cu  Cu3  1  0.025  0.117  0.728  1.0
  Cu  Cu4  1  0.451  0.616  0.366  1.0
  Cu  Cu5  1  0.549  0.384  0.634  1.0
  Cu  Cu6  1  0.565  0.812  0.654  1.0
  Cu  Cu7  1  0.435  0.188  0.346  1.0
  P  P8  1  0.121  0.699  0.617  1.0
  P  P9  1  0.879  0.301  0.383  1.0
  P  P10  1  0.291  0.805  0.001  1.0
  P  P11  1  0.709  0.195  0.999  1.0
  O  O12  1  0.805  0.950  0.091  1.0
  O  O13  1  0.195  0.050  0.909  1.0
  O  O14  1  0.759  0.539  0.299  1.0
  O  O15  1  0.241  0.461  0.701  1.0
  O  O16  1  0.134  0.646  0.978  1.0
  O  O17  1  0.866  0.354  0.022  1.0
  O  O18  1  0.151  0.713  0.446  1.0
  O  O19  1  0.849  0.287  0.554  1.0
  O  O20  1  0.876  0.744  0.671  1.0
  O  O21  1  0.124  0.256  0.329  1.0
  O  O22  1  0.527  0.739  0.937  1.0
  O  O23  1  0.473  0.261  0.063  1.0
  O  O24  1  0.279  0.801  0.168  1.0
  O  O25  1  0.721  0.199  0.832  1.0
  O  O26  1  0.245  0.885  0.646  1.0
  O  O27  1  0.755  0.115  0.354  1.0
[/CIF]
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The compound described by Cu2PO4 crystallizes in the triclinic P-1 space group. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(2), one O(6), and two equivalent O(3) atoms to form distorted CuO5 trigonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with four equivalent P(2)O4 tetrahedra, and  an edgeedge with one Cu(1)O5 trigonal bipyramid. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(7), and one O(8) atom. In the third Cu site, Cu(3) is bonded in a 3-coordinate geometry to one O(2), one O(4), and one O(7) atom. In the fourth Cu site, Cu(4) is bonded in a distorted T-shaped geometry to one O(5), one O(6), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Cu(1)O5 trigonal bipyramid. In the second P site, P(2) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with four equivalent Cu(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Cu(1), one Cu(2), and one P(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Cu(1), one Cu(2), one Cu(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cu(2), one Cu(3), and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cu(4) and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(4), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cu(2), one Cu(3), and one P(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Cu(2), one Cu(4), and one P(1) atom. is represented by the CIF file [CIF]
data_Cu2PO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.996
_cell_length_b   6.193
_cell_length_c   9.234
_cell_angle_alpha   73.983
_cell_angle_beta   84.150
_cell_angle_gamma   79.676
_symmetry_Int_Tables_number   1
_cell_volume   323.751
_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
  Cu  Cu0  1  0.808  0.672  0.030  1.0
  Cu  Cu1  1  0.192  0.328  0.970  1.0
  Cu  Cu2  1  0.975  0.883  0.272  1.0
  Cu  Cu3  1  0.025  0.117  0.728  1.0
  Cu  Cu4  1  0.451  0.616  0.366  1.0
  Cu  Cu5  1  0.549  0.384  0.634  1.0
  Cu  Cu6  1  0.565  0.812  0.654  1.0
  Cu  Cu7  1  0.435  0.188  0.346  1.0
  P  P8  1  0.121  0.699  0.617  1.0
  P  P9  1  0.879  0.301  0.383  1.0
  P  P10  1  0.291  0.805  0.001  1.0
  P  P11  1  0.709  0.195  0.999  1.0
  O  O12  1  0.805  0.950  0.091  1.0
  O  O13  1  0.195  0.050  0.909  1.0
  O  O14  1  0.759  0.539  0.299  1.0
  O  O15  1  0.241  0.461  0.701  1.0
  O  O16  1  0.134  0.646  0.978  1.0
  O  O17  1  0.866  0.354  0.022  1.0
  O  O18  1  0.151  0.713  0.446  1.0
  O  O19  1  0.849  0.287  0.554  1.0
  O  O20  1  0.876  0.744  0.671  1.0
  O  O21  1  0.124  0.256  0.329  1.0
  O  O22  1  0.527  0.739  0.937  1.0
  O  O23  1  0.473  0.261  0.063  1.0
  O  O24  1  0.279  0.801  0.168  1.0
  O  O25  1  0.721  0.199  0.832  1.0
  O  O26  1  0.245  0.885  0.646  1.0
  O  O27  1  0.755  0.115  0.354  1.0
[/CIF]
.