The material structure described by Zn3(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), one O(4), one O(7), and one O(8) atom to form ZnO5 trigonal bipyramids that share corners with two equivalent As(2)O4 tetrahedra, corners with three equivalent As(1)O4 tetrahedra,  a cornercorner with one Zn(2)O5 trigonal bipyramid,  a cornercorner with one Zn(3)O5 trigonal bipyramid, and  an edgeedge with one Zn(3)O5 trigonal bipyramid. In the second Zn site, Zn(2) is bonded to one O(4), one O(5), one O(6), and two equivalent O(3) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra,  a cornercorner with one Zn(1)O5 trigonal bipyramid,  an edgeedge with one Zn(2)O5 trigonal bipyramid, and  an edgeedge with one Zn(3)O5 trigonal bipyramid. In the third Zn site, Zn(3) is bonded to one O(1), one O(5), one O(6), one O(7), and one O(8) atom to form ZnO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra,  a cornercorner with one Zn(1)O5 trigonal bipyramid,  an edgeedge with one Zn(1)O5 trigonal bipyramid, and  an edgeedge with one Zn(2)O5 trigonal bipyramid. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form AsO4 tetrahedra that share corners with two equivalent Zn(2)O5 trigonal bipyramids, corners with two equivalent Zn(3)O5 trigonal bipyramids, and corners with three equivalent Zn(1)O5 trigonal bipyramids. In the second As site, As(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Zn(1)O5 trigonal bipyramids, corners with three equivalent Zn(2)O5 trigonal bipyramids, and corners with three equivalent Zn(3)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to one Zn(2), one Zn(3), and one As(2) atom. In the third O site, O(6) is bonded in a distorted trigonal planar geometry to one Zn(2), one Zn(3), and one As(1) atom. In the fourth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Zn(3), and one As(2) atom. In the fifth O site, O(8) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(3), and one As(1) atom. In the sixth O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(3), and one As(2) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one As(1) atom. In the eighth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Zn(2) and one As(2) atom. is represented by the CIF card [CIF]
data_Zn3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.619
_cell_length_b   8.827
_cell_length_c   10.945
_cell_angle_alpha   90.000
_cell_angle_beta   93.735
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   638.153
_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
  Zn  Zn0  1  0.244  0.146  0.634  1.0
  Zn  Zn1  1  0.756  0.646  0.866  1.0
  Zn  Zn2  1  0.756  0.854  0.366  1.0
  Zn  Zn3  1  0.244  0.354  0.134  1.0
  Zn  Zn4  1  0.619  0.022  0.885  1.0
  Zn  Zn5  1  0.381  0.522  0.615  1.0
  Zn  Zn6  1  0.381  0.978  0.115  1.0
  Zn  Zn7  1  0.619  0.478  0.385  1.0
  Zn  Zn8  1  0.918  0.285  0.922  1.0
  Zn  Zn9  1  0.082  0.785  0.578  1.0
  Zn  Zn10  1  0.082  0.715  0.078  1.0
  Zn  Zn11  1  0.918  0.215  0.422  1.0
  As  As12  1  0.417  0.130  0.365  1.0
  As  As13  1  0.583  0.630  0.135  1.0
  As  As14  1  0.583  0.870  0.635  1.0
  As  As15  1  0.417  0.370  0.865  1.0
  As  As16  1  0.893  0.061  0.147  1.0
  As  As17  1  0.107  0.561  0.353  1.0
  As  As18  1  0.107  0.939  0.853  1.0
  As  As19  1  0.893  0.439  0.647  1.0
  O  O20  1  0.874  0.453  0.802  1.0
  O  O21  1  0.126  0.953  0.698  1.0
  O  O22  1  0.126  0.547  0.198  1.0
  O  O23  1  0.874  0.047  0.302  1.0
  O  O24  1  0.478  0.554  0.858  1.0
  O  O25  1  0.522  0.054  0.642  1.0
  O  O26  1  0.522  0.446  0.142  1.0
  O  O27  1  0.478  0.946  0.358  1.0
  O  O28  1  0.673  0.503  0.577  1.0
  O  O29  1  0.327  0.003  0.923  1.0
  O  O30  1  0.327  0.497  0.423  1.0
  O  O31  1  0.673  0.997  0.077  1.0
  O  O32  1  0.336  0.333  0.715  1.0
  O  O33  1  0.664  0.833  0.785  1.0
  O  O34  1  0.664  0.667  0.285  1.0
  O  O35  1  0.336  0.167  0.215  1.0
  O  O36  1  0.078  0.566  0.619  1.0
  O  O37  1  0.922  0.066  0.881  1.0
  O  O38  1  0.922  0.434  0.381  1.0
  O  O39  1  0.078  0.934  0.119  1.0
  O  O40  1  0.609  0.251  0.407  1.0
  O  O41  1  0.391  0.751  0.093  1.0
  O  O42  1  0.391  0.749  0.593  1.0
  O  O43  1  0.609  0.249  0.907  1.0
  O  O44  1  0.949  0.241  0.107  1.0
  O  O45  1  0.051  0.741  0.393  1.0
  O  O46  1  0.051  0.759  0.893  1.0
  O  O47  1  0.949  0.259  0.607  1.0
  O  O48  1  0.216  0.158  0.453  1.0
  O  O49  1  0.784  0.658  0.047  1.0
  O  O50  1  0.784  0.842  0.547  1.0
  O  O51  1  0.216  0.342  0.953  1.0
[/CIF]
.
The material structure described by Zn3(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), one O(4), one O(7), and one O(8) atom to form ZnO5 trigonal bipyramids that share corners with two equivalent As(2)O4 tetrahedra, corners with three equivalent As(1)O4 tetrahedra,  a cornercorner with one Zn(2)O5 trigonal bipyramid,  a cornercorner with one Zn(3)O5 trigonal bipyramid, and  an edgeedge with one Zn(3)O5 trigonal bipyramid. In the second Zn site, Zn(2) is bonded to one O(4), one O(5), one O(6), and two equivalent O(3) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra,  a cornercorner with one Zn(1)O5 trigonal bipyramid,  an edgeedge with one Zn(2)O5 trigonal bipyramid, and  an edgeedge with one Zn(3)O5 trigonal bipyramid. In the third Zn site, Zn(3) is bonded to one O(1), one O(5), one O(6), one O(7), and one O(8) atom to form ZnO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra, corners with three equivalent As(2)O4 tetrahedra,  a cornercorner with one Zn(1)O5 trigonal bipyramid,  an edgeedge with one Zn(1)O5 trigonal bipyramid, and  an edgeedge with one Zn(2)O5 trigonal bipyramid. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form AsO4 tetrahedra that share corners with two equivalent Zn(2)O5 trigonal bipyramids, corners with two equivalent Zn(3)O5 trigonal bipyramids, and corners with three equivalent Zn(1)O5 trigonal bipyramids. In the second As site, As(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form AsO4 tetrahedra that share corners with two equivalent Zn(1)O5 trigonal bipyramids, corners with three equivalent Zn(2)O5 trigonal bipyramids, and corners with three equivalent Zn(3)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. In the second O site, O(5) is bonded in a distorted trigonal planar geometry to one Zn(2), one Zn(3), and one As(2) atom. In the third O site, O(6) is bonded in a distorted trigonal planar geometry to one Zn(2), one Zn(3), and one As(1) atom. In the fourth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Zn(3), and one As(2) atom. In the fifth O site, O(8) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(3), and one As(1) atom. In the sixth O site, O(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(3), and one As(2) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one As(1) atom. In the eighth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Zn(2) and one As(2) atom. is represented by the CIF card [CIF]
data_Zn3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.619
_cell_length_b   8.827
_cell_length_c   10.945
_cell_angle_alpha   90.000
_cell_angle_beta   93.735
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   638.153
_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
  Zn  Zn0  1  0.244  0.146  0.634  1.0
  Zn  Zn1  1  0.756  0.646  0.866  1.0
  Zn  Zn2  1  0.756  0.854  0.366  1.0
  Zn  Zn3  1  0.244  0.354  0.134  1.0
  Zn  Zn4  1  0.619  0.022  0.885  1.0
  Zn  Zn5  1  0.381  0.522  0.615  1.0
  Zn  Zn6  1  0.381  0.978  0.115  1.0
  Zn  Zn7  1  0.619  0.478  0.385  1.0
  Zn  Zn8  1  0.918  0.285  0.922  1.0
  Zn  Zn9  1  0.082  0.785  0.578  1.0
  Zn  Zn10  1  0.082  0.715  0.078  1.0
  Zn  Zn11  1  0.918  0.215  0.422  1.0
  As  As12  1  0.417  0.130  0.365  1.0
  As  As13  1  0.583  0.630  0.135  1.0
  As  As14  1  0.583  0.870  0.635  1.0
  As  As15  1  0.417  0.370  0.865  1.0
  As  As16  1  0.893  0.061  0.147  1.0
  As  As17  1  0.107  0.561  0.353  1.0
  As  As18  1  0.107  0.939  0.853  1.0
  As  As19  1  0.893  0.439  0.647  1.0
  O  O20  1  0.874  0.453  0.802  1.0
  O  O21  1  0.126  0.953  0.698  1.0
  O  O22  1  0.126  0.547  0.198  1.0
  O  O23  1  0.874  0.047  0.302  1.0
  O  O24  1  0.478  0.554  0.858  1.0
  O  O25  1  0.522  0.054  0.642  1.0
  O  O26  1  0.522  0.446  0.142  1.0
  O  O27  1  0.478  0.946  0.358  1.0
  O  O28  1  0.673  0.503  0.577  1.0
  O  O29  1  0.327  0.003  0.923  1.0
  O  O30  1  0.327  0.497  0.423  1.0
  O  O31  1  0.673  0.997  0.077  1.0
  O  O32  1  0.336  0.333  0.715  1.0
  O  O33  1  0.664  0.833  0.785  1.0
  O  O34  1  0.664  0.667  0.285  1.0
  O  O35  1  0.336  0.167  0.215  1.0
  O  O36  1  0.078  0.566  0.619  1.0
  O  O37  1  0.922  0.066  0.881  1.0
  O  O38  1  0.922  0.434  0.381  1.0
  O  O39  1  0.078  0.934  0.119  1.0
  O  O40  1  0.609  0.251  0.407  1.0
  O  O41  1  0.391  0.751  0.093  1.0
  O  O42  1  0.391  0.749  0.593  1.0
  O  O43  1  0.609  0.249  0.907  1.0
  O  O44  1  0.949  0.241  0.107  1.0
  O  O45  1  0.051  0.741  0.393  1.0
  O  O46  1  0.051  0.759  0.893  1.0
  O  O47  1  0.949  0.259  0.607  1.0
  O  O48  1  0.216  0.158  0.453  1.0
  O  O49  1  0.784  0.658  0.047  1.0
  O  O50  1  0.784  0.842  0.547  1.0
  O  O51  1  0.216  0.342  0.953  1.0
[/CIF]
.