The structure described by Zn3(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted ZnO5 trigonal bipyramids that share  a cornercorner with one Zn(2)O6 octahedra, corners with three equivalent As(1)O4 tetrahedra,  an edgeedge with one Zn(2)O6 octahedra,  an edgeedge with one As(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 57°. In the second Zn site, Zn(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form ZnO6 octahedra that share corners with six equivalent As(1)O4 tetrahedra, corners with two equivalent Zn(1)O5 trigonal bipyramids, and edges with two equivalent Zn(1)O5 trigonal bipyramids. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent Zn(2)O6 octahedra, corners with three equivalent Zn(1)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 40-56°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Zn(1), one Zn(2), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. is represented by the CIF card [CIF]
data_Zn3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.480
_cell_length_b   5.294
_cell_length_c   8.857
_cell_angle_alpha   60.283
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   345.344
_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
  Zn  Zn0  1  0.139  0.480  0.112  1.0
  Zn  Zn1  1  0.639  0.520  0.388  1.0
  Zn  Zn2  1  0.861  0.520  0.888  1.0
  Zn  Zn3  1  0.361  0.480  0.612  1.0
  Zn  Zn4  1  0.000  0.500  0.500  1.0
  Zn  Zn5  1  0.500  0.500  0.000  1.0
  As  As6  1  0.307  0.854  0.192  1.0
  As  As7  1  0.807  0.146  0.308  1.0
  As  As8  1  0.693  0.146  0.808  1.0
  As  As9  1  0.193  0.854  0.692  1.0
  O  O10  1  0.067  0.711  0.863  1.0
  O  O11  1  0.567  0.289  0.637  1.0
  O  O12  1  0.933  0.289  0.137  1.0
  O  O13  1  0.433  0.711  0.363  1.0
  O  O14  1  0.198  0.217  0.616  1.0
  O  O15  1  0.698  0.783  0.884  1.0
  O  O16  1  0.802  0.783  0.384  1.0
  O  O17  1  0.302  0.217  0.116  1.0
  O  O18  1  0.136  0.782  0.534  1.0
  O  O19  1  0.636  0.218  0.966  1.0
  O  O20  1  0.129  0.677  0.253  1.0
  O  O21  1  0.629  0.323  0.247  1.0
  O  O22  1  0.871  0.323  0.747  1.0
  O  O23  1  0.371  0.677  0.753  1.0
  O  O24  1  0.364  0.782  0.034  1.0
  O  O25  1  0.864  0.218  0.466  1.0
[/CIF]
.
The structure described by Zn3(AsO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted ZnO5 trigonal bipyramids that share  a cornercorner with one Zn(2)O6 octahedra, corners with three equivalent As(1)O4 tetrahedra,  an edgeedge with one Zn(2)O6 octahedra,  an edgeedge with one As(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 57°. In the second Zn site, Zn(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form ZnO6 octahedra that share corners with six equivalent As(1)O4 tetrahedra, corners with two equivalent Zn(1)O5 trigonal bipyramids, and edges with two equivalent Zn(1)O5 trigonal bipyramids. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent Zn(2)O6 octahedra, corners with three equivalent Zn(1)O5 trigonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 40-56°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Zn(1), one Zn(2), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. is represented by the CIF card [CIF]
data_Zn3(AsO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.480
_cell_length_b   5.294
_cell_length_c   8.857
_cell_angle_alpha   60.283
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   345.344
_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
  Zn  Zn0  1  0.139  0.480  0.112  1.0
  Zn  Zn1  1  0.639  0.520  0.388  1.0
  Zn  Zn2  1  0.861  0.520  0.888  1.0
  Zn  Zn3  1  0.361  0.480  0.612  1.0
  Zn  Zn4  1  0.000  0.500  0.500  1.0
  Zn  Zn5  1  0.500  0.500  0.000  1.0
  As  As6  1  0.307  0.854  0.192  1.0
  As  As7  1  0.807  0.146  0.308  1.0
  As  As8  1  0.693  0.146  0.808  1.0
  As  As9  1  0.193  0.854  0.692  1.0
  O  O10  1  0.067  0.711  0.863  1.0
  O  O11  1  0.567  0.289  0.637  1.0
  O  O12  1  0.933  0.289  0.137  1.0
  O  O13  1  0.433  0.711  0.363  1.0
  O  O14  1  0.198  0.217  0.616  1.0
  O  O15  1  0.698  0.783  0.884  1.0
  O  O16  1  0.802  0.783  0.384  1.0
  O  O17  1  0.302  0.217  0.116  1.0
  O  O18  1  0.136  0.782  0.534  1.0
  O  O19  1  0.636  0.218  0.966  1.0
  O  O20  1  0.129  0.677  0.253  1.0
  O  O21  1  0.629  0.323  0.247  1.0
  O  O22  1  0.871  0.323  0.747  1.0
  O  O23  1  0.371  0.677  0.753  1.0
  O  O24  1  0.364  0.782  0.034  1.0
  O  O25  1  0.864  0.218  0.466  1.0
[/CIF]
.