The compound described by Ca2Zn4As4O17 crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(2), one O(6), one O(7), and one O(8) atom to form distorted ZnO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(4), one O(5), and two equivalent O(3) atoms to form ZnO5 trigonal bipyramids that share  a cornercorner with one As(2)O4 tetrahedra, corners with four equivalent As(1)O4 tetrahedra, 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(1), one O(3), one O(5), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and corners with four equivalent Zn(2)O5 trigonal bipyramids. In the second As site, As(2) 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 three equivalent Zn(1)O4 tetrahedra and  a cornercorner with one Zn(2)O5 trigonal bipyramid. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a distorted trigonal planar geometry to one Ca(1), one Zn(1), and one As(1) atom. In the second O site, O(8) is bonded in a distorted trigonal planar geometry to one Ca(1), one Zn(1), and one As(2) atom. In the third O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Zn(2), and one As(1) atom. In the fourth O site, O(9) is bonded in a bent 150 degrees geometry to two equivalent Ca(1) atoms. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Zn(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ca(1), one Zn(1), and one As(2) atom. In the seventh O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Zn(2) and one As(1) atom. In the eighth O site, O(4) is bonded in a 3-coordinate geometry to one Ca(1), one Zn(2), and one As(2) atom. In the ninth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Zn(2), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca2Zn4As4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.651
_cell_length_b   10.651
_cell_length_c   9.960
_cell_angle_alpha   78.503
_cell_angle_beta   78.503
_cell_angle_gamma   43.008
_symmetry_Int_Tables_number   1
_cell_volume   752.814
_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
  Ca  Ca0  1  0.159  0.638  0.406  1.0
  Ca  Ca1  1  0.362  0.841  0.094  1.0
  Ca  Ca2  1  0.841  0.362  0.594  1.0
  Ca  Ca3  1  0.638  0.159  0.906  1.0
  Zn  Zn4  1  0.998  0.189  0.298  1.0
  Zn  Zn5  1  0.811  0.002  0.202  1.0
  Zn  Zn6  1  0.002  0.811  0.702  1.0
  Zn  Zn7  1  0.189  0.998  0.798  1.0
  Zn  Zn8  1  0.786  0.639  0.012  1.0
  Zn  Zn9  1  0.361  0.213  0.488  1.0
  Zn  Zn10  1  0.213  0.361  0.988  1.0
  Zn  Zn11  1  0.639  0.786  0.512  1.0
  As  As12  1  0.002  0.504  0.296  1.0
  As  As13  1  0.496  0.998  0.204  1.0
  As  As14  1  0.998  0.496  0.704  1.0
  As  As15  1  0.504  0.002  0.796  1.0
  As  As16  1  0.833  0.288  0.017  1.0
  As  As17  1  0.712  0.167  0.483  1.0
  As  As18  1  0.167  0.712  0.983  1.0
  As  As19  1  0.288  0.833  0.517  1.0
  O  O20  1  0.211  0.407  0.331  1.0
  O  O21  1  0.593  0.789  0.169  1.0
  O  O22  1  0.789  0.593  0.669  1.0
  O  O23  1  0.407  0.211  0.831  1.0
  O  O24  1  0.027  0.142  0.108  1.0
  O  O25  1  0.858  0.973  0.392  1.0
  O  O26  1  0.973  0.858  0.892  1.0
  O  O27  1  0.142  0.027  0.608  1.0
  O  O28  1  0.990  0.545  0.120  1.0
  O  O29  1  0.455  0.010  0.380  1.0
  O  O30  1  0.010  0.455  0.880  1.0
  O  O31  1  0.545  0.990  0.620  1.0
  O  O32  1  0.695  0.514  0.038  1.0
  O  O33  1  0.486  0.305  0.462  1.0
  O  O34  1  0.305  0.486  0.962  1.0
  O  O35  1  0.514  0.695  0.538  1.0
  O  O36  1  0.846  0.709  0.370  1.0
  O  O37  1  0.291  0.154  0.130  1.0
  O  O38  1  0.154  0.291  0.630  1.0
  O  O39  1  0.709  0.846  0.870  1.0
  O  O40  1  0.082  0.767  0.155  1.0
  O  O41  1  0.233  0.918  0.345  1.0
  O  O42  1  0.918  0.233  0.845  1.0
  O  O43  1  0.767  0.082  0.655  1.0
  O  O44  1  0.958  0.376  0.368  1.0
  O  O45  1  0.624  0.042  0.132  1.0
  O  O46  1  0.042  0.624  0.632  1.0
  O  O47  1  0.376  0.958  0.868  1.0
  O  O48  1  0.778  0.277  0.430  1.0
  O  O49  1  0.723  0.222  0.070  1.0
  O  O50  1  0.222  0.723  0.570  1.0
  O  O51  1  0.277  0.778  0.930  1.0
  O  O52  1  0.334  0.666  0.250  1.0
  O  O53  1  0.666  0.334  0.750  1.0
[/CIF]
.
The compound described by Ca2Zn4As4O17 crystallizes in the monoclinic C2/c space group. Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(2), one O(6), one O(7), and one O(8) atom to form distorted ZnO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. In the second Zn site, Zn(2) is bonded to one O(1), one O(4), one O(5), and two equivalent O(3) atoms to form ZnO5 trigonal bipyramids that share  a cornercorner with one As(2)O4 tetrahedra, corners with four equivalent As(1)O4 tetrahedra, 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(1), one O(3), one O(5), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and corners with four equivalent Zn(2)O5 trigonal bipyramids. In the second As site, As(2) 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 three equivalent Zn(1)O4 tetrahedra and  a cornercorner with one Zn(2)O5 trigonal bipyramid. There are nine inequivalent O sites. In the first O site, O(7) is bonded in a distorted trigonal planar geometry to one Ca(1), one Zn(1), and one As(1) atom. In the second O site, O(8) is bonded in a distorted trigonal planar geometry to one Ca(1), one Zn(1), and one As(2) atom. In the third O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1), one Zn(2), and one As(1) atom. In the fourth O site, O(9) is bonded in a bent 150 degrees geometry to two equivalent Ca(1) atoms. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Zn(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ca(1), one Zn(1), and one As(2) atom. In the seventh O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Zn(2) and one As(1) atom. In the eighth O site, O(4) is bonded in a 3-coordinate geometry to one Ca(1), one Zn(2), and one As(2) atom. In the ninth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Zn(2), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ca2Zn4As4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.651
_cell_length_b   10.651
_cell_length_c   9.960
_cell_angle_alpha   78.503
_cell_angle_beta   78.503
_cell_angle_gamma   43.008
_symmetry_Int_Tables_number   1
_cell_volume   752.814
_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
  Ca  Ca0  1  0.159  0.638  0.406  1.0
  Ca  Ca1  1  0.362  0.841  0.094  1.0
  Ca  Ca2  1  0.841  0.362  0.594  1.0
  Ca  Ca3  1  0.638  0.159  0.906  1.0
  Zn  Zn4  1  0.998  0.189  0.298  1.0
  Zn  Zn5  1  0.811  0.002  0.202  1.0
  Zn  Zn6  1  0.002  0.811  0.702  1.0
  Zn  Zn7  1  0.189  0.998  0.798  1.0
  Zn  Zn8  1  0.786  0.639  0.012  1.0
  Zn  Zn9  1  0.361  0.213  0.488  1.0
  Zn  Zn10  1  0.213  0.361  0.988  1.0
  Zn  Zn11  1  0.639  0.786  0.512  1.0
  As  As12  1  0.002  0.504  0.296  1.0
  As  As13  1  0.496  0.998  0.204  1.0
  As  As14  1  0.998  0.496  0.704  1.0
  As  As15  1  0.504  0.002  0.796  1.0
  As  As16  1  0.833  0.288  0.017  1.0
  As  As17  1  0.712  0.167  0.483  1.0
  As  As18  1  0.167  0.712  0.983  1.0
  As  As19  1  0.288  0.833  0.517  1.0
  O  O20  1  0.211  0.407  0.331  1.0
  O  O21  1  0.593  0.789  0.169  1.0
  O  O22  1  0.789  0.593  0.669  1.0
  O  O23  1  0.407  0.211  0.831  1.0
  O  O24  1  0.027  0.142  0.108  1.0
  O  O25  1  0.858  0.973  0.392  1.0
  O  O26  1  0.973  0.858  0.892  1.0
  O  O27  1  0.142  0.027  0.608  1.0
  O  O28  1  0.990  0.545  0.120  1.0
  O  O29  1  0.455  0.010  0.380  1.0
  O  O30  1  0.010  0.455  0.880  1.0
  O  O31  1  0.545  0.990  0.620  1.0
  O  O32  1  0.695  0.514  0.038  1.0
  O  O33  1  0.486  0.305  0.462  1.0
  O  O34  1  0.305  0.486  0.962  1.0
  O  O35  1  0.514  0.695  0.538  1.0
  O  O36  1  0.846  0.709  0.370  1.0
  O  O37  1  0.291  0.154  0.130  1.0
  O  O38  1  0.154  0.291  0.630  1.0
  O  O39  1  0.709  0.846  0.870  1.0
  O  O40  1  0.082  0.767  0.155  1.0
  O  O41  1  0.233  0.918  0.345  1.0
  O  O42  1  0.918  0.233  0.845  1.0
  O  O43  1  0.767  0.082  0.655  1.0
  O  O44  1  0.958  0.376  0.368  1.0
  O  O45  1  0.624  0.042  0.132  1.0
  O  O46  1  0.042  0.624  0.632  1.0
  O  O47  1  0.376  0.958  0.868  1.0
  O  O48  1  0.778  0.277  0.430  1.0
  O  O49  1  0.723  0.222  0.070  1.0
  O  O50  1  0.222  0.723  0.570  1.0
  O  O51  1  0.277  0.778  0.930  1.0
  O  O52  1  0.334  0.666  0.250  1.0
  O  O53  1  0.666  0.334  0.750  1.0
[/CIF]
.