The compound described by K2Cr2AsHO10 crystallizes in the trigonal P3_221 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra. As(1) is bonded to two equivalent O(4) and two equivalent O(5) atoms to form AsO4 tetrahedra that share corners with two equivalent Cr(1)O4 tetrahedra. H(1) is bonded in a linear geometry to two equivalent O(5) atoms. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(2), one Cr(1), and one As(1) atom. In the second O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(2), one As(1), and one H(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(1) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Cr2AsHO10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.923
_cell_length_b   7.923
_cell_length_c   14.782
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   803.671
_cell_formula_units_Z   3
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
  K  K0  1  0.553  0.000  0.667  1.0
  K  K1  1  0.000  0.553  0.333  1.0
  K  K2  1  0.447  0.447  0.000  1.0
  K  K3  1  0.384  0.384  0.500  1.0
  K  K4  1  0.616  0.000  0.167  1.0
  K  K5  1  0.000  0.616  0.833  1.0
  Cr  Cr6  1  0.574  0.992  0.412  1.0
  Cr  Cr7  1  0.008  0.582  0.079  1.0
  Cr  Cr8  1  0.418  0.426  0.746  1.0
  Cr  Cr9  1  0.992  0.574  0.588  1.0
  Cr  Cr10  1  0.582  0.008  0.921  1.0
  Cr  Cr11  1  0.426  0.418  0.254  1.0
  As  As12  1  0.879  0.879  0.500  1.0
  As  As13  1  0.121  0.000  0.167  1.0
  As  As14  1  0.000  0.121  0.833  1.0
  H  H15  1  0.952  0.000  0.667  1.0
  H  H16  1  0.000  0.952  0.333  1.0
  H  H17  1  0.048  0.048  0.000  1.0
  O  O18  1  0.393  0.854  0.346  1.0
  O  O19  1  0.146  0.539  0.013  1.0
  O  O20  1  0.461  0.607  0.679  1.0
  O  O21  1  0.854  0.393  0.654  1.0
  O  O22  1  0.539  0.146  0.987  1.0
  O  O23  1  0.607  0.461  0.321  1.0
  O  O24  1  0.513  0.103  0.486  1.0
  O  O25  1  0.897  0.410  0.153  1.0
  O  O26  1  0.590  0.487  0.820  1.0
  O  O27  1  0.103  0.513  0.514  1.0
  O  O28  1  0.410  0.897  0.847  1.0
  O  O29  1  0.487  0.590  0.180  1.0
  O  O30  1  0.755  0.148  0.351  1.0
  O  O31  1  0.852  0.607  0.018  1.0
  O  O32  1  0.393  0.245  0.684  1.0
  O  O33  1  0.148  0.755  0.649  1.0
  O  O34  1  0.607  0.852  0.982  1.0
  O  O35  1  0.245  0.393  0.316  1.0
  O  O36  1  0.643  0.830  0.473  1.0
  O  O37  1  0.170  0.813  0.140  1.0
  O  O38  1  0.187  0.357  0.807  1.0
  O  O39  1  0.830  0.643  0.527  1.0
  O  O40  1  0.813  0.170  0.860  1.0
  O  O41  1  0.357  0.187  0.193  1.0
  O  O42  1  0.040  0.967  0.413  1.0
  O  O43  1  0.033  0.073  0.080  1.0
  O  O44  1  0.927  0.960  0.746  1.0
  O  O45  1  0.967  0.040  0.587  1.0
  O  O46  1  0.073  0.033  0.920  1.0
  O  O47  1  0.960  0.927  0.254  1.0
[/CIF]
.
The compound described by K2Cr2AsHO10 crystallizes in the trigonal P3_221 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra. As(1) is bonded to two equivalent O(4) and two equivalent O(5) atoms to form AsO4 tetrahedra that share corners with two equivalent Cr(1)O4 tetrahedra. H(1) is bonded in a linear geometry to two equivalent O(5) atoms. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(2), one Cr(1), and one As(1) atom. In the second O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(2), one As(1), and one H(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(1) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Cr2AsHO10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.923
_cell_length_b   7.923
_cell_length_c   14.782
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   803.671
_cell_formula_units_Z   3
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
  K  K0  1  0.553  0.000  0.667  1.0
  K  K1  1  0.000  0.553  0.333  1.0
  K  K2  1  0.447  0.447  0.000  1.0
  K  K3  1  0.384  0.384  0.500  1.0
  K  K4  1  0.616  0.000  0.167  1.0
  K  K5  1  0.000  0.616  0.833  1.0
  Cr  Cr6  1  0.574  0.992  0.412  1.0
  Cr  Cr7  1  0.008  0.582  0.079  1.0
  Cr  Cr8  1  0.418  0.426  0.746  1.0
  Cr  Cr9  1  0.992  0.574  0.588  1.0
  Cr  Cr10  1  0.582  0.008  0.921  1.0
  Cr  Cr11  1  0.426  0.418  0.254  1.0
  As  As12  1  0.879  0.879  0.500  1.0
  As  As13  1  0.121  0.000  0.167  1.0
  As  As14  1  0.000  0.121  0.833  1.0
  H  H15  1  0.952  0.000  0.667  1.0
  H  H16  1  0.000  0.952  0.333  1.0
  H  H17  1  0.048  0.048  0.000  1.0
  O  O18  1  0.393  0.854  0.346  1.0
  O  O19  1  0.146  0.539  0.013  1.0
  O  O20  1  0.461  0.607  0.679  1.0
  O  O21  1  0.854  0.393  0.654  1.0
  O  O22  1  0.539  0.146  0.987  1.0
  O  O23  1  0.607  0.461  0.321  1.0
  O  O24  1  0.513  0.103  0.486  1.0
  O  O25  1  0.897  0.410  0.153  1.0
  O  O26  1  0.590  0.487  0.820  1.0
  O  O27  1  0.103  0.513  0.514  1.0
  O  O28  1  0.410  0.897  0.847  1.0
  O  O29  1  0.487  0.590  0.180  1.0
  O  O30  1  0.755  0.148  0.351  1.0
  O  O31  1  0.852  0.607  0.018  1.0
  O  O32  1  0.393  0.245  0.684  1.0
  O  O33  1  0.148  0.755  0.649  1.0
  O  O34  1  0.607  0.852  0.982  1.0
  O  O35  1  0.245  0.393  0.316  1.0
  O  O36  1  0.643  0.830  0.473  1.0
  O  O37  1  0.170  0.813  0.140  1.0
  O  O38  1  0.187  0.357  0.807  1.0
  O  O39  1  0.830  0.643  0.527  1.0
  O  O40  1  0.813  0.170  0.860  1.0
  O  O41  1  0.357  0.187  0.193  1.0
  O  O42  1  0.040  0.967  0.413  1.0
  O  O43  1  0.033  0.073  0.080  1.0
  O  O44  1  0.927  0.960  0.746  1.0
  O  O45  1  0.967  0.040  0.587  1.0
  O  O46  1  0.073  0.033  0.920  1.0
  O  O47  1  0.960  0.927  0.254  1.0
[/CIF]
.