The crystal structure described by KAs4(HO4)3 crystallizes in the triclinic P1 space group. K(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(7), one O(8), one O(9), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(10), one O(12), one O(3), one O(5), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one As(4)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, and  an edgeedge with one As(2)O6 octahedra. In the second As site, As(2) is bonded to one O(10), one O(11), one O(2), one O(4), one O(6), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one As(3)O4 tetrahedra, corners with two equivalent As(4)O4 tetrahedra, and  an edgeedge with one As(1)O6 octahedra. In the third As site, As(3) is bonded to one O(1), one O(11), one O(3), and one O(7) atom to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-66°. In the fourth As site, As(4) is bonded to one O(12), one O(2), one O(4), and one O(8) atom to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-63°. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. In the third H site, H(3) is bonded in a linear geometry to one O(7) and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one As(2) and one As(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one As(2) and one As(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(2), and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one K(1), one As(3), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(4), and one H(3) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one K(1), one As(1), and one As(2) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(1), one As(1), and one As(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(2), and one As(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(1), and one As(4) atom. is represented by the CIF file [CIF]
data_KAs4(HO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.249
_cell_length_b   7.185
_cell_length_c   7.796
_cell_angle_alpha   63.339
_cell_angle_beta   79.223
_cell_angle_gamma   84.472
_symmetry_Int_Tables_number   1
_cell_volume   258.074
_cell_formula_units_Z   1
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  0.002  0.995  0.001  1.0
  As  As1  1  0.404  0.880  0.429  1.0
  As  As2  1  0.595  0.124  0.569  1.0
  As  As3  1  0.839  0.686  0.680  1.0
  As  As4  1  0.154  0.325  0.311  1.0
  H  H5  1  0.508  0.660  0.284  1.0
  H  H6  1  0.492  0.339  0.719  1.0
  H  H7  1  0.971  0.494  0.982  1.0
  O  O8  1  0.114  0.710  0.507  1.0
  O  O9  1  0.889  0.284  0.499  1.0
  O  O10  1  0.580  0.630  0.602  1.0
  O  O11  1  0.418  0.369  0.395  1.0
  O  O12  1  0.512  0.814  0.231  1.0
  O  O13  1  0.486  0.185  0.771  1.0
  O  O14  1  0.878  0.462  0.887  1.0
  O  O15  1  0.098  0.535  0.108  1.0
  O  O16  1  0.309  0.962  0.626  1.0
  O  O17  1  0.697  0.034  0.378  1.0
  O  O18  1  0.771  0.888  0.746  1.0
  O  O19  1  0.229  0.111  0.258  1.0
[/CIF]
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The crystal structure described by KAs4(HO4)3 crystallizes in the triclinic P1 space group. K(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(7), one O(8), one O(9), two equivalent O(5), and two equivalent O(6) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(10), one O(12), one O(3), one O(5), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one As(4)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, and  an edgeedge with one As(2)O6 octahedra. In the second As site, As(2) is bonded to one O(10), one O(11), one O(2), one O(4), one O(6), and one O(9) atom to form AsO6 octahedra that share  a cornercorner with one As(3)O4 tetrahedra, corners with two equivalent As(4)O4 tetrahedra, and  an edgeedge with one As(1)O6 octahedra. In the third As site, As(3) is bonded to one O(1), one O(11), one O(3), and one O(7) atom to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-66°. In the fourth As site, As(4) is bonded to one O(12), one O(2), one O(4), and one O(8) atom to form corner-sharing AsO4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-63°. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(6) atom. In the third H site, H(3) is bonded in a linear geometry to one O(7) and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one As(2) and one As(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one As(2) and one As(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(1), and one H(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1), one As(2), and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one K(1), one As(3), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(4), and one H(3) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one K(1), one As(1), and one As(2) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one K(1), one As(1), and one As(2) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(2), and one As(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one K(1), one As(1), and one As(4) atom. is represented by the CIF file [CIF]
data_KAs4(HO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.249
_cell_length_b   7.185
_cell_length_c   7.796
_cell_angle_alpha   63.339
_cell_angle_beta   79.223
_cell_angle_gamma   84.472
_symmetry_Int_Tables_number   1
_cell_volume   258.074
_cell_formula_units_Z   1
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  0.002  0.995  0.001  1.0
  As  As1  1  0.404  0.880  0.429  1.0
  As  As2  1  0.595  0.124  0.569  1.0
  As  As3  1  0.839  0.686  0.680  1.0
  As  As4  1  0.154  0.325  0.311  1.0
  H  H5  1  0.508  0.660  0.284  1.0
  H  H6  1  0.492  0.339  0.719  1.0
  H  H7  1  0.971  0.494  0.982  1.0
  O  O8  1  0.114  0.710  0.507  1.0
  O  O9  1  0.889  0.284  0.499  1.0
  O  O10  1  0.580  0.630  0.602  1.0
  O  O11  1  0.418  0.369  0.395  1.0
  O  O12  1  0.512  0.814  0.231  1.0
  O  O13  1  0.486  0.185  0.771  1.0
  O  O14  1  0.878  0.462  0.887  1.0
  O  O15  1  0.098  0.535  0.108  1.0
  O  O16  1  0.309  0.962  0.626  1.0
  O  O17  1  0.697  0.034  0.378  1.0
  O  O18  1  0.771  0.888  0.746  1.0
  O  O19  1  0.229  0.111  0.258  1.0
[/CIF]
.