The structure described by K2FeAlB2P4(HO9)2 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(14), one O(17), one O(5), one O(7), one O(8), one O(9), and two equivalent O(3) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(10), one O(12), one O(13), one O(18), one O(6), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. Fe(1) is bonded to one O(10), one O(16), one O(18), one O(4), one O(5), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one B(2)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. Al(1) is bonded to one O(15), one O(17), one O(3), one O(6), one O(7), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one B(1)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(11), one O(14), and one O(15) atom to form BO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the second B site, B(2) is bonded to one O(12), one O(13), one O(16), and one O(2) atom to form BO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(18), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, and  a cornercorner with one B(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 30-45°. In the second P site, P(2) is bonded to one O(12), one O(17), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, and  a cornercorner with one B(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-45°. In the third P site, P(3) is bonded to one O(1), one O(13), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one B(1)O4 tetrahedra, and  a cornercorner with one B(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-53°. In the fourth P site, P(4) is bonded to one O(10), one O(14), one O(2), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one B(1)O4 tetrahedra, and  a cornercorner with one B(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-57°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(15) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(16) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(1) and one P(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one B(2) and one P(4) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent K(1), one Al(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(2), one Fe(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Fe(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one K(2), one Al(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Al(1), and one P(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Fe(1), and one P(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one K(1), one K(2), one Al(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one K(1), one K(2), one Fe(1), and one P(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one K(1), one B(1), and one P(1) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one K(2), one B(2), and one P(2) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one K(2), one B(2), and one P(3) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one K(1), one B(1), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Al(1), one B(1), and one H(1) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Fe(1), one B(2), and one H(2) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one K(1), one Al(1), and one P(2) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one K(2), one Fe(1), and one P(1) atom. is represented by the CIF card [CIF]
data_K2AlFeB2P4(HO9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.169
_cell_length_b   8.206
_cell_length_c   8.344
_cell_angle_alpha   86.308
_cell_angle_beta   80.683
_cell_angle_gamma   86.519
_symmetry_Int_Tables_number   1
_cell_volume   348.109
_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  0.277  0.173  0.382  1.0
  K  K1  1  0.725  0.826  0.617  1.0
  Al  Al2  1  0.733  0.303  0.692  1.0
  Fe  Fe3  1  0.268  0.694  0.310  1.0
  B  B4  1  0.878  0.233  0.053  1.0
  B  B5  1  0.124  0.769  0.944  1.0
  P  P6  1  0.780  0.436  0.317  1.0
  P  P7  1  0.215  0.555  0.690  1.0
  P  P8  1  0.202  0.089  0.801  1.0
  P  P9  1  0.801  0.919  0.196  1.0
  H  H10  1  0.551  0.358  0.985  1.0
  H  H11  1  0.452  0.640  0.007  1.0
  O  O12  1  0.132  0.174  0.966  1.0
  O  O13  1  0.873  0.828  0.034  1.0
  O  O14  1  0.753  0.306  0.461  1.0
  O  O15  1  0.252  0.689  0.550  1.0
  O  O16  1  0.505  0.491  0.277  1.0
  O  O17  1  0.488  0.488  0.723  1.0
  O  O18  1  0.971  0.110  0.705  1.0
  O  O19  1  0.031  0.906  0.293  1.0
  O  O20  1  0.458  0.153  0.707  1.0
  O  O21  1  0.551  0.855  0.298  1.0
  O  O22  1  0.940  0.352  0.164  1.0
  O  O23  1  0.061  0.644  0.841  1.0
  O  O24  1  0.265  0.902  0.839  1.0
  O  O25  1  0.728  0.102  0.151  1.0
  O  O26  1  0.715  0.306  0.933  1.0
  O  O27  1  0.295  0.699  0.059  1.0
  O  O28  1  0.039  0.423  0.659  1.0
  O  O29  1  0.936  0.579  0.347  1.0
[/CIF]
.
The structure described by K2FeAlB2P4(HO9)2 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(14), one O(17), one O(5), one O(7), one O(8), one O(9), and two equivalent O(3) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to one O(10), one O(12), one O(13), one O(18), one O(6), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. Fe(1) is bonded to one O(10), one O(16), one O(18), one O(4), one O(5), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one B(2)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. Al(1) is bonded to one O(15), one O(17), one O(3), one O(6), one O(7), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one B(1)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(11), one O(14), and one O(15) atom to form BO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the second B site, B(2) is bonded to one O(12), one O(13), one O(16), and one O(2) atom to form BO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(18), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, and  a cornercorner with one B(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 30-45°. In the second P site, P(2) is bonded to one O(12), one O(17), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, and  a cornercorner with one B(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-45°. In the third P site, P(3) is bonded to one O(1), one O(13), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one B(1)O4 tetrahedra, and  a cornercorner with one B(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-53°. In the fourth P site, P(4) is bonded to one O(10), one O(14), one O(2), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one B(1)O4 tetrahedra, and  a cornercorner with one B(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-57°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(15) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(16) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one B(1) and one P(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one B(2) and one P(4) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to two equivalent K(1), one Al(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(2), one Fe(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Fe(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one K(2), one Al(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Al(1), and one P(3) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Fe(1), and one P(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one K(1), one K(2), one Al(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one K(1), one K(2), one Fe(1), and one P(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one K(1), one B(1), and one P(1) atom. In the twelfth O site, O(12) is bonded in a 2-coordinate geometry to one K(2), one B(2), and one P(2) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one K(2), one B(2), and one P(3) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one K(1), one B(1), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Al(1), one B(1), and one H(1) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Fe(1), one B(2), and one H(2) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one K(1), one Al(1), and one P(2) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one K(2), one Fe(1), and one P(1) atom. is represented by the CIF card [CIF]
data_K2AlFeB2P4(HO9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.169
_cell_length_b   8.206
_cell_length_c   8.344
_cell_angle_alpha   86.308
_cell_angle_beta   80.683
_cell_angle_gamma   86.519
_symmetry_Int_Tables_number   1
_cell_volume   348.109
_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  0.277  0.173  0.382  1.0
  K  K1  1  0.725  0.826  0.617  1.0
  Al  Al2  1  0.733  0.303  0.692  1.0
  Fe  Fe3  1  0.268  0.694  0.310  1.0
  B  B4  1  0.878  0.233  0.053  1.0
  B  B5  1  0.124  0.769  0.944  1.0
  P  P6  1  0.780  0.436  0.317  1.0
  P  P7  1  0.215  0.555  0.690  1.0
  P  P8  1  0.202  0.089  0.801  1.0
  P  P9  1  0.801  0.919  0.196  1.0
  H  H10  1  0.551  0.358  0.985  1.0
  H  H11  1  0.452  0.640  0.007  1.0
  O  O12  1  0.132  0.174  0.966  1.0
  O  O13  1  0.873  0.828  0.034  1.0
  O  O14  1  0.753  0.306  0.461  1.0
  O  O15  1  0.252  0.689  0.550  1.0
  O  O16  1  0.505  0.491  0.277  1.0
  O  O17  1  0.488  0.488  0.723  1.0
  O  O18  1  0.971  0.110  0.705  1.0
  O  O19  1  0.031  0.906  0.293  1.0
  O  O20  1  0.458  0.153  0.707  1.0
  O  O21  1  0.551  0.855  0.298  1.0
  O  O22  1  0.940  0.352  0.164  1.0
  O  O23  1  0.061  0.644  0.841  1.0
  O  O24  1  0.265  0.902  0.839  1.0
  O  O25  1  0.728  0.102  0.151  1.0
  O  O26  1  0.715  0.306  0.933  1.0
  O  O27  1  0.295  0.699  0.059  1.0
  O  O28  1  0.039  0.423  0.659  1.0
  O  O29  1  0.936  0.579  0.347  1.0
[/CIF]
.