The material structure described by K3Cr4PO16 crystallizes in the monoclinic Cc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(16), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the third K site, K(3) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(15), one O(2), one O(4), one O(6), and one O(9) atom. There are four inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(10), one O(2), one O(4), and one O(7) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. In the second Cr site, Cr(2) is bonded to one O(11), one O(13), one O(16), and one O(9) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. In the third Cr site, Cr(3) is bonded to one O(1), one O(14), one O(5), and one O(8) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one O(12), one O(15), one O(3), and one O(6) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. P(1) is bonded to one O(12), one O(14), one O(16), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Cr(2)O4 tetrahedra,  a cornercorner with one Cr(3)O4 tetrahedra, and  a cornercorner with one Cr(4)O4 tetrahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one K(2), one K(3), and one Cr(3) atom. In the second O site, O(2) is bonded in a single-bond geometry to one K(1), one K(2), one K(3), and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one K(1) and one Cr(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one Cr(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one K(2), one Cr(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(3) and one Cr(2) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one K(1), one K(2), one K(3), and one Cr(1) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one Cr(2) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Cr(4) and one P(1) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one Cr(2) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Cr(3) and one P(1) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one K(3) and one Cr(4) atom. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to one K(2), one Cr(2), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K3Cr4PO16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.726
_cell_length_b   7.726
_cell_length_c   15.091
_cell_angle_alpha   80.079
_cell_angle_beta   80.079
_cell_angle_gamma   102.211
_symmetry_Int_Tables_number   1
_cell_volume   846.558
_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
  K  K0  1  0.749  0.678  0.828  1.0
  K  K1  1  0.678  0.749  0.328  1.0
  K  K2  1  0.197  0.177  0.338  1.0
  K  K3  1  0.177  0.197  0.838  1.0
  K  K4  1  0.868  0.419  0.110  1.0
  K  K5  1  0.419  0.868  0.610  1.0
  Cr  Cr6  1  0.207  0.681  0.858  1.0
  Cr  Cr7  1  0.398  0.277  0.068  1.0
  Cr  Cr8  1  0.720  0.177  0.737  1.0
  Cr  Cr9  1  0.767  0.892  0.041  1.0
  Cr  Cr10  1  0.277  0.398  0.568  1.0
  Cr  Cr11  1  0.177  0.720  0.237  1.0
  Cr  Cr12  1  0.681  0.207  0.358  1.0
  Cr  Cr13  1  0.892  0.767  0.541  1.0
  P  P14  1  0.352  0.888  0.017  1.0
  P  P15  1  0.888  0.352  0.517  1.0
  O  O16  1  0.518  0.043  0.764  1.0
  O  O17  1  0.506  0.040  0.410  1.0
  O  O18  1  0.843  0.903  0.460  1.0
  O  O19  1  0.609  0.378  0.312  1.0
  O  O20  1  0.719  0.359  0.777  1.0
  O  O21  1  0.378  0.609  0.812  1.0
  O  O22  1  0.744  0.751  0.138  1.0
  O  O23  1  0.821  0.272  0.440  1.0
  O  O24  1  0.903  0.843  0.960  1.0
  O  O25  1  0.040  0.506  0.910  1.0
  O  O26  1  0.751  0.744  0.638  1.0
  O  O27  1  0.075  0.863  0.278  1.0
  O  O28  1  0.351  0.218  0.590  1.0
  O  O29  1  0.807  0.143  0.278  1.0
  O  O30  1  0.359  0.719  0.277  1.0
  O  O31  1  0.201  0.457  0.662  1.0
  O  O32  1  0.549  0.871  0.004  1.0
  O  O33  1  0.218  0.351  0.090  1.0
  O  O34  1  0.435  0.563  0.499  1.0
  O  O35  1  0.235  0.774  0.110  1.0
  O  O36  1  0.100  0.847  0.549  1.0
  O  O37  1  0.871  0.549  0.504  1.0
  O  O38  1  0.089  0.342  0.506  1.0
  O  O39  1  0.272  0.821  0.940  1.0
  O  O40  1  0.457  0.201  0.162  1.0
  O  O41  1  0.847  0.100  0.049  1.0
  O  O42  1  0.774  0.235  0.610  1.0
  O  O43  1  0.043  0.518  0.264  1.0
  O  O44  1  0.143  0.807  0.778  1.0
  O  O45  1  0.863  0.075  0.778  1.0
  O  O46  1  0.563  0.435  0.999  1.0
  O  O47  1  0.342  0.089  0.006  1.0
[/CIF]
.
The material structure described by K3Cr4PO16 crystallizes in the monoclinic Cc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(16), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the third K site, K(3) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(15), one O(2), one O(4), one O(6), and one O(9) atom. There are four inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(10), one O(2), one O(4), and one O(7) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. In the second Cr site, Cr(2) is bonded to one O(11), one O(13), one O(16), and one O(9) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. In the third Cr site, Cr(3) is bonded to one O(1), one O(14), one O(5), and one O(8) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one O(12), one O(15), one O(3), and one O(6) atom to form CrO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra. P(1) is bonded to one O(12), one O(14), one O(16), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O4 tetrahedra,  a cornercorner with one Cr(2)O4 tetrahedra,  a cornercorner with one Cr(3)O4 tetrahedra, and  a cornercorner with one Cr(4)O4 tetrahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one K(2), one K(3), and one Cr(3) atom. In the second O site, O(2) is bonded in a single-bond geometry to one K(1), one K(2), one K(3), and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(4) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one K(1) and one Cr(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one Cr(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one K(2), one Cr(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Cr(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(3) and one Cr(2) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one K(1), one K(2), one K(3), and one Cr(1) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one Cr(2) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Cr(4) and one P(1) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one Cr(2) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Cr(3) and one P(1) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one K(3) and one Cr(4) atom. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to one K(2), one Cr(2), and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K3Cr4PO16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.726
_cell_length_b   7.726
_cell_length_c   15.091
_cell_angle_alpha   80.079
_cell_angle_beta   80.079
_cell_angle_gamma   102.211
_symmetry_Int_Tables_number   1
_cell_volume   846.558
_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
  K  K0  1  0.749  0.678  0.828  1.0
  K  K1  1  0.678  0.749  0.328  1.0
  K  K2  1  0.197  0.177  0.338  1.0
  K  K3  1  0.177  0.197  0.838  1.0
  K  K4  1  0.868  0.419  0.110  1.0
  K  K5  1  0.419  0.868  0.610  1.0
  Cr  Cr6  1  0.207  0.681  0.858  1.0
  Cr  Cr7  1  0.398  0.277  0.068  1.0
  Cr  Cr8  1  0.720  0.177  0.737  1.0
  Cr  Cr9  1  0.767  0.892  0.041  1.0
  Cr  Cr10  1  0.277  0.398  0.568  1.0
  Cr  Cr11  1  0.177  0.720  0.237  1.0
  Cr  Cr12  1  0.681  0.207  0.358  1.0
  Cr  Cr13  1  0.892  0.767  0.541  1.0
  P  P14  1  0.352  0.888  0.017  1.0
  P  P15  1  0.888  0.352  0.517  1.0
  O  O16  1  0.518  0.043  0.764  1.0
  O  O17  1  0.506  0.040  0.410  1.0
  O  O18  1  0.843  0.903  0.460  1.0
  O  O19  1  0.609  0.378  0.312  1.0
  O  O20  1  0.719  0.359  0.777  1.0
  O  O21  1  0.378  0.609  0.812  1.0
  O  O22  1  0.744  0.751  0.138  1.0
  O  O23  1  0.821  0.272  0.440  1.0
  O  O24  1  0.903  0.843  0.960  1.0
  O  O25  1  0.040  0.506  0.910  1.0
  O  O26  1  0.751  0.744  0.638  1.0
  O  O27  1  0.075  0.863  0.278  1.0
  O  O28  1  0.351  0.218  0.590  1.0
  O  O29  1  0.807  0.143  0.278  1.0
  O  O30  1  0.359  0.719  0.277  1.0
  O  O31  1  0.201  0.457  0.662  1.0
  O  O32  1  0.549  0.871  0.004  1.0
  O  O33  1  0.218  0.351  0.090  1.0
  O  O34  1  0.435  0.563  0.499  1.0
  O  O35  1  0.235  0.774  0.110  1.0
  O  O36  1  0.100  0.847  0.549  1.0
  O  O37  1  0.871  0.549  0.504  1.0
  O  O38  1  0.089  0.342  0.506  1.0
  O  O39  1  0.272  0.821  0.940  1.0
  O  O40  1  0.457  0.201  0.162  1.0
  O  O41  1  0.847  0.100  0.049  1.0
  O  O42  1  0.774  0.235  0.610  1.0
  O  O43  1  0.043  0.518  0.264  1.0
  O  O44  1  0.143  0.807  0.778  1.0
  O  O45  1  0.863  0.075  0.778  1.0
  O  O46  1  0.563  0.435  0.999  1.0
  O  O47  1  0.342  0.089  0.006  1.0
[/CIF]
.