The compound described by Fe9Cu3O16 is Spinel-like structured and crystallizes in the triclinic P-1 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(4), one O(7), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(6)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with two equivalent Cu(2)O6 octahedra, corners with three equivalent Fe(3)O6 octahedra, and corners with three equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-59°. In the second Fe site, Fe(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(5)O6 octahedra,  a cornercorner with one Cu(2)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, corners with two equivalent Fe(6)O6 octahedra, corners with three equivalent Fe(3)O6 octahedra, and corners with three equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-59°. In the third Fe site, Fe(3) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form FeO6 octahedra that share corners with three equivalent Fe(1)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Cu(2)O6 octahedra, and edges with two equivalent Cu(1)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Fe(3)O6 octahedra, edges with two equivalent Fe(6)O6 octahedra, and edges with two equivalent Cu(1)O6 octahedra. In the fifth Fe site, Fe(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra, corners with four equivalent Fe(1)O4 tetrahedra, edges with two equivalent Fe(3)O6 octahedra, edges with two equivalent Cu(1)O6 octahedra, and edges with two equivalent Cu(2)O6 octahedra. In the sixth Fe site, Fe(6) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Fe(3)O6 octahedra, edges with two equivalent Fe(4)O6 octahedra, and edges with two equivalent Cu(1)O6 octahedra. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(2), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form CuO6 octahedra that share corners with three equivalent Fe(1)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Cu(2)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. In the second Cu site, Cu(2) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms to form CuO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra, corners with four equivalent Fe(1)O4 tetrahedra, edges with two equivalent Fe(3)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and edges with two equivalent Cu(1)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Fe(2), one Fe(3), one Fe(4), and one Fe(6) atom to form distorted corner-sharing OFe4 trigonal pyramids. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Fe(3), one Fe(4), and one Cu(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(4), one Fe(6), and one Cu(1) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Fe(3), one Fe(5), and one Cu(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Cu(1), and one Cu(2) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Fe(5), and one Cu(1) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Fe(5), one Cu(1), and one Cu(2) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Fe(3), one Fe(6), and one Cu(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Fe9Cu3O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.020
_cell_length_b   12.064
_cell_length_c   10.361
_cell_angle_alpha   30.142
_cell_angle_beta   55.295
_cell_angle_gamma   60.387
_symmetry_Int_Tables_number   1
_cell_volume   310.581
_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
  Fe  Fe0  1  0.008  0.005  0.996  1.0
  Fe  Fe1  1  0.245  0.997  0.250  1.0
  Fe  Fe2  1  0.005  0.503  1.000  1.0
  Fe  Fe3  1  0.120  0.997  0.632  1.0
  Fe  Fe4  1  0.242  0.495  0.254  1.0
  Fe  Fe5  1  0.625  0.250  0.125  1.0
  Fe  Fe6  1  0.130  0.503  0.618  1.0
  Fe  Fe7  1  0.625  0.250  0.625  1.0
  Fe  Fe8  1  0.625  0.750  0.625  1.0
  Cu  Cu9  1  0.623  0.997  0.630  1.0
  Cu  Cu10  1  0.625  0.750  0.125  1.0
  Cu  Cu11  1  0.627  0.503  0.620  1.0
  O  O12  1  0.384  0.001  0.381  1.0
  O  O13  1  0.378  0.237  0.376  1.0
  O  O14  1  0.853  0.999  0.379  1.0
  O  O15  1  0.371  0.488  0.395  1.0
  O  O16  1  0.366  0.736  0.390  1.0
  O  O17  1  0.374  0.259  0.858  1.0
  O  O18  1  0.876  0.241  0.392  1.0
  O  O19  1  0.856  0.495  0.383  1.0
  O  O20  1  0.397  0.501  0.871  1.0
  O  O21  1  0.375  0.758  0.858  1.0
  O  O22  1  0.872  0.263  0.874  1.0
  O  O23  1  0.875  0.742  0.392  1.0
  O  O24  1  0.866  0.499  0.869  1.0
  O  O25  1  0.394  0.005  0.867  1.0
  O  O26  1  0.884  0.764  0.860  1.0
  O  O27  1  0.879  0.012  0.855  1.0
[/CIF]
.
The compound described by Fe9Cu3O16 is Spinel-like structured and crystallizes in the triclinic P-1 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(4), one O(7), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(6)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, corners with two equivalent Cu(2)O6 octahedra, corners with three equivalent Fe(3)O6 octahedra, and corners with three equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 55-59°. In the second Fe site, Fe(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(5)O6 octahedra,  a cornercorner with one Cu(2)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, corners with two equivalent Fe(6)O6 octahedra, corners with three equivalent Fe(3)O6 octahedra, and corners with three equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-59°. In the third Fe site, Fe(3) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form FeO6 octahedra that share corners with three equivalent Fe(1)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Cu(2)O6 octahedra, and edges with two equivalent Cu(1)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Fe(3)O6 octahedra, edges with two equivalent Fe(6)O6 octahedra, and edges with two equivalent Cu(1)O6 octahedra. In the fifth Fe site, Fe(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra, corners with four equivalent Fe(1)O4 tetrahedra, edges with two equivalent Fe(3)O6 octahedra, edges with two equivalent Cu(1)O6 octahedra, and edges with two equivalent Cu(2)O6 octahedra. In the sixth Fe site, Fe(6) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(8) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O4 tetrahedra, corners with four equivalent Fe(2)O4 tetrahedra, edges with two equivalent Fe(3)O6 octahedra, edges with two equivalent Fe(4)O6 octahedra, and edges with two equivalent Cu(1)O6 octahedra. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(2), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form CuO6 octahedra that share corners with three equivalent Fe(1)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Fe(5)O6 octahedra,  an edgeedge with one Fe(6)O6 octahedra,  an edgeedge with one Cu(2)O6 octahedra, and edges with two equivalent Fe(3)O6 octahedra. In the second Cu site, Cu(2) is bonded to two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms to form CuO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra, corners with four equivalent Fe(1)O4 tetrahedra, edges with two equivalent Fe(3)O6 octahedra, edges with two equivalent Fe(5)O6 octahedra, and edges with two equivalent Cu(1)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Fe(2), one Fe(3), one Fe(4), and one Fe(6) atom to form distorted corner-sharing OFe4 trigonal pyramids. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Fe(3), one Fe(4), and one Cu(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(4), one Fe(6), and one Cu(1) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Fe(3), one Fe(5), and one Cu(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Cu(1), and one Cu(2) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Fe(2), one Fe(3), one Fe(5), and one Cu(1) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Fe(5), one Cu(1), and one Cu(2) atom. In the eighth O site, O(8) is bonded in a rectangular see-saw-like geometry to one Fe(1), one Fe(3), one Fe(6), and one Cu(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Fe9Cu3O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.020
_cell_length_b   12.064
_cell_length_c   10.361
_cell_angle_alpha   30.142
_cell_angle_beta   55.295
_cell_angle_gamma   60.387
_symmetry_Int_Tables_number   1
_cell_volume   310.581
_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
  Fe  Fe0  1  0.008  0.005  0.996  1.0
  Fe  Fe1  1  0.245  0.997  0.250  1.0
  Fe  Fe2  1  0.005  0.503  1.000  1.0
  Fe  Fe3  1  0.120  0.997  0.632  1.0
  Fe  Fe4  1  0.242  0.495  0.254  1.0
  Fe  Fe5  1  0.625  0.250  0.125  1.0
  Fe  Fe6  1  0.130  0.503  0.618  1.0
  Fe  Fe7  1  0.625  0.250  0.625  1.0
  Fe  Fe8  1  0.625  0.750  0.625  1.0
  Cu  Cu9  1  0.623  0.997  0.630  1.0
  Cu  Cu10  1  0.625  0.750  0.125  1.0
  Cu  Cu11  1  0.627  0.503  0.620  1.0
  O  O12  1  0.384  0.001  0.381  1.0
  O  O13  1  0.378  0.237  0.376  1.0
  O  O14  1  0.853  0.999  0.379  1.0
  O  O15  1  0.371  0.488  0.395  1.0
  O  O16  1  0.366  0.736  0.390  1.0
  O  O17  1  0.374  0.259  0.858  1.0
  O  O18  1  0.876  0.241  0.392  1.0
  O  O19  1  0.856  0.495  0.383  1.0
  O  O20  1  0.397  0.501  0.871  1.0
  O  O21  1  0.375  0.758  0.858  1.0
  O  O22  1  0.872  0.263  0.874  1.0
  O  O23  1  0.875  0.742  0.392  1.0
  O  O24  1  0.866  0.499  0.869  1.0
  O  O25  1  0.394  0.005  0.867  1.0
  O  O26  1  0.884  0.764  0.860  1.0
  O  O27  1  0.879  0.012  0.855  1.0
[/CIF]
.