The material described by Cu2Fe2Ge4O13 crystallizes in the monoclinic P2_1/m space group. Fe(1) is bonded to one O(2), one O(3), one O(6), one O(9), and two equivalent O(4) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Ge(3)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra, corners with three equivalent Ge(1)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. Cu(1) is bonded in a square co-planar geometry to one O(3), one O(9), and two equivalent O(1) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(7), and two equivalent O(4) atoms to form distorted GeO4 tetrahedra that share corners with six equivalent Fe(1)O6 octahedra and  a cornercorner with one Ge(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-64°. In the second Ge site, Ge(2) is bonded to one O(5), one O(8), and two equivalent O(1) atoms to form corner-sharing GeO4 tetrahedra. In the third Ge site, Ge(3) is bonded to one O(5), one O(7), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Ge(1)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. In the fourth Ge site, Ge(4) is bonded to one O(6), one O(8), and two equivalent O(9) atoms to form GeO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and  a cornercorner with one Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. There are nine inequivalent O sites. In the first O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Fe(1) and one Ge(4) atom. In the second O site, O(7) is bonded in a bent 150 degrees geometry to one Ge(1) and one Ge(3) atom. In the third O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(2) and one Ge(4) atom. In the fourth O site, O(9) is bonded in a trigonal planar geometry to one Fe(1), one Cu(1), and one Ge(4) atom. In the fifth O site, O(1) is bonded in a trigonal planar geometry to two equivalent Cu(1) and one Ge(2) atom. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one Ge(1) atom. In the seventh O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1), one Cu(1), and one Ge(3) atom. In the eighth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one Ge(1) atom. In the ninth O site, O(5) is bonded in a bent 120 degrees geometry to one Ge(2) and one Ge(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Fe2Cu2Ge4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.709
_cell_length_b   4.968
_cell_length_c   12.198
_cell_angle_alpha   83.879
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   524.752
_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
  Fe  Fe0  1  0.064  0.045  0.623  1.0
  Fe  Fe1  1  0.564  0.955  0.377  1.0
  Fe  Fe2  1  0.936  0.955  0.377  1.0
  Fe  Fe3  1  0.436  0.045  0.623  1.0
  Cu  Cu4  1  0.998  0.042  0.874  1.0
  Cu  Cu5  1  0.498  0.958  0.126  1.0
  Cu  Cu6  1  0.002  0.958  0.126  1.0
  Cu  Cu7  1  0.502  0.042  0.874  1.0
  Ge  Ge8  1  0.750  0.393  0.512  1.0
  Ge  Ge9  1  0.250  0.607  0.488  1.0
  Ge  Ge10  1  0.750  0.607  0.994  1.0
  Ge  Ge11  1  0.250  0.393  0.006  1.0
  Ge  Ge12  1  0.750  0.672  0.746  1.0
  Ge  Ge13  1  0.250  0.328  0.254  1.0
  Ge  Ge14  1  0.750  0.514  0.240  1.0
  Ge  Ge15  1  0.250  0.486  0.760  1.0
  O  O16  1  0.420  0.201  0.003  1.0
  O  O17  1  0.920  0.799  0.997  1.0
  O  O18  1  0.580  0.799  0.997  1.0
  O  O19  1  0.080  0.201  0.003  1.0
  O  O20  1  0.750  0.719  0.436  1.0
  O  O21  1  0.250  0.281  0.564  1.0
  O  O22  1  0.420  0.130  0.259  1.0
  O  O23  1  0.920  0.870  0.741  1.0
  O  O24  1  0.580  0.870  0.741  1.0
  O  O25  1  0.080  0.130  0.259  1.0
  O  O26  1  0.424  0.793  0.496  1.0
  O  O27  1  0.924  0.207  0.504  1.0
  O  O28  1  0.576  0.207  0.504  1.0
  O  O29  1  0.076  0.793  0.496  1.0
  O  O30  1  0.750  0.448  0.872  1.0
  O  O31  1  0.250  0.552  0.128  1.0
  O  O32  1  0.250  0.789  0.668  1.0
  O  O33  1  0.750  0.211  0.332  1.0
  O  O34  1  0.250  0.568  0.346  1.0
  O  O35  1  0.750  0.432  0.654  1.0
  O  O36  1  0.250  0.633  0.888  1.0
  O  O37  1  0.750  0.367  0.112  1.0
  O  O38  1  0.084  0.280  0.751  1.0
  O  O39  1  0.584  0.720  0.249  1.0
  O  O40  1  0.916  0.720  0.249  1.0
  O  O41  1  0.416  0.280  0.751  1.0
[/CIF]
.
The material described by Cu2Fe2Ge4O13 crystallizes in the monoclinic P2_1/m space group. Fe(1) is bonded to one O(2), one O(3), one O(6), one O(9), and two equivalent O(4) atoms to form distorted FeO6 octahedra that share  a cornercorner with one Ge(3)O4 tetrahedra, corners with two equivalent Ge(4)O4 tetrahedra, corners with three equivalent Ge(1)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. Cu(1) is bonded in a square co-planar geometry to one O(3), one O(9), and two equivalent O(1) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(2), one O(7), and two equivalent O(4) atoms to form distorted GeO4 tetrahedra that share corners with six equivalent Fe(1)O6 octahedra and  a cornercorner with one Ge(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-64°. In the second Ge site, Ge(2) is bonded to one O(5), one O(8), and two equivalent O(1) atoms to form corner-sharing GeO4 tetrahedra. In the third Ge site, Ge(3) is bonded to one O(5), one O(7), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one Ge(1)O4 tetrahedra, and  a cornercorner with one Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. In the fourth Ge site, Ge(4) is bonded to one O(6), one O(8), and two equivalent O(9) atoms to form GeO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra and  a cornercorner with one Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. There are nine inequivalent O sites. In the first O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Fe(1) and one Ge(4) atom. In the second O site, O(7) is bonded in a bent 150 degrees geometry to one Ge(1) and one Ge(3) atom. In the third O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(2) and one Ge(4) atom. In the fourth O site, O(9) is bonded in a trigonal planar geometry to one Fe(1), one Cu(1), and one Ge(4) atom. In the fifth O site, O(1) is bonded in a trigonal planar geometry to two equivalent Cu(1) and one Ge(2) atom. In the sixth O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one Ge(1) atom. In the seventh O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1), one Cu(1), and one Ge(3) atom. In the eighth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one Ge(1) atom. In the ninth O site, O(5) is bonded in a bent 120 degrees geometry to one Ge(2) and one Ge(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Fe2Cu2Ge4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.709
_cell_length_b   4.968
_cell_length_c   12.198
_cell_angle_alpha   83.879
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   524.752
_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
  Fe  Fe0  1  0.064  0.045  0.623  1.0
  Fe  Fe1  1  0.564  0.955  0.377  1.0
  Fe  Fe2  1  0.936  0.955  0.377  1.0
  Fe  Fe3  1  0.436  0.045  0.623  1.0
  Cu  Cu4  1  0.998  0.042  0.874  1.0
  Cu  Cu5  1  0.498  0.958  0.126  1.0
  Cu  Cu6  1  0.002  0.958  0.126  1.0
  Cu  Cu7  1  0.502  0.042  0.874  1.0
  Ge  Ge8  1  0.750  0.393  0.512  1.0
  Ge  Ge9  1  0.250  0.607  0.488  1.0
  Ge  Ge10  1  0.750  0.607  0.994  1.0
  Ge  Ge11  1  0.250  0.393  0.006  1.0
  Ge  Ge12  1  0.750  0.672  0.746  1.0
  Ge  Ge13  1  0.250  0.328  0.254  1.0
  Ge  Ge14  1  0.750  0.514  0.240  1.0
  Ge  Ge15  1  0.250  0.486  0.760  1.0
  O  O16  1  0.420  0.201  0.003  1.0
  O  O17  1  0.920  0.799  0.997  1.0
  O  O18  1  0.580  0.799  0.997  1.0
  O  O19  1  0.080  0.201  0.003  1.0
  O  O20  1  0.750  0.719  0.436  1.0
  O  O21  1  0.250  0.281  0.564  1.0
  O  O22  1  0.420  0.130  0.259  1.0
  O  O23  1  0.920  0.870  0.741  1.0
  O  O24  1  0.580  0.870  0.741  1.0
  O  O25  1  0.080  0.130  0.259  1.0
  O  O26  1  0.424  0.793  0.496  1.0
  O  O27  1  0.924  0.207  0.504  1.0
  O  O28  1  0.576  0.207  0.504  1.0
  O  O29  1  0.076  0.793  0.496  1.0
  O  O30  1  0.750  0.448  0.872  1.0
  O  O31  1  0.250  0.552  0.128  1.0
  O  O32  1  0.250  0.789  0.668  1.0
  O  O33  1  0.750  0.211  0.332  1.0
  O  O34  1  0.250  0.568  0.346  1.0
  O  O35  1  0.750  0.432  0.654  1.0
  O  O36  1  0.250  0.633  0.888  1.0
  O  O37  1  0.750  0.367  0.112  1.0
  O  O38  1  0.084  0.280  0.751  1.0
  O  O39  1  0.584  0.720  0.249  1.0
  O  O40  1  0.916  0.720  0.249  1.0
  O  O41  1  0.416  0.280  0.751  1.0
[/CIF]
.