The material structure described by K4GeO4 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to one O(3), two equivalent O(1), and three equivalent O(2) atoms. In the fourth K site, K(4) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form distorted KO4 tetrahedra that share corners with four equivalent Ge(1)O4 tetrahedra and  an edgeedge with one K(4)O4 tetrahedra. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with four equivalent K(4)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(4), two equivalent K(3), and one Ge(1) atom. In the second O site, O(2) is bonded to two equivalent K(2), three equivalent K(3), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OK5Ge octahedra. The corner-sharing octahedral tilt angles range from 44-45°. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(2), one K(3), one K(4), two equivalent K(1), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent K(4), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4GeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.560
_cell_length_b   10.436
_cell_length_c   10.488
_cell_angle_alpha   68.259
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   666.920
_cell_formula_units_Z   4
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  0.196  0.933  0.200  1.0
  K  K1  1  0.304  0.933  0.700  1.0
  K  K2  1  0.606  0.664  0.915  1.0
  K  K3  1  0.909  0.442  0.196  1.0
  K  K4  1  0.409  0.558  0.304  1.0
  K  K5  1  0.091  0.558  0.804  1.0
  K  K6  1  0.591  0.442  0.696  1.0
  K  K7  1  0.165  0.135  0.389  1.0
  K  K8  1  0.665  0.865  0.111  1.0
  K  K9  1  0.835  0.865  0.611  1.0
  K  K10  1  0.335  0.135  0.889  1.0
  K  K11  1  0.894  0.664  0.415  1.0
  K  K12  1  0.394  0.336  0.085  1.0
  K  K13  1  0.106  0.336  0.585  1.0
  K  K14  1  0.696  0.067  0.300  1.0
  K  K15  1  0.804  0.067  0.800  1.0
  Ge  Ge16  1  0.634  0.258  0.492  1.0
  Ge  Ge17  1  0.366  0.742  0.508  1.0
  Ge  Ge18  1  0.866  0.258  0.992  1.0
  Ge  Ge19  1  0.134  0.742  0.008  1.0
  O  O20  1  0.001  0.276  0.840  1.0
  O  O21  1  0.257  0.579  0.534  1.0
  O  O22  1  0.757  0.421  0.966  1.0
  O  O23  1  0.030  0.199  0.138  1.0
  O  O24  1  0.530  0.801  0.362  1.0
  O  O25  1  0.970  0.801  0.862  1.0
  O  O26  1  0.470  0.199  0.638  1.0
  O  O27  1  0.665  0.135  0.022  1.0
  O  O28  1  0.165  0.865  0.478  1.0
  O  O29  1  0.335  0.865  0.978  1.0
  O  O30  1  0.835  0.135  0.522  1.0
  O  O31  1  0.499  0.276  0.340  1.0
  O  O32  1  0.743  0.421  0.466  1.0
  O  O33  1  0.999  0.724  0.160  1.0
  O  O34  1  0.501  0.724  0.660  1.0
  O  O35  1  0.243  0.579  0.034  1.0
[/CIF]
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The material structure described by K4GeO4 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to one O(3), two equivalent O(1), and three equivalent O(2) atoms. In the fourth K site, K(4) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form distorted KO4 tetrahedra that share corners with four equivalent Ge(1)O4 tetrahedra and  an edgeedge with one K(4)O4 tetrahedra. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with four equivalent K(4)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(4), two equivalent K(3), and one Ge(1) atom. In the second O site, O(2) is bonded to two equivalent K(2), three equivalent K(3), and one Ge(1) atom to form a mixture of distorted edge and corner-sharing OK5Ge octahedra. The corner-sharing octahedral tilt angles range from 44-45°. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(2), one K(3), one K(4), two equivalent K(1), and one Ge(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent K(4), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4GeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.560
_cell_length_b   10.436
_cell_length_c   10.488
_cell_angle_alpha   68.259
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   666.920
_cell_formula_units_Z   4
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  0.196  0.933  0.200  1.0
  K  K1  1  0.304  0.933  0.700  1.0
  K  K2  1  0.606  0.664  0.915  1.0
  K  K3  1  0.909  0.442  0.196  1.0
  K  K4  1  0.409  0.558  0.304  1.0
  K  K5  1  0.091  0.558  0.804  1.0
  K  K6  1  0.591  0.442  0.696  1.0
  K  K7  1  0.165  0.135  0.389  1.0
  K  K8  1  0.665  0.865  0.111  1.0
  K  K9  1  0.835  0.865  0.611  1.0
  K  K10  1  0.335  0.135  0.889  1.0
  K  K11  1  0.894  0.664  0.415  1.0
  K  K12  1  0.394  0.336  0.085  1.0
  K  K13  1  0.106  0.336  0.585  1.0
  K  K14  1  0.696  0.067  0.300  1.0
  K  K15  1  0.804  0.067  0.800  1.0
  Ge  Ge16  1  0.634  0.258  0.492  1.0
  Ge  Ge17  1  0.366  0.742  0.508  1.0
  Ge  Ge18  1  0.866  0.258  0.992  1.0
  Ge  Ge19  1  0.134  0.742  0.008  1.0
  O  O20  1  0.001  0.276  0.840  1.0
  O  O21  1  0.257  0.579  0.534  1.0
  O  O22  1  0.757  0.421  0.966  1.0
  O  O23  1  0.030  0.199  0.138  1.0
  O  O24  1  0.530  0.801  0.362  1.0
  O  O25  1  0.970  0.801  0.862  1.0
  O  O26  1  0.470  0.199  0.638  1.0
  O  O27  1  0.665  0.135  0.022  1.0
  O  O28  1  0.165  0.865  0.478  1.0
  O  O29  1  0.335  0.865  0.978  1.0
  O  O30  1  0.835  0.135  0.522  1.0
  O  O31  1  0.499  0.276  0.340  1.0
  O  O32  1  0.743  0.421  0.466  1.0
  O  O33  1  0.999  0.724  0.160  1.0
  O  O34  1  0.501  0.724  0.660  1.0
  O  O35  1  0.243  0.579  0.034  1.0
[/CIF]
.