The material described by Rb4GeO4 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Rb sites. In the first Rb site, Rb(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 Rb site, Rb(2) is bonded in a 6-coordinate geometry to one O(3), two equivalent O(1), and three equivalent O(2) atoms. In the third Rb site, Rb(3) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form distorted RbO4 trigonal pyramids that share corners with four equivalent Ge(1)O4 tetrahedra and  an edgeedge with one Rb(3)O4 trigonal pyramid. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. 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 Rb(3)O4 trigonal pyramids. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 1-coordinate geometry to one Rb(4), two equivalent Rb(1), two equivalent Rb(3), and one Ge(1) atom. In the second O site, O(1) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(3), one Rb(4), two equivalent Rb(2), and one Ge(1) atom. In the third O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Rb(4), three equivalent Rb(2), and one Ge(1) atom. In the fourth O site, O(3) is bonded in a 1-coordinate geometry to one Rb(2), one Rb(3), one Rb(4), two equivalent Rb(1), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb4GeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.796
_cell_length_b   10.878
_cell_length_c   11.004
_cell_angle_alpha   67.709
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   752.744
_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
  Rb  Rb0  1  0.685  0.291  0.079  1.0
  Rb  Rb1  1  0.185  0.209  0.921  1.0
  Rb  Rb2  1  0.315  0.709  0.921  1.0
  Rb  Rb3  1  0.815  0.791  0.079  1.0
  Rb  Rb4  1  0.915  0.205  0.433  1.0
  Rb  Rb5  1  0.415  0.295  0.567  1.0
  Rb  Rb6  1  0.085  0.795  0.567  1.0
  Rb  Rb7  1  0.585  0.705  0.433  1.0
  Rb  Rb8  1  0.173  0.391  0.127  1.0
  Rb  Rb9  1  0.673  0.109  0.873  1.0
  Rb  Rb10  1  0.827  0.609  0.873  1.0
  Rb  Rb11  1  0.327  0.891  0.127  1.0
  Rb  Rb12  1  0.886  0.422  0.657  1.0
  Rb  Rb13  1  0.386  0.078  0.343  1.0
  Rb  Rb14  1  0.114  0.578  0.343  1.0
  Rb  Rb15  1  0.614  0.922  0.657  1.0
  Ge  Ge16  1  0.871  0.988  0.261  1.0
  Ge  Ge17  1  0.371  0.512  0.739  1.0
  Ge  Ge18  1  0.129  0.012  0.739  1.0
  Ge  Ge19  1  0.629  0.488  0.261  1.0
  O  O20  1  0.004  0.839  0.285  1.0
  O  O21  1  0.504  0.661  0.715  1.0
  O  O22  1  0.996  0.161  0.715  1.0
  O  O23  1  0.496  0.339  0.285  1.0
  O  O24  1  0.731  0.473  0.414  1.0
  O  O25  1  0.231  0.027  0.586  1.0
  O  O26  1  0.269  0.527  0.586  1.0
  O  O27  1  0.769  0.973  0.414  1.0
  O  O28  1  0.026  0.131  0.193  1.0
  O  O29  1  0.526  0.369  0.807  1.0
  O  O30  1  0.974  0.869  0.807  1.0
  O  O31  1  0.474  0.631  0.193  1.0
  O  O32  1  0.672  0.006  0.149  1.0
  O  O33  1  0.172  0.494  0.851  1.0
  O  O34  1  0.328  0.994  0.851  1.0
  O  O35  1  0.828  0.506  0.149  1.0
[/CIF]
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The material described by Rb4GeO4 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Rb sites. In the first Rb site, Rb(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 Rb site, Rb(2) is bonded in a 6-coordinate geometry to one O(3), two equivalent O(1), and three equivalent O(2) atoms. In the third Rb site, Rb(3) is bonded to one O(1), one O(3), and two equivalent O(4) atoms to form distorted RbO4 trigonal pyramids that share corners with four equivalent Ge(1)O4 tetrahedra and  an edgeedge with one Rb(3)O4 trigonal pyramid. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. 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 Rb(3)O4 trigonal pyramids. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 1-coordinate geometry to one Rb(4), two equivalent Rb(1), two equivalent Rb(3), and one Ge(1) atom. In the second O site, O(1) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(3), one Rb(4), two equivalent Rb(2), and one Ge(1) atom. In the third O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Rb(4), three equivalent Rb(2), and one Ge(1) atom. In the fourth O site, O(3) is bonded in a 1-coordinate geometry to one Rb(2), one Rb(3), one Rb(4), two equivalent Rb(1), and one Ge(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb4GeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.796
_cell_length_b   10.878
_cell_length_c   11.004
_cell_angle_alpha   67.709
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   752.744
_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
  Rb  Rb0  1  0.685  0.291  0.079  1.0
  Rb  Rb1  1  0.185  0.209  0.921  1.0
  Rb  Rb2  1  0.315  0.709  0.921  1.0
  Rb  Rb3  1  0.815  0.791  0.079  1.0
  Rb  Rb4  1  0.915  0.205  0.433  1.0
  Rb  Rb5  1  0.415  0.295  0.567  1.0
  Rb  Rb6  1  0.085  0.795  0.567  1.0
  Rb  Rb7  1  0.585  0.705  0.433  1.0
  Rb  Rb8  1  0.173  0.391  0.127  1.0
  Rb  Rb9  1  0.673  0.109  0.873  1.0
  Rb  Rb10  1  0.827  0.609  0.873  1.0
  Rb  Rb11  1  0.327  0.891  0.127  1.0
  Rb  Rb12  1  0.886  0.422  0.657  1.0
  Rb  Rb13  1  0.386  0.078  0.343  1.0
  Rb  Rb14  1  0.114  0.578  0.343  1.0
  Rb  Rb15  1  0.614  0.922  0.657  1.0
  Ge  Ge16  1  0.871  0.988  0.261  1.0
  Ge  Ge17  1  0.371  0.512  0.739  1.0
  Ge  Ge18  1  0.129  0.012  0.739  1.0
  Ge  Ge19  1  0.629  0.488  0.261  1.0
  O  O20  1  0.004  0.839  0.285  1.0
  O  O21  1  0.504  0.661  0.715  1.0
  O  O22  1  0.996  0.161  0.715  1.0
  O  O23  1  0.496  0.339  0.285  1.0
  O  O24  1  0.731  0.473  0.414  1.0
  O  O25  1  0.231  0.027  0.586  1.0
  O  O26  1  0.269  0.527  0.586  1.0
  O  O27  1  0.769  0.973  0.414  1.0
  O  O28  1  0.026  0.131  0.193  1.0
  O  O29  1  0.526  0.369  0.807  1.0
  O  O30  1  0.974  0.869  0.807  1.0
  O  O31  1  0.474  0.631  0.193  1.0
  O  O32  1  0.672  0.006  0.149  1.0
  O  O33  1  0.172  0.494  0.851  1.0
  O  O34  1  0.328  0.994  0.851  1.0
  O  O35  1  0.828  0.506  0.149  1.0
[/CIF]
.