The compound described by LiAlGe2O6 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded in a distorted pentagonal planar geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. Al(1) is bonded to one O(3), one O(6), two equivalent O(1), and two equivalent O(5) atoms to form AlO6 octahedra that share corners with three equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(1)O5 trigonal bipyramids, edges with two equivalent Al(1)O6 octahedra, and  an edgeedge with one Ge(1)O5 trigonal bipyramid. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(6) atom to form distorted GeO5 trigonal bipyramids that share corners with two equivalent Al(1)O6 octahedra, corners with three equivalent Ge(2)O4 tetrahedra, and  an edgeedge with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-51°. In the second Ge site, Ge(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form GeO4 tetrahedra that share corners with three equivalent Al(1)O6 octahedra and corners with three equivalent Ge(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 46-67°. There are six inequivalent O sites. In the first O site, O(5) is bonded to one Li(1), two equivalent Al(1), and one Ge(2) atom to form a mixture of corner and edge-sharing OLiAl2Ge tetrahedra. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Al(1), one Ge(1), and one Ge(2) atom. In the third O site, O(1) is bonded to one Li(1), two equivalent Al(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OLiAl2Ge tetrahedra. In the fourth O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Ge(1), and one Ge(2) atom. In the fifth O site, O(3) is bonded in a T-shaped geometry to one Li(1), one Al(1), and one Ge(1) atom. In the sixth O site, O(4) is bonded in a trigonal planar geometry to one Li(1), one Ge(1), and one Ge(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiAl(GeO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.490
_cell_length_b   5.459
_cell_length_c   9.596
_cell_angle_alpha   78.859
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   436.388
_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
  Li  Li0  1  0.217  0.295  0.008  1.0
  Li  Li1  1  0.283  0.295  0.508  1.0
  Li  Li2  1  0.783  0.705  0.992  1.0
  Li  Li3  1  0.717  0.705  0.492  1.0
  Al  Al4  1  0.413  0.750  0.995  1.0
  Al  Al5  1  0.087  0.750  0.495  1.0
  Al  Al6  1  0.587  0.250  0.005  1.0
  Al  Al7  1  0.913  0.250  0.505  1.0
  Ge  Ge8  1  0.916  0.431  0.791  1.0
  Ge  Ge9  1  0.584  0.431  0.291  1.0
  Ge  Ge10  1  0.084  0.569  0.209  1.0
  Ge  Ge11  1  0.416  0.569  0.709  1.0
  Ge  Ge12  1  0.113  0.946  0.779  1.0
  Ge  Ge13  1  0.387  0.946  0.279  1.0
  Ge  Ge14  1  0.887  0.054  0.221  1.0
  Ge  Ge15  1  0.613  0.054  0.721  1.0
  O  O16  1  0.927  0.543  0.603  1.0
  O  O17  1  0.573  0.543  0.103  1.0
  O  O18  1  0.073  0.457  0.397  1.0
  O  O19  1  0.427  0.457  0.897  1.0
  O  O20  1  0.989  0.699  0.859  1.0
  O  O21  1  0.511  0.699  0.359  1.0
  O  O22  1  0.011  0.301  0.141  1.0
  O  O23  1  0.489  0.301  0.641  1.0
  O  O24  1  0.743  0.411  0.889  1.0
  O  O25  1  0.757  0.411  0.389  1.0
  O  O26  1  0.257  0.589  0.111  1.0
  O  O27  1  0.243  0.589  0.611  1.0
  O  O28  1  0.068  0.209  0.857  1.0
  O  O29  1  0.432  0.209  0.357  1.0
  O  O30  1  0.932  0.791  0.143  1.0
  O  O31  1  0.568  0.791  0.643  1.0
  O  O32  1  0.098  0.036  0.590  1.0
  O  O33  1  0.402  0.036  0.090  1.0
  O  O34  1  0.902  0.964  0.410  1.0
  O  O35  1  0.598  0.964  0.910  1.0
  O  O36  1  0.310  0.882  0.826  1.0
  O  O37  1  0.190  0.882  0.326  1.0
  O  O38  1  0.690  0.118  0.174  1.0
  O  O39  1  0.810  0.118  0.674  1.0
[/CIF]
.
The compound described by LiAlGe2O6 crystallizes in the monoclinic P2_1/c space group. Li(1) is bonded in a distorted pentagonal planar geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. Al(1) is bonded to one O(3), one O(6), two equivalent O(1), and two equivalent O(5) atoms to form AlO6 octahedra that share corners with three equivalent Ge(2)O4 tetrahedra, corners with two equivalent Ge(1)O5 trigonal bipyramids, edges with two equivalent Al(1)O6 octahedra, and  an edgeedge with one Ge(1)O5 trigonal bipyramid. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(6) atom to form distorted GeO5 trigonal bipyramids that share corners with two equivalent Al(1)O6 octahedra, corners with three equivalent Ge(2)O4 tetrahedra, and  an edgeedge with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-51°. In the second Ge site, Ge(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form GeO4 tetrahedra that share corners with three equivalent Al(1)O6 octahedra and corners with three equivalent Ge(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 46-67°. There are six inequivalent O sites. In the first O site, O(5) is bonded to one Li(1), two equivalent Al(1), and one Ge(2) atom to form a mixture of corner and edge-sharing OLiAl2Ge tetrahedra. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Al(1), one Ge(1), and one Ge(2) atom. In the third O site, O(1) is bonded to one Li(1), two equivalent Al(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OLiAl2Ge tetrahedra. In the fourth O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Ge(1), and one Ge(2) atom. In the fifth O site, O(3) is bonded in a T-shaped geometry to one Li(1), one Al(1), and one Ge(1) atom. In the sixth O site, O(4) is bonded in a trigonal planar geometry to one Li(1), one Ge(1), and one Ge(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiAl(GeO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.490
_cell_length_b   5.459
_cell_length_c   9.596
_cell_angle_alpha   78.859
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   436.388
_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
  Li  Li0  1  0.217  0.295  0.008  1.0
  Li  Li1  1  0.283  0.295  0.508  1.0
  Li  Li2  1  0.783  0.705  0.992  1.0
  Li  Li3  1  0.717  0.705  0.492  1.0
  Al  Al4  1  0.413  0.750  0.995  1.0
  Al  Al5  1  0.087  0.750  0.495  1.0
  Al  Al6  1  0.587  0.250  0.005  1.0
  Al  Al7  1  0.913  0.250  0.505  1.0
  Ge  Ge8  1  0.916  0.431  0.791  1.0
  Ge  Ge9  1  0.584  0.431  0.291  1.0
  Ge  Ge10  1  0.084  0.569  0.209  1.0
  Ge  Ge11  1  0.416  0.569  0.709  1.0
  Ge  Ge12  1  0.113  0.946  0.779  1.0
  Ge  Ge13  1  0.387  0.946  0.279  1.0
  Ge  Ge14  1  0.887  0.054  0.221  1.0
  Ge  Ge15  1  0.613  0.054  0.721  1.0
  O  O16  1  0.927  0.543  0.603  1.0
  O  O17  1  0.573  0.543  0.103  1.0
  O  O18  1  0.073  0.457  0.397  1.0
  O  O19  1  0.427  0.457  0.897  1.0
  O  O20  1  0.989  0.699  0.859  1.0
  O  O21  1  0.511  0.699  0.359  1.0
  O  O22  1  0.011  0.301  0.141  1.0
  O  O23  1  0.489  0.301  0.641  1.0
  O  O24  1  0.743  0.411  0.889  1.0
  O  O25  1  0.757  0.411  0.389  1.0
  O  O26  1  0.257  0.589  0.111  1.0
  O  O27  1  0.243  0.589  0.611  1.0
  O  O28  1  0.068  0.209  0.857  1.0
  O  O29  1  0.432  0.209  0.357  1.0
  O  O30  1  0.932  0.791  0.143  1.0
  O  O31  1  0.568  0.791  0.643  1.0
  O  O32  1  0.098  0.036  0.590  1.0
  O  O33  1  0.402  0.036  0.090  1.0
  O  O34  1  0.902  0.964  0.410  1.0
  O  O35  1  0.598  0.964  0.910  1.0
  O  O36  1  0.310  0.882  0.826  1.0
  O  O37  1  0.190  0.882  0.326  1.0
  O  O38  1  0.690  0.118  0.174  1.0
  O  O39  1  0.810  0.118  0.674  1.0
[/CIF]
.