The compound described by MgGe4(BiO6)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted see-saw-like geometry to one O(12), one O(5), one O(7), and one O(9) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(4), one O(8), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Bi(1)O6 octahedra and corners with two equivalent Ge(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-60°. In the second Ge site, Ge(2) is bonded to one O(10), one O(2), one O(3), and one O(7) atom to form GeO4 tetrahedra that share corners with two equivalent Bi(1)O6 octahedra and corners with two equivalent Ge(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-65°. In the third Ge site, Ge(3) is bonded to one O(11), one O(2), one O(3), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Bi(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 63°. In the fourth Ge site, Ge(4) is bonded to one O(1), one O(12), one O(4), and one O(5) atom to form GeO4 tetrahedra that share  a cornercorner with one Bi(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom to form distorted BiO6 octahedra that share  a cornercorner with one Ge(3)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra, corners with two equivalent Ge(1)O4 tetrahedra, and corners with two equivalent Ge(2)O4 tetrahedra. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(5), one O(6), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(4) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ge(2) and one Ge(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ge(2) and one Ge(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(4) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Ge(4), and one Bi(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ge(3) and one Bi(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mg(1), one Ge(2), and one Bi(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(1) and one Bi(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one Ge(1), one Bi(1), and one Bi(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one Ge(2), one Bi(1), and one Bi(2) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ge(3), one Bi(1), and one Bi(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Mg(1), one Ge(4), one Bi(1), and one Bi(2) atom. is represented by the CIF file [CIF]
data_MgGe4(BiO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.809
_cell_length_b   7.436
_cell_length_c   7.246
_cell_angle_alpha   86.304
_cell_angle_beta   78.045
_cell_angle_gamma   73.139
_symmetry_Int_Tables_number   1
_cell_volume   293.054
_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
  Mg  Mg0  1  0.058  0.004  0.348  1.0
  Ge  Ge1  1  0.740  0.394  0.208  1.0
  Ge  Ge2  1  0.752  0.757  0.636  1.0
  Ge  Ge3  1  0.268  0.607  0.798  1.0
  Ge  Ge4  1  0.247  0.282  0.353  1.0
  Bi  Bi5  1  0.740  0.853  0.104  1.0
  Bi  Bi6  1  0.234  0.131  0.865  1.0
  O  O7  1  0.471  0.386  0.381  1.0
  O  O8  1  0.031  0.598  0.675  1.0
  O  O9  1  0.510  0.660  0.624  1.0
  O  O10  1  0.968  0.447  0.316  1.0
  O  O11  1  0.161  0.135  0.542  1.0
  O  O12  1  0.347  0.383  0.897  1.0
  O  O13  1  0.823  0.866  0.418  1.0
  O  O14  1  0.672  0.580  0.053  1.0
  O  O15  1  0.875  0.157  0.133  1.0
  O  O16  1  0.633  0.938  0.814  1.0
  O  O17  1  0.141  0.802  0.956  1.0
  O  O18  1  0.338  0.092  0.177  1.0
[/CIF]
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The compound described by MgGe4(BiO6)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted see-saw-like geometry to one O(12), one O(5), one O(7), and one O(9) atom. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(4), one O(8), and one O(9) atom to form GeO4 tetrahedra that share corners with two equivalent Bi(1)O6 octahedra and corners with two equivalent Ge(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-60°. In the second Ge site, Ge(2) is bonded to one O(10), one O(2), one O(3), and one O(7) atom to form GeO4 tetrahedra that share corners with two equivalent Bi(1)O6 octahedra and corners with two equivalent Ge(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-65°. In the third Ge site, Ge(3) is bonded to one O(11), one O(2), one O(3), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Bi(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 63°. In the fourth Ge site, Ge(4) is bonded to one O(1), one O(12), one O(4), and one O(5) atom to form GeO4 tetrahedra that share  a cornercorner with one Bi(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom to form distorted BiO6 octahedra that share  a cornercorner with one Ge(3)O4 tetrahedra,  a cornercorner with one Ge(4)O4 tetrahedra, corners with two equivalent Ge(1)O4 tetrahedra, and corners with two equivalent Ge(2)O4 tetrahedra. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(5), one O(6), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(4) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ge(2) and one Ge(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ge(2) and one Ge(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(4) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Ge(4), and one Bi(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ge(3) and one Bi(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mg(1), one Ge(2), and one Bi(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ge(1) and one Bi(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one Ge(1), one Bi(1), and one Bi(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one Ge(2), one Bi(1), and one Bi(2) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Ge(3), one Bi(1), and one Bi(2) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Mg(1), one Ge(4), one Bi(1), and one Bi(2) atom. is represented by the CIF file [CIF]
data_MgGe4(BiO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.809
_cell_length_b   7.436
_cell_length_c   7.246
_cell_angle_alpha   86.304
_cell_angle_beta   78.045
_cell_angle_gamma   73.139
_symmetry_Int_Tables_number   1
_cell_volume   293.054
_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
  Mg  Mg0  1  0.058  0.004  0.348  1.0
  Ge  Ge1  1  0.740  0.394  0.208  1.0
  Ge  Ge2  1  0.752  0.757  0.636  1.0
  Ge  Ge3  1  0.268  0.607  0.798  1.0
  Ge  Ge4  1  0.247  0.282  0.353  1.0
  Bi  Bi5  1  0.740  0.853  0.104  1.0
  Bi  Bi6  1  0.234  0.131  0.865  1.0
  O  O7  1  0.471  0.386  0.381  1.0
  O  O8  1  0.031  0.598  0.675  1.0
  O  O9  1  0.510  0.660  0.624  1.0
  O  O10  1  0.968  0.447  0.316  1.0
  O  O11  1  0.161  0.135  0.542  1.0
  O  O12  1  0.347  0.383  0.897  1.0
  O  O13  1  0.823  0.866  0.418  1.0
  O  O14  1  0.672  0.580  0.053  1.0
  O  O15  1  0.875  0.157  0.133  1.0
  O  O16  1  0.633  0.938  0.814  1.0
  O  O17  1  0.141  0.802  0.956  1.0
  O  O18  1  0.338  0.092  0.177  1.0
[/CIF]
.