The material described by Na4MgTi2(GeO5)2 crystallizes in the monoclinic Pm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(4), and one O(5) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and one O(8) atom. Mg(1) is bonded to one O(6), one O(7), and two equivalent O(3) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent Ti(1)O5 trigonal bipyramids and corners with two equivalent Ti(2)O5 trigonal bipyramids. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(2), one O(8), and two equivalent O(3) atoms to form distorted TiO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra and corners with two equivalent Ge(2)O4 tetrahedra. In the second Ti site, Ti(2) is bonded to one O(5), one O(6), one O(7), and two equivalent O(4) atoms to form TiO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra and corners with two equivalent Ge(2)O4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a distorted water-like geometry to one O(5) and one O(6) atom. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form GeO4 tetrahedra that share corners with two equivalent Ti(1)O5 trigonal bipyramids and corners with two equivalent Ti(2)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(2), one Ti(1), and one Ge(2) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Na(1), one Ti(1), and one Ge(2) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Mg(1), and one Ti(1) atom to form distorted ONa2MgTi trigonal pyramids that share  a cornercorner with one O(5)Na2TiGe tetrahedra, corners with two equivalent O(3)Na2MgTi trigonal pyramids, and  an edgeedge with one O(6)Na2MgTiGe trigonal bipyramid. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Ti(2), and one Ge(2) atom. In the fifth O site, O(5) is bonded to two equivalent Na(1), one Ti(2), and one Ge(1) atom to form ONa2TiGe tetrahedra that share corners with two equivalent O(6)Na2MgTiGe trigonal bipyramids and corners with two equivalent O(3)Na2MgTi trigonal pyramids. In the sixth O site, O(6) is bonded to two equivalent Na(2), one Mg(1), one Ti(2), and one Ge(1) atom to form distorted ONa2MgTiGe trigonal bipyramids that share corners with two equivalent O(5)Na2TiGe tetrahedra and edges with two equivalent O(3)Na2MgTi trigonal pyramids. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Mg(1) and one Ti(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one Ti(1) atom. is represented by the CIF card [CIF]
data_Na4MgTi2(GeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.593
_cell_length_b   6.908
_cell_length_c   6.840
_cell_angle_alpha   90.000
_cell_angle_beta   91.151
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   264.235
_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
  Na  Na0  1  0.986  0.981  0.016  1.0
  Na  Na1  1  0.986  0.519  0.016  1.0
  Na  Na2  1  0.083  0.572  0.508  1.0
  Na  Na3  1  0.083  0.928  0.508  1.0
  Mg  Mg4  1  0.822  0.250  0.588  1.0
  Ti  Ti5  1  0.636  0.750  0.725  1.0
  Ti  Ti6  1  0.364  0.250  0.269  1.0
  Ge  Ge7  1  0.405  0.250  0.771  1.0
  Ge  Ge8  1  0.515  0.750  0.234  1.0
  O  O9  1  0.725  0.750  0.429  1.0
  O  O10  1  0.690  0.750  0.023  1.0
  O  O11  1  0.782  0.499  0.724  1.0
  O  O12  1  0.782  0.001  0.724  1.0
  O  O13  1  0.317  0.958  0.244  1.0
  O  O14  1  0.233  0.250  0.991  1.0
  O  O15  1  0.182  0.250  0.515  1.0
  O  O16  1  0.317  0.542  0.244  1.0
  O  O17  1  0.670  0.250  0.318  1.0
  O  O18  1  0.321  0.750  0.713  1.0
[/CIF]
.
The material described by Na4MgTi2(GeO5)2 crystallizes in the monoclinic Pm space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(4), and one O(5) atom. In the second Na site, Na(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and one O(8) atom. Mg(1) is bonded to one O(6), one O(7), and two equivalent O(3) atoms to form distorted MgO4 tetrahedra that share corners with two equivalent Ti(1)O5 trigonal bipyramids and corners with two equivalent Ti(2)O5 trigonal bipyramids. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(2), one O(8), and two equivalent O(3) atoms to form distorted TiO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra and corners with two equivalent Ge(2)O4 tetrahedra. In the second Ti site, Ti(2) is bonded to one O(5), one O(6), one O(7), and two equivalent O(4) atoms to form TiO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra and corners with two equivalent Ge(2)O4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a distorted water-like geometry to one O(5) and one O(6) atom. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), and two equivalent O(4) atoms to form GeO4 tetrahedra that share corners with two equivalent Ti(1)O5 trigonal bipyramids and corners with two equivalent Ti(2)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(2), one Ti(1), and one Ge(2) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to two equivalent Na(1), one Ti(1), and one Ge(2) atom. In the third O site, O(3) is bonded to one Na(1), one Na(2), one Mg(1), and one Ti(1) atom to form distorted ONa2MgTi trigonal pyramids that share  a cornercorner with one O(5)Na2TiGe tetrahedra, corners with two equivalent O(3)Na2MgTi trigonal pyramids, and  an edgeedge with one O(6)Na2MgTiGe trigonal bipyramid. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Na(1), one Na(2), one Ti(2), and one Ge(2) atom. In the fifth O site, O(5) is bonded to two equivalent Na(1), one Ti(2), and one Ge(1) atom to form ONa2TiGe tetrahedra that share corners with two equivalent O(6)Na2MgTiGe trigonal bipyramids and corners with two equivalent O(3)Na2MgTi trigonal pyramids. In the sixth O site, O(6) is bonded to two equivalent Na(2), one Mg(1), one Ti(2), and one Ge(1) atom to form distorted ONa2MgTiGe trigonal bipyramids that share corners with two equivalent O(5)Na2TiGe tetrahedra and edges with two equivalent O(3)Na2MgTi trigonal pyramids. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Mg(1) and one Ti(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one Ti(1) atom. is represented by the CIF card [CIF]
data_Na4MgTi2(GeO5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.593
_cell_length_b   6.908
_cell_length_c   6.840
_cell_angle_alpha   90.000
_cell_angle_beta   91.151
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   264.235
_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
  Na  Na0  1  0.986  0.981  0.016  1.0
  Na  Na1  1  0.986  0.519  0.016  1.0
  Na  Na2  1  0.083  0.572  0.508  1.0
  Na  Na3  1  0.083  0.928  0.508  1.0
  Mg  Mg4  1  0.822  0.250  0.588  1.0
  Ti  Ti5  1  0.636  0.750  0.725  1.0
  Ti  Ti6  1  0.364  0.250  0.269  1.0
  Ge  Ge7  1  0.405  0.250  0.771  1.0
  Ge  Ge8  1  0.515  0.750  0.234  1.0
  O  O9  1  0.725  0.750  0.429  1.0
  O  O10  1  0.690  0.750  0.023  1.0
  O  O11  1  0.782  0.499  0.724  1.0
  O  O12  1  0.782  0.001  0.724  1.0
  O  O13  1  0.317  0.958  0.244  1.0
  O  O14  1  0.233  0.250  0.991  1.0
  O  O15  1  0.182  0.250  0.515  1.0
  O  O16  1  0.317  0.542  0.244  1.0
  O  O17  1  0.670  0.250  0.318  1.0
  O  O18  1  0.321  0.750  0.713  1.0
[/CIF]
.