The material structure described by MgNbBi3O7 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(3), one O(4), one O(5), and two equivalent O(6) atoms to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Nb(1)O5 trigonal bipyramid, corners with two equivalent Mg(1)O5 trigonal bipyramids, and edges with two equivalent Nb(1)O5 trigonal bipyramids. Nb(1) is bonded to one O(1), one O(4), one O(6), and two equivalent O(3) atoms to form distorted NbO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O5 trigonal bipyramid, corners with two equivalent Nb(1)O5 trigonal bipyramids, and edges with two equivalent Mg(1)O5 trigonal bipyramids. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in an L-shaped geometry to one O(2) and one O(7) atom. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. In the third Bi site, Bi(3) is bonded in a distorted T-shaped geometry to one O(7) and two equivalent O(5) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Nb(1) and two equivalent Bi(2) atoms. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1) and two equivalent Bi(2) atoms. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Mg(1) and one Nb(1) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Mg(1) and two equivalent Bi(3) atoms. In the sixth O site, O(6) is bonded in a T-shaped geometry to two equivalent Mg(1) and one Nb(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Bi(1) and one Bi(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgNbBi3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.961
_cell_length_b   4.907
_cell_length_c   18.375
_cell_angle_alpha   47.812
_cell_angle_beta   46.274
_cell_angle_gamma   46.334
_symmetry_Int_Tables_number   1
_cell_volume   217.092
_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  0.479  0.421  0.629  1.0
  Nb  Nb1  1  0.025  0.927  0.492  1.0
  Bi  Bi2  1  0.996  0.719  0.045  1.0
  Bi  Bi3  1  0.025  0.038  0.265  1.0
  Bi  Bi4  1  0.913  0.924  0.795  1.0
  O  O5  1  0.331  0.193  0.346  1.0
  O  O6  1  0.811  0.719  0.191  1.0
  O  O7  1  0.478  0.388  0.524  1.0
  O  O8  1  0.826  0.720  0.493  1.0
  O  O9  1  0.331  0.316  0.777  1.0
  O  O10  1  0.907  0.846  0.636  1.0
  O  O11  1  0.619  0.683  0.963  1.0
[/CIF]
.
The material structure described by MgNbBi3O7 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(3), one O(4), one O(5), and two equivalent O(6) atoms to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Nb(1)O5 trigonal bipyramid, corners with two equivalent Mg(1)O5 trigonal bipyramids, and edges with two equivalent Nb(1)O5 trigonal bipyramids. Nb(1) is bonded to one O(1), one O(4), one O(6), and two equivalent O(3) atoms to form distorted NbO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O5 trigonal bipyramid, corners with two equivalent Nb(1)O5 trigonal bipyramids, and edges with two equivalent Mg(1)O5 trigonal bipyramids. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in an L-shaped geometry to one O(2) and one O(7) atom. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. In the third Bi site, Bi(3) is bonded in a distorted T-shaped geometry to one O(7) and two equivalent O(5) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Nb(1) and two equivalent Bi(2) atoms. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Bi(1) and two equivalent Bi(2) atoms. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Mg(1) and one Nb(1) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Mg(1) and two equivalent Bi(3) atoms. In the sixth O site, O(6) is bonded in a T-shaped geometry to two equivalent Mg(1) and one Nb(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Bi(1) and one Bi(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgNbBi3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.961
_cell_length_b   4.907
_cell_length_c   18.375
_cell_angle_alpha   47.812
_cell_angle_beta   46.274
_cell_angle_gamma   46.334
_symmetry_Int_Tables_number   1
_cell_volume   217.092
_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  0.479  0.421  0.629  1.0
  Nb  Nb1  1  0.025  0.927  0.492  1.0
  Bi  Bi2  1  0.996  0.719  0.045  1.0
  Bi  Bi3  1  0.025  0.038  0.265  1.0
  Bi  Bi4  1  0.913  0.924  0.795  1.0
  O  O5  1  0.331  0.193  0.346  1.0
  O  O6  1  0.811  0.719  0.191  1.0
  O  O7  1  0.478  0.388  0.524  1.0
  O  O8  1  0.826  0.720  0.493  1.0
  O  O9  1  0.331  0.316  0.777  1.0
  O  O10  1  0.907  0.846  0.636  1.0
  O  O11  1  0.619  0.683  0.963  1.0
[/CIF]
.