The material structure described by RbMg6Nb crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form RbMg12 cuboctahedra that share corners with six equivalent Rb(1)Mg12 cuboctahedra, faces with two equivalent Rb(1)Mg12 cuboctahedra, and faces with six equivalent Nb(1)Mg12 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Rb(1), one Mg(1), one Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Nb(1) atoms. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent Mg(1), four equivalent Mg(3), and two equivalent Nb(1) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Rb(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Nb(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Rb(1), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Nb(1) atoms. Nb(1) is bonded to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form NbMg12 cuboctahedra that share corners with six equivalent Nb(1)Mg12 cuboctahedra, faces with two equivalent Nb(1)Mg12 cuboctahedra, and faces with six equivalent Rb(1)Mg12 cuboctahedra. is represented by the CIF file [CIF]
data_RbMg6Nb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.579
_cell_length_b   6.579
_cell_length_c   5.159
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   118.649
_symmetry_Int_Tables_number   1
_cell_volume   195.970
_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
  Rb  Rb0  1  0.913  0.087  0.000  1.0
  Mg  Mg1  1  0.881  0.572  0.000  1.0
  Mg  Mg2  1  0.428  0.119  0.000  1.0
  Mg  Mg3  1  0.426  0.574  0.000  1.0
  Mg  Mg4  1  0.567  0.897  0.500  1.0
  Mg  Mg5  1  0.103  0.433  0.500  1.0
  Mg  Mg6  1  0.099  0.901  0.500  1.0
  Nb  Nb7  1  0.583  0.417  0.500  1.0
[/CIF]
.
The material structure described by RbMg6Nb crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form RbMg12 cuboctahedra that share corners with six equivalent Rb(1)Mg12 cuboctahedra, faces with two equivalent Rb(1)Mg12 cuboctahedra, and faces with six equivalent Nb(1)Mg12 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Rb(1), one Mg(1), one Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Nb(1) atoms. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent Mg(1), four equivalent Mg(3), and two equivalent Nb(1) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Rb(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Nb(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Rb(1), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Nb(1) atoms. Nb(1) is bonded to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form NbMg12 cuboctahedra that share corners with six equivalent Nb(1)Mg12 cuboctahedra, faces with two equivalent Nb(1)Mg12 cuboctahedra, and faces with six equivalent Rb(1)Mg12 cuboctahedra. is represented by the CIF file [CIF]
data_RbMg6Nb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.579
_cell_length_b   6.579
_cell_length_c   5.159
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   118.649
_symmetry_Int_Tables_number   1
_cell_volume   195.970
_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
  Rb  Rb0  1  0.913  0.087  0.000  1.0
  Mg  Mg1  1  0.881  0.572  0.000  1.0
  Mg  Mg2  1  0.428  0.119  0.000  1.0
  Mg  Mg3  1  0.426  0.574  0.000  1.0
  Mg  Mg4  1  0.567  0.897  0.500  1.0
  Mg  Mg5  1  0.103  0.433  0.500  1.0
  Mg  Mg6  1  0.099  0.901  0.500  1.0
  Nb  Nb7  1  0.583  0.417  0.500  1.0
[/CIF]
.