The structure described by RbMg14B crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Mg(6), four equivalent Mg(3), four equivalent Mg(5), and two equivalent B(1) atoms to form RbMg10B2 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra, corners with six equivalent Rb(1)Mg10B2 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, and faces with two equivalent Mg(1)Mg12 cuboctahedra. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Rb(1)Mg10B2 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(4)Mg12 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Rb(1)Mg10B2 cuboctahedra, corners with six equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, and faces with four equivalent Mg(4)Mg12 cuboctahedra. In the third Mg site, Mg(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one B(1) atom. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form distorted MgMg12 cuboctahedra that share corners with four equivalent Rb(1)Mg10B2 cuboctahedra, corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with two equivalent Mg(4)Mg12 cuboctahedra. In the fifth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Rb(1), one Mg(1), one Mg(2), and one Mg(4) atom. In the sixth Mg site, Mg(6) is bonded in a 1-coordinate geometry to one Rb(1), one Mg(1), and two equivalent Mg(4) atoms. In the seventh Mg site, Mg(7) is bonded in a 13-coordinate geometry to one Mg(2) and two equivalent Mg(4) atoms. B(1) is bonded in a distorted L-shaped geometry to two equivalent Rb(1) and two equivalent Mg(3) atoms. is represented by the CIF card [CIF]
data_RbMg14B
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.684
_cell_length_b   6.314
_cell_length_c   10.299
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   118.188
_symmetry_Int_Tables_number   1
_cell_volume   383.132
_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  0.105  0.302  0.125  1.0
  Mg  Mg1  1  0.172  0.336  0.625  1.0
  Mg  Mg2  1  0.157  0.828  0.625  1.0
  Mg  Mg3  1  0.609  0.302  0.125  1.0
  Mg  Mg4  1  0.658  0.335  0.625  1.0
  Mg  Mg5  1  0.609  0.807  0.125  1.0
  Mg  Mg6  1  0.658  0.823  0.625  1.0
  Mg  Mg7  1  0.341  0.158  0.377  1.0
  Mg  Mg8  1  0.341  0.158  0.873  1.0
  Mg  Mg9  1  0.341  0.683  0.377  1.0
  Mg  Mg10  1  0.341  0.683  0.873  1.0
  Mg  Mg11  1  0.819  0.159  0.397  1.0
  Mg  Mg12  1  0.819  0.159  0.853  1.0
  Mg  Mg13  1  0.859  0.679  0.348  1.0
  Mg  Mg14  1  0.859  0.679  0.902  1.0
  B  B15  1  0.311  0.905  0.125  1.0
[/CIF]
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The structure described by RbMg14B crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Mg(6), four equivalent Mg(3), four equivalent Mg(5), and two equivalent B(1) atoms to form RbMg10B2 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra, corners with six equivalent Rb(1)Mg10B2 cuboctahedra, corners with eight equivalent Mg(4)Mg12 cuboctahedra, and faces with two equivalent Mg(1)Mg12 cuboctahedra. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(2), two equivalent Mg(6), four equivalent Mg(4), and four equivalent Mg(5) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Rb(1)Mg10B2 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with four equivalent Mg(4)Mg12 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(7), four equivalent Mg(4), and four equivalent Mg(5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Rb(1)Mg10B2 cuboctahedra, corners with six equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, and faces with four equivalent Mg(4)Mg12 cuboctahedra. In the third Mg site, Mg(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one B(1) atom. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), two equivalent Mg(6), and two equivalent Mg(7) atoms to form distorted MgMg12 cuboctahedra that share corners with four equivalent Rb(1)Mg10B2 cuboctahedra, corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with two equivalent Mg(1)Mg12 cuboctahedra, edges with two equivalent Mg(2)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(1)Mg12 cuboctahedra, faces with two equivalent Mg(2)Mg12 cuboctahedra, and faces with two equivalent Mg(4)Mg12 cuboctahedra. In the fifth Mg site, Mg(5) is bonded in a 12-coordinate geometry to one Rb(1), one Mg(1), one Mg(2), and one Mg(4) atom. In the sixth Mg site, Mg(6) is bonded in a 1-coordinate geometry to one Rb(1), one Mg(1), and two equivalent Mg(4) atoms. In the seventh Mg site, Mg(7) is bonded in a 13-coordinate geometry to one Mg(2) and two equivalent Mg(4) atoms. B(1) is bonded in a distorted L-shaped geometry to two equivalent Rb(1) and two equivalent Mg(3) atoms. is represented by the CIF card [CIF]
data_RbMg14B
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.684
_cell_length_b   6.314
_cell_length_c   10.299
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   118.188
_symmetry_Int_Tables_number   1
_cell_volume   383.132
_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  0.105  0.302  0.125  1.0
  Mg  Mg1  1  0.172  0.336  0.625  1.0
  Mg  Mg2  1  0.157  0.828  0.625  1.0
  Mg  Mg3  1  0.609  0.302  0.125  1.0
  Mg  Mg4  1  0.658  0.335  0.625  1.0
  Mg  Mg5  1  0.609  0.807  0.125  1.0
  Mg  Mg6  1  0.658  0.823  0.625  1.0
  Mg  Mg7  1  0.341  0.158  0.377  1.0
  Mg  Mg8  1  0.341  0.158  0.873  1.0
  Mg  Mg9  1  0.341  0.683  0.377  1.0
  Mg  Mg10  1  0.341  0.683  0.873  1.0
  Mg  Mg11  1  0.819  0.159  0.397  1.0
  Mg  Mg12  1  0.819  0.159  0.853  1.0
  Mg  Mg13  1  0.859  0.679  0.348  1.0
  Mg  Mg14  1  0.859  0.679  0.902  1.0
  B  B15  1  0.311  0.905  0.125  1.0
[/CIF]
.