The structure described by RbMg14Y crystallizes in the hexagonal P-6m2 space group. Rb(1) is bonded to six Mg(2,2) and six equivalent Mg(3) atoms to form RbMg12 cuboctahedra that share corners with six equivalent Rb(1)Mg12 cuboctahedra; corners with twelve Mg(1,1)Y2Mg10 cuboctahedra; edges with six Mg(2,2)Rb2Mg10 cuboctahedra; faces with two equivalent Y(1)Mg12 cuboctahedra; faces with six equivalent Mg(4)Mg12 cuboctahedra; and faces with six Mg(2,2)Rb2Mg10 cuboctahedra. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(4); four Mg(1,1); four equivalent Mg(3); and two equivalent Y(1) atoms to form MgY2Mg10 cuboctahedra that share corners with four equivalent Rb(1)Mg12 cuboctahedra; corners with six equivalent Mg(1)Y2Mg10 cuboctahedra; corners with eight Mg(2,2)Rb2Mg10 cuboctahedra; edges with two equivalent Y(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four Mg(1,1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(2)Rb2Mg10 cuboctahedra; faces with two equivalent Y(1)Mg12 cuboctahedra; and faces with four Mg(1,1)Y2Mg10 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Rb(1); two equivalent Mg(4); four Mg(2,2); and four equivalent Mg(3) atoms to form distorted MgRb2Mg10 cuboctahedra that share corners with four equivalent Y(1)Mg12 cuboctahedra; corners with six equivalent Mg(2)Rb2Mg10 cuboctahedra; corners with eight Mg(1,1)Y2Mg10 cuboctahedra; edges with two equivalent Rb(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four Mg(2,2)Rb2Mg10 cuboctahedra; faces with two equivalent Rb(1)Mg12 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(1)Y2Mg10 cuboctahedra; and faces with four Mg(2,2)Rb2Mg10 cuboctahedra. In the third Mg site, Mg(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Y(1) atoms to form MgY2Mg10 cuboctahedra that share corners with four equivalent Rb(1)Mg12 cuboctahedra; corners with six equivalent Mg(1)Y2Mg10 cuboctahedra; corners with eight Mg(2,2)Rb2Mg10 cuboctahedra; edges with two equivalent Y(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four equivalent Mg(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(2)Rb2Mg10 cuboctahedra; faces with two equivalent Y(1)Mg12 cuboctahedra; and faces with four equivalent Mg(1)Y2Mg10 cuboctahedra. In the fourth Mg site, Mg(2) is bonded to two equivalent Rb(1), two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms to form distorted MgRb2Mg10 cuboctahedra that share corners with four equivalent Y(1)Mg12 cuboctahedra; corners with six equivalent Mg(2)Rb2Mg10 cuboctahedra; corners with eight Mg(1,1)Y2Mg10 cuboctahedra; edges with two equivalent Rb(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four equivalent Mg(2)Rb2Mg10 cuboctahedra; faces with two equivalent Rb(1)Mg12 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(1)Y2Mg10 cuboctahedra; and faces with four equivalent Mg(2)Rb2Mg10 cuboctahedra. In the fifth Mg site, Mg(3) is bonded in a 12-coordinate geometry to one Rb(1); two Mg(1,1); two equivalent Mg(2); two equivalent Mg(4); four equivalent Mg(3); and one Y(1) atom. In the sixth Mg site, Mg(4) is bonded to three Mg(1,1); three Mg(2,2); and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra; edges with six Mg(2,2)Rb2Mg10 cuboctahedra; edges with six Mg(1,1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with three equivalent Rb(1)Mg12 cuboctahedra; faces with three Mg(2,2)Rb2Mg10 cuboctahedra; faces with three Mg(1,1)Y2Mg10 cuboctahedra; and faces with three equivalent Y(1)Mg12 cuboctahedra. Y(1) is bonded to six Mg(1,1) and six equivalent Mg(3) atoms to form YMg12 cuboctahedra that share corners with six equivalent Y(1)Mg12 cuboctahedra; corners with twelve Mg(2,2)Rb2Mg10 cuboctahedra; edges with six Mg(1,1)Y2Mg10 cuboctahedra; faces with two equivalent Rb(1)Mg12 cuboctahedra; faces with six equivalent Mg(4)Mg12 cuboctahedra; and faces with six Mg(1,1)Y2Mg10 cuboctahedra. is represented by the CIF file [CIF]
data_RbYMg14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.737
_cell_length_b   6.737
_cell_length_c   10.523
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   413.583
_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  0.167  0.333  0.625  1.0
  Y  Y1  1  0.167  0.333  0.125  1.0
  Mg  Mg2  1  0.173  0.837  0.125  1.0
  Mg  Mg3  1  0.171  0.836  0.625  1.0
  Mg  Mg4  1  0.663  0.327  0.125  1.0
  Mg  Mg5  1  0.664  0.329  0.625  1.0
  Mg  Mg6  1  0.663  0.837  0.125  1.0
  Mg  Mg7  1  0.664  0.836  0.625  1.0
  Mg  Mg8  1  0.340  0.160  0.367  1.0
  Mg  Mg9  1  0.340  0.160  0.883  1.0
  Mg  Mg10  1  0.340  0.680  0.367  1.0
  Mg  Mg11  1  0.340  0.680  0.883  1.0
  Mg  Mg12  1  0.820  0.160  0.367  1.0
  Mg  Mg13  1  0.820  0.160  0.883  1.0
  Mg  Mg14  1  0.833  0.667  0.376  1.0
  Mg  Mg15  1  0.833  0.667  0.874  1.0
[/CIF]
.
The structure described by RbMg14Y crystallizes in the hexagonal P-6m2 space group. Rb(1) is bonded to six Mg(2,2) and six equivalent Mg(3) atoms to form RbMg12 cuboctahedra that share corners with six equivalent Rb(1)Mg12 cuboctahedra; corners with twelve Mg(1,1)Y2Mg10 cuboctahedra; edges with six Mg(2,2)Rb2Mg10 cuboctahedra; faces with two equivalent Y(1)Mg12 cuboctahedra; faces with six equivalent Mg(4)Mg12 cuboctahedra; and faces with six Mg(2,2)Rb2Mg10 cuboctahedra. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(4); four Mg(1,1); four equivalent Mg(3); and two equivalent Y(1) atoms to form MgY2Mg10 cuboctahedra that share corners with four equivalent Rb(1)Mg12 cuboctahedra; corners with six equivalent Mg(1)Y2Mg10 cuboctahedra; corners with eight Mg(2,2)Rb2Mg10 cuboctahedra; edges with two equivalent Y(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four Mg(1,1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(2)Rb2Mg10 cuboctahedra; faces with two equivalent Y(1)Mg12 cuboctahedra; and faces with four Mg(1,1)Y2Mg10 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Rb(1); two equivalent Mg(4); four Mg(2,2); and four equivalent Mg(3) atoms to form distorted MgRb2Mg10 cuboctahedra that share corners with four equivalent Y(1)Mg12 cuboctahedra; corners with six equivalent Mg(2)Rb2Mg10 cuboctahedra; corners with eight Mg(1,1)Y2Mg10 cuboctahedra; edges with two equivalent Rb(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four Mg(2,2)Rb2Mg10 cuboctahedra; faces with two equivalent Rb(1)Mg12 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(1)Y2Mg10 cuboctahedra; and faces with four Mg(2,2)Rb2Mg10 cuboctahedra. In the third Mg site, Mg(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Y(1) atoms to form MgY2Mg10 cuboctahedra that share corners with four equivalent Rb(1)Mg12 cuboctahedra; corners with six equivalent Mg(1)Y2Mg10 cuboctahedra; corners with eight Mg(2,2)Rb2Mg10 cuboctahedra; edges with two equivalent Y(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four equivalent Mg(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(2)Rb2Mg10 cuboctahedra; faces with two equivalent Y(1)Mg12 cuboctahedra; and faces with four equivalent Mg(1)Y2Mg10 cuboctahedra. In the fourth Mg site, Mg(2) is bonded to two equivalent Rb(1), two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms to form distorted MgRb2Mg10 cuboctahedra that share corners with four equivalent Y(1)Mg12 cuboctahedra; corners with six equivalent Mg(2)Rb2Mg10 cuboctahedra; corners with eight Mg(1,1)Y2Mg10 cuboctahedra; edges with two equivalent Rb(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four equivalent Mg(2)Rb2Mg10 cuboctahedra; faces with two equivalent Rb(1)Mg12 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(1)Y2Mg10 cuboctahedra; and faces with four equivalent Mg(2)Rb2Mg10 cuboctahedra. In the fifth Mg site, Mg(3) is bonded in a 12-coordinate geometry to one Rb(1); two Mg(1,1); two equivalent Mg(2); two equivalent Mg(4); four equivalent Mg(3); and one Y(1) atom. In the sixth Mg site, Mg(4) is bonded to three Mg(1,1); three Mg(2,2); and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra; edges with six Mg(2,2)Rb2Mg10 cuboctahedra; edges with six Mg(1,1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with three equivalent Rb(1)Mg12 cuboctahedra; faces with three Mg(2,2)Rb2Mg10 cuboctahedra; faces with three Mg(1,1)Y2Mg10 cuboctahedra; and faces with three equivalent Y(1)Mg12 cuboctahedra. Y(1) is bonded to six Mg(1,1) and six equivalent Mg(3) atoms to form YMg12 cuboctahedra that share corners with six equivalent Y(1)Mg12 cuboctahedra; corners with twelve Mg(2,2)Rb2Mg10 cuboctahedra; edges with six Mg(1,1)Y2Mg10 cuboctahedra; faces with two equivalent Rb(1)Mg12 cuboctahedra; faces with six equivalent Mg(4)Mg12 cuboctahedra; and faces with six Mg(1,1)Y2Mg10 cuboctahedra. is represented by the CIF file [CIF]
data_RbYMg14
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.737
_cell_length_b   6.737
_cell_length_c   10.523
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   413.583
_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  0.167  0.333  0.625  1.0
  Y  Y1  1  0.167  0.333  0.125  1.0
  Mg  Mg2  1  0.173  0.837  0.125  1.0
  Mg  Mg3  1  0.171  0.836  0.625  1.0
  Mg  Mg4  1  0.663  0.327  0.125  1.0
  Mg  Mg5  1  0.664  0.329  0.625  1.0
  Mg  Mg6  1  0.663  0.837  0.125  1.0
  Mg  Mg7  1  0.664  0.836  0.625  1.0
  Mg  Mg8  1  0.340  0.160  0.367  1.0
  Mg  Mg9  1  0.340  0.160  0.883  1.0
  Mg  Mg10  1  0.340  0.680  0.367  1.0
  Mg  Mg11  1  0.340  0.680  0.883  1.0
  Mg  Mg12  1  0.820  0.160  0.367  1.0
  Mg  Mg13  1  0.820  0.160  0.883  1.0
  Mg  Mg14  1  0.833  0.667  0.376  1.0
  Mg  Mg15  1  0.833  0.667  0.874  1.0
[/CIF]
.