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.
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. All Rb(1)-Mg(2,2) bond lengths are 3.37 Å. All Rb(1)-Mg(3) bond lengths are 3.38 Å. 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. Both Mg(1)-Mg(4) bond lengths are 3.30 Å. There are two shorter (3.30 Å) and two longer (3.43 Å) Mg(1)-Mg(1,1) bond lengths. All Mg(1)-Mg(3) bond lengths are 3.17 Å. Both Mg(1)-Y(1) bond lengths are 3.37 Å. 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. Both Mg(2)-Mg(4) bond lengths are 3.28 Å. There are two shorter (3.32 Å) and two longer (3.42 Å) Mg(2)-Mg(2,2) bond lengths. All Mg(2)-Mg(3) bond lengths are 3.31 Å. 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. Both Mg(1)-Mg(4) bond lengths are 3.30 Å. All Mg(1)-Mg(3) bond lengths are 3.17 Å. Both Mg(1)-Y(1) bond lengths are 3.37 Å. 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. Both Mg(2)-Mg(4) bond lengths are 3.28 Å. All Mg(2)-Mg(3) bond lengths are 3.31 Å. 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. Both Mg(3)-Mg(4) bond lengths are 3.37 Å. There are two shorter (3.24 Å) and two longer (3.50 Å) Mg(3)-Mg(3) bond lengths. The Mg(3)-Y(1) bond length is 3.25 Å. 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.