NaMg6Y crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4); four equivalent Mg(1); four Mg(2,2); and two equivalent Y(1) atoms to form NaY2Mg10 cuboctahedra that share corners with four equivalent Y(1)Na2Mg10 cuboctahedra; corners with six equivalent Na(1)Y2Mg10 cuboctahedra; edges with two equivalent Y(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with eight Mg(2,2)Na2Y2Mg8 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra; and faces with six equivalent Mg(3)Y2Mg10 cuboctahedra. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms. In the second Mg site, Mg(2) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms to form distorted MgNa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with four equivalent Mg(3)Y2Mg10 cuboctahedra; corners with ten Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with two equivalent Mg(2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(3)Y2Mg10 cuboctahedra; edges with four equivalent Na(1)Y2Mg10 cuboctahedra; edges with four equivalent Y(1)Na2Mg10 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; and faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra. In the third Mg site, Mg(2) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms to form distorted MgNa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with four equivalent Mg(3)Y2Mg10 cuboctahedra; corners with ten Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with two equivalent Mg(2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(3)Y2Mg10 cuboctahedra; edges with four equivalent Na(1)Y2Mg10 cuboctahedra; edges with four equivalent Y(1)Na2Mg10 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; and faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra. In the fourth Mg site, Mg(3) is bonded to two equivalent Mg(4); four equivalent Mg(1); four Mg(2,2); and two equivalent Y(1) atoms to form MgY2Mg10 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with six equivalent Mg(3)Y2Mg10 cuboctahedra; corners with eight Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with four equivalent Y(1)Na2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra; and faces with six equivalent Na(1)Y2Mg10 cuboctahedra. In the fifth Mg site, Mg(4) is bonded to two equivalent Na(1); two equivalent Mg(3); four equivalent Mg(1); and four Mg(2,2) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Mg(3)Y2Mg10 cuboctahedra; corners with six equivalent Mg(4)Na2Mg10 cuboctahedra; corners with eight Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(3)Y2Mg10 cuboctahedra; edges with four equivalent Na(1)Y2Mg10 cuboctahedra; edges with four Mg(2,2)Na2Y2Mg8 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra; and faces with six equivalent Y(1)Na2Mg10 cuboctahedra. Y(1) is bonded to two equivalent Na(1); two equivalent Mg(3); four equivalent Mg(1); and four Mg(2,2) atoms to form YNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Y2Mg10 cuboctahedra; corners with six equivalent Y(1)Na2Mg10 cuboctahedra; edges with two equivalent Na(1)Y2Mg10 cuboctahedra; edges with four equivalent Mg(3)Y2Mg10 cuboctahedra; edges with eight Mg(2,2)Na2Y2Mg8 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra; and faces with six equivalent Mg(4)Na2Mg10 cuboctahedra.
NaMg6Y crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4); four equivalent Mg(1); four Mg(2,2); and two equivalent Y(1) atoms to form NaY2Mg10 cuboctahedra that share corners with four equivalent Y(1)Na2Mg10 cuboctahedra; corners with six equivalent Na(1)Y2Mg10 cuboctahedra; edges with two equivalent Y(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with eight Mg(2,2)Na2Y2Mg8 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra; and faces with six equivalent Mg(3)Y2Mg10 cuboctahedra. Both Na(1)-Mg(4) bond lengths are 3.28 Å. There are two shorter (3.29 Å) and two longer (3.40 Å) Na(1)-Mg(1) bond lengths. All Na(1)-Mg(2,2) bond lengths are 3.27 Å. Both Na(1)-Y(1) bond lengths are 3.40 Å. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms. There is one shorter (3.32 Å) and one longer (3.47 Å) Mg(1)-Mg(1) bond length. Both Mg(1)-Mg(2) bond lengths are 3.21 Å. Both Mg(1)-Mg(3) bond lengths are 3.25 Å. Both Mg(1)-Mg(4) bond lengths are 3.28 Å. There is one shorter (3.32 Å) and one longer (3.37 Å) Mg(1)-Y(1) bond length. In the second Mg site, Mg(2) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms to form distorted MgNa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with four equivalent Mg(3)Y2Mg10 cuboctahedra; corners with ten Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with two equivalent Mg(2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(3)Y2Mg10 cuboctahedra; edges with four equivalent Na(1)Y2Mg10 cuboctahedra; edges with four equivalent Y(1)Na2Mg10 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; and faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra. There is one shorter (3.39 Å) and one longer (3.40 Å) Mg(2)-Mg(2) bond length. There is one shorter (3.29 Å) and one longer (3.41 Å) Mg(2)-Mg(3) bond length. There is one shorter (3.28 Å) and one longer (3.41 Å) Mg(2)-Mg(4) bond length. Both Mg(2)-Y(1) bond lengths are 3.27 Å. In the third Mg site, Mg(2) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms to form distorted MgNa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with four equivalent Mg(3)Y2Mg10 cuboctahedra; corners with ten Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with two equivalent Mg(2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(3)Y2Mg10 cuboctahedra; edges with four equivalent Na(1)Y2Mg10 cuboctahedra; edges with four equivalent Y(1)Na2Mg10 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; and faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra. Both Mg(2)-Mg(1) bond lengths are 3.21 Å. There is one shorter (3.29 Å) and one longer (3.41 Å) Mg(2)-Mg(3) bond length. There is one shorter (3.28 Å) and one longer (3.41 Å) Mg(2)-Mg(4) bond length. Both Mg(2)-Y(1) bond lengths are 3.27 Å. In the fourth Mg site, Mg(3) is bonded to two equivalent Mg(4); four equivalent Mg(1); four Mg(2,2); and two equivalent Y(1) atoms to form MgY2Mg10 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with six equivalent Mg(3)Y2Mg10 cuboctahedra; corners with eight Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with four equivalent Y(1)Na2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra; and faces with six equivalent Na(1)Y2Mg10 cuboctahedra. Both Mg(3)-Mg(4) bond lengths are 3.40 Å. Both Mg(3)-Y(1) bond lengths are 3.28 Å. In the fifth Mg site, Mg(4) is bonded to two equivalent Na(1); two equivalent Mg(3); four equivalent Mg(1); and four Mg(2,2) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Mg(3)Y2Mg10 cuboctahedra; corners with six equivalent Mg(4)Na2Mg10 cuboctahedra; corners with eight Mg(2,2)Na2Y2Mg8 cuboctahedra; edges with two equivalent Mg(3)Y2Mg10 cuboctahedra; edges with four equivalent Na(1)Y2Mg10 cuboctahedra; edges with four Mg(2,2)Na2Y2Mg8 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra; and faces with six equivalent Y(1)Na2Mg10 cuboctahedra. Y(1) is bonded to two equivalent Na(1); two equivalent Mg(3); four equivalent Mg(1); and four Mg(2,2) atoms to form YNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Y2Mg10 cuboctahedra; corners with six equivalent Y(1)Na2Mg10 cuboctahedra; edges with two equivalent Na(1)Y2Mg10 cuboctahedra; edges with four equivalent Mg(3)Y2Mg10 cuboctahedra; edges with eight Mg(2,2)Na2Y2Mg8 cuboctahedra; faces with two equivalent Na(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(3)Y2Mg10 cuboctahedra; faces with two equivalent Y(1)Na2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Y2Mg8 cuboctahedra; and faces with six equivalent Mg(4)Na2Mg10 cuboctahedra.