CaMg14Y crystallizes in the orthorhombic Amm2 space group. Ca(1) is bonded to two equivalent Mg(6); four Mg(3,3); four Mg(5,5); and two equivalent Y(1) atoms to form CaY2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with six equivalent Ca(1)Y2Mg10 cuboctahedra; corners with eight equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra; edges with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with eight Mg(5,5)CaYMg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Y(1)Ca2Mg10 cuboctahedra; faces with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; and faces with six equivalent Mg(7)YMg11 cuboctahedra. There are nine 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 Mg(5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Y(1)Ca2Mg10 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with eight Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with eight Mg(5,5)CaYMg10 cuboctahedra; faces with two equivalent Ca(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; and faces with six equivalent Mg(7)YMg11 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 Mg(5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Ca(1)Y2Mg10 cuboctahedra; corners with six equivalent Mg(2)Mg12 cuboctahedra; corners with eight Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; edges with eight Mg(5,5)CaYMg10 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Y(1)Ca2Mg10 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; and faces with six equivalent Mg(6)CaMg11 cuboctahedra. In the third Mg site, Mg(3) is bonded to two equivalent Ca(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Y(1) atoms to form distorted MgCa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with four equivalent Mg(4)Mg12 cuboctahedra; corners with six Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four Mg(5,5)CaYMg10 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Ca(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Y(1)Ca2Mg10 cuboctahedra; and faces with eight Mg(5,5)CaYMg10 cuboctahedra. 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 MgMg12 cuboctahedra that share corners with four equivalent Ca(1)Y2Mg10 cuboctahedra; corners with four equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; corners with four equivalent Y(1)Ca2Mg10 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; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four Mg(5,5)CaYMg10 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; and faces with eight Mg(5,5)CaYMg10 cuboctahedra. In the fifth Mg site, Mg(3) is bonded to two equivalent Ca(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Y(1) atoms to form distorted MgCa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with four equivalent Mg(4)Mg12 cuboctahedra; corners with six equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four equivalent Mg(5)CaYMg10 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Ca(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Y(1)Ca2Mg10 cuboctahedra; and faces with eight Mg(5,5)CaYMg10 cuboctahedra. In the sixth Mg site, Mg(5) is bonded to one Ca(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and one Y(1) atom to form distorted MgCaYMg10 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra; corners with four equivalent Mg(7)YMg11 cuboctahedra; corners with ten Mg(5,5)CaYMg10 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Mg(6)CaMg11 cuboctahedra; edges with two equivalent Mg(5)CaYMg10 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; edges with two equivalent Mg(7)YMg11 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra;  a faceface with one Ca(1)Y2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra;  a faceface with one Y(1)Ca2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; and faces with four equivalent Mg(4)Mg12 cuboctahedra. In the seventh Mg site, Mg(5) is bonded to one Ca(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and one Y(1) atom to form distorted MgCaYMg10 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra; corners with four equivalent Mg(7)YMg11 cuboctahedra; corners with ten Mg(5,5)CaYMg10 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Mg(6)CaMg11 cuboctahedra; edges with two equivalent Mg(5)CaYMg10 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; edges with two equivalent Mg(7)YMg11 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra;  a faceface with one Ca(1)Y2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra;  a faceface with one Y(1)Ca2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; and faces with four equivalent Mg(4)Mg12 cuboctahedra. In the eighth Mg site, Mg(6) is bonded to one Ca(1); one Mg(1); two Mg(3,3); two equivalent Mg(4); two equivalent Mg(7); and four Mg(5,5) atoms to form distorted MgCaMg11 cuboctahedra that share corners with four equivalent Mg(7)YMg11 cuboctahedra; corners with six equivalent Mg(6)CaMg11 cuboctahedra; corners with eight Mg(5,5)CaYMg10 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Mg(7)YMg11 cuboctahedra; edges with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with four Mg(5,5)CaYMg10 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra;  a faceface with one Ca(1)Y2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra; faces with two Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with three equivalent Mg(2)Mg12 cuboctahedra; faces with three equivalent Y(1)Ca2Mg10 cuboctahedra; and faces with four Mg(5,5)CaYMg10 cuboctahedra. In the ninth Mg site, Mg(7) is bonded to one Mg(2); two Mg(3,3); two equivalent Mg(4); two equivalent Mg(6); four Mg(5,5); and one Y(1) atom to form MgYMg11 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra; corners with six equivalent Mg(7)YMg11 cuboctahedra; corners with eight Mg(5,5)CaYMg10 cuboctahedra; edges with two equivalent Mg(6)CaMg11 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra; edges with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with four Mg(5,5)CaYMg10 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra;  a faceface with one Y(1)Ca2Mg10 cuboctahedra; faces with two Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with three equivalent Ca(1)Y2Mg10 cuboctahedra; faces with three equivalent Mg(1)Mg12 cuboctahedra; and faces with four Mg(5,5)CaYMg10 cuboctahedra. Y(1) is bonded to two equivalent Ca(1); two equivalent Mg(7); four Mg(3,3); and four Mg(5,5) atoms to form YCa2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Y(1)Ca2Mg10 cuboctahedra; corners with eight equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; edges with eight Mg(5,5)CaYMg10 cuboctahedra; faces with two equivalent Ca(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; and faces with six equivalent Mg(6)CaMg11 cuboctahedra.
CaMg14Y crystallizes in the orthorhombic Amm2 space group. Ca(1) is bonded to two equivalent Mg(6); four Mg(3,3); four Mg(5,5); and two equivalent Y(1) atoms to form CaY2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with six equivalent Ca(1)Y2Mg10 cuboctahedra; corners with eight equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra; edges with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with eight Mg(5,5)CaYMg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Y(1)Ca2Mg10 cuboctahedra; faces with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; and faces with six equivalent Mg(7)YMg11 cuboctahedra. Both Ca(1)-Mg(6) bond lengths are 3.32 Å. There are two shorter (3.26 Å) and two longer (3.35 Å) Ca(1)-Mg(3,3) bond lengths. All Ca(1)-Mg(5,5) bond lengths are 3.33 Å. Both Ca(1)-Y(1) bond lengths are 3.30 Å. There are nine 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 Mg(5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Y(1)Ca2Mg10 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with eight Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with eight Mg(5,5)CaYMg10 cuboctahedra; faces with two equivalent Ca(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; and faces with six equivalent Mg(7)YMg11 cuboctahedra. Both Mg(1)-Mg(2) bond lengths are 3.30 Å. Both Mg(1)-Mg(6) bond lengths are 3.23 Å. There are two shorter (3.29 Å) and two longer (3.31 Å) Mg(1)-Mg(4) bond lengths. All Mg(1)-Mg(5,5) bond lengths are 3.19 Å. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1); two equivalent Mg(7); four equivalent Mg(4); and four Mg(5,5) atoms to form MgMg12 cuboctahedra that share corners with four equivalent Ca(1)Y2Mg10 cuboctahedra; corners with six equivalent Mg(2)Mg12 cuboctahedra; corners with eight Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; edges with eight Mg(5,5)CaYMg10 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Y(1)Ca2Mg10 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; faces with four equivalent Mg(4)Mg12 cuboctahedra; and faces with six equivalent Mg(6)CaMg11 cuboctahedra. Both Mg(2)-Mg(7) bond lengths are 3.23 Å. There are two shorter (3.29 Å) and two longer (3.31 Å) Mg(2)-Mg(4) bond lengths. All Mg(2)-Mg(5,5) bond lengths are 3.18 Å. In the third Mg site, Mg(3) is bonded to two equivalent Ca(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Y(1) atoms to form distorted MgCa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with four equivalent Mg(4)Mg12 cuboctahedra; corners with six Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four Mg(5,5)CaYMg10 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Ca(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Y(1)Ca2Mg10 cuboctahedra; and faces with eight Mg(5,5)CaYMg10 cuboctahedra. There is one shorter (3.27 Å) and one longer (3.33 Å) Mg(3)-Mg(3) bond length. Both Mg(3)-Mg(5) bond lengths are 3.30 Å. Both Mg(3)-Mg(6) bond lengths are 3.29 Å. Both Mg(3)-Mg(7) bond lengths are 3.27 Å. There is one shorter (3.26 Å) and one longer (3.35 Å) Mg(3)-Y(1) bond length. 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 MgMg12 cuboctahedra that share corners with four equivalent Ca(1)Y2Mg10 cuboctahedra; corners with four equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; corners with four equivalent Y(1)Ca2Mg10 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; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four Mg(5,5)CaYMg10 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(1)Mg12 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; and faces with eight Mg(5,5)CaYMg10 cuboctahedra. Both Mg(4)-Mg(4) bond lengths are 3.30 Å. Both Mg(4)-Mg(5) bond lengths are 3.17 Å. Both Mg(4)-Mg(6) bond lengths are 3.20 Å. Both Mg(4)-Mg(7) bond lengths are 3.22 Å. In the fifth Mg site, Mg(3) is bonded to two equivalent Ca(1), two equivalent Mg(3), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and two equivalent Y(1) atoms to form distorted MgCa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with four equivalent Mg(2)Mg12 cuboctahedra; corners with four equivalent Mg(4)Mg12 cuboctahedra; corners with six equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra; edges with four equivalent Mg(6)CaMg11 cuboctahedra; edges with four equivalent Mg(5)CaYMg10 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Ca(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with two equivalent Y(1)Ca2Mg10 cuboctahedra; and faces with eight Mg(5,5)CaYMg10 cuboctahedra. Both Mg(3)-Mg(5) bond lengths are 3.30 Å. Both Mg(3)-Mg(6) bond lengths are 3.29 Å. Both Mg(3)-Mg(7) bond lengths are 3.27 Å. There is one shorter (3.26 Å) and one longer (3.35 Å) Mg(3)-Y(1) bond length. In the sixth Mg site, Mg(5) is bonded to one Ca(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and one Y(1) atom to form distorted MgCaYMg10 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra; corners with four equivalent Mg(7)YMg11 cuboctahedra; corners with ten Mg(5,5)CaYMg10 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Mg(6)CaMg11 cuboctahedra; edges with two equivalent Mg(5)CaYMg10 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; edges with two equivalent Mg(7)YMg11 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra;  a faceface with one Ca(1)Y2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra;  a faceface with one Y(1)Ca2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; and faces with four equivalent Mg(4)Mg12 cuboctahedra. There is one shorter (3.27 Å) and one longer (3.33 Å) Mg(5)-Mg(5) bond length. There is one shorter (3.24 Å) and one longer (3.36 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.28 Å) and one longer (3.33 Å) Mg(5)-Mg(7) bond length. The Mg(5)-Y(1) bond length is 3.31 Å. In the seventh Mg site, Mg(5) is bonded to one Ca(1), one Mg(1), one Mg(2), one Mg(3), one Mg(4), two equivalent Mg(5), two equivalent Mg(6), two equivalent Mg(7), and one Y(1) atom to form distorted MgCaYMg10 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra; corners with four equivalent Mg(7)YMg11 cuboctahedra; corners with ten Mg(5,5)CaYMg10 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(3)Ca2Y2Mg8 cuboctahedra; edges with two equivalent Mg(6)CaMg11 cuboctahedra; edges with two equivalent Mg(5)CaYMg10 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; edges with two equivalent Mg(7)YMg11 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra;  a faceface with one Ca(1)Y2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra;  a faceface with one Y(1)Ca2Mg10 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; and faces with four equivalent Mg(4)Mg12 cuboctahedra. The Mg(5)-Mg(4) bond length is 3.17 Å. There is one shorter (3.24 Å) and one longer (3.36 Å) Mg(5)-Mg(6) bond length. There is one shorter (3.28 Å) and one longer (3.33 Å) Mg(5)-Mg(7) bond length. The Mg(5)-Y(1) bond length is 3.31 Å. In the eighth Mg site, Mg(6) is bonded to one Ca(1); one Mg(1); two Mg(3,3); two equivalent Mg(4); two equivalent Mg(7); and four Mg(5,5) atoms to form distorted MgCaMg11 cuboctahedra that share corners with four equivalent Mg(7)YMg11 cuboctahedra; corners with six equivalent Mg(6)CaMg11 cuboctahedra; corners with eight Mg(5,5)CaYMg10 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with two equivalent Mg(1)Mg12 cuboctahedra; edges with two equivalent Mg(7)YMg11 cuboctahedra; edges with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with four Mg(5,5)CaYMg10 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra;  a faceface with one Ca(1)Y2Mg10 cuboctahedra;  a faceface with one Mg(1)Mg12 cuboctahedra; faces with two Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with three equivalent Mg(2)Mg12 cuboctahedra; faces with three equivalent Y(1)Ca2Mg10 cuboctahedra; and faces with four Mg(5,5)CaYMg10 cuboctahedra. Both Mg(6)-Mg(7) bond lengths are 3.30 Å. In the ninth Mg site, Mg(7) is bonded to one Mg(2); two Mg(3,3); two equivalent Mg(4); two equivalent Mg(6); four Mg(5,5); and one Y(1) atom to form MgYMg11 cuboctahedra that share corners with four equivalent Mg(6)CaMg11 cuboctahedra; corners with six equivalent Mg(7)YMg11 cuboctahedra; corners with eight Mg(5,5)CaYMg10 cuboctahedra; edges with two equivalent Mg(6)CaMg11 cuboctahedra; edges with two equivalent Mg(2)Mg12 cuboctahedra; edges with two equivalent Y(1)Ca2Mg10 cuboctahedra; edges with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with four Mg(5,5)CaYMg10 cuboctahedra; edges with four equivalent Mg(4)Mg12 cuboctahedra;  a faceface with one Mg(2)Mg12 cuboctahedra;  a faceface with one Y(1)Ca2Mg10 cuboctahedra; faces with two Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with two equivalent Mg(6)CaMg11 cuboctahedra; faces with two equivalent Mg(4)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with three equivalent Ca(1)Y2Mg10 cuboctahedra; faces with three equivalent Mg(1)Mg12 cuboctahedra; and faces with four Mg(5,5)CaYMg10 cuboctahedra. The Mg(7)-Y(1) bond length is 3.30 Å. Y(1) is bonded to two equivalent Ca(1); two equivalent Mg(7); four Mg(3,3); and four Mg(5,5) atoms to form YCa2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Y(1)Ca2Mg10 cuboctahedra; corners with eight equivalent Mg(4)Mg12 cuboctahedra; edges with two equivalent Ca(1)Y2Mg10 cuboctahedra; edges with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; edges with four equivalent Mg(7)YMg11 cuboctahedra; edges with eight Mg(5,5)CaYMg10 cuboctahedra; faces with two equivalent Ca(1)Y2Mg10 cuboctahedra; faces with two equivalent Mg(2)Mg12 cuboctahedra; faces with two equivalent Mg(7)YMg11 cuboctahedra; faces with four Mg(3,3)Ca2Y2Mg8 cuboctahedra; faces with four Mg(5,5)CaYMg10 cuboctahedra; and faces with six equivalent Mg(6)CaMg11 cuboctahedra.