NaMg6La crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent La(1) atoms to form NaLa2Mg10 cuboctahedra that share corners with four equivalent La(1)Na2Mg10 cuboctahedra, corners with six equivalent Na(1)La2Mg10 cuboctahedra, edges with two equivalent La(1)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)La2Mg10 cuboctahedra, and faces with two equivalent La(1)Na2Mg10 cuboctahedra. There are four 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 La(1) atoms. In the second Mg site, Mg(2) 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 La(1) atoms. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent La(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted water-like geometry to two equivalent Na(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms. La(1) is bonded to two equivalent Na(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms to form LaNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)La2Mg10 cuboctahedra, corners with six equivalent La(1)Na2Mg10 cuboctahedra, edges with two equivalent Na(1)La2Mg10 cuboctahedra, faces with two equivalent Na(1)La2Mg10 cuboctahedra, and faces with two equivalent La(1)Na2Mg10 cuboctahedra.
NaMg6La crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent La(1) atoms to form NaLa2Mg10 cuboctahedra that share corners with four equivalent La(1)Na2Mg10 cuboctahedra, corners with six equivalent Na(1)La2Mg10 cuboctahedra, edges with two equivalent La(1)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)La2Mg10 cuboctahedra, and faces with two equivalent La(1)Na2Mg10 cuboctahedra. Both Na(1)-Mg(4) bond lengths are 3.32 Å. There are two shorter (3.36 Å) and two longer (3.46 Å) Na(1)-Mg(1) bond lengths. All Na(1)-Mg(2) bond lengths are 3.30 Å. Both Na(1)-La(1) bond lengths are 3.45 Å. There are four 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 La(1) atoms. There is one shorter (3.36 Å) and one longer (3.53 Å) Mg(1)-Mg(1) bond length. Both Mg(1)-Mg(2) bond lengths are 3.24 Å. Both Mg(1)-Mg(3) bond lengths are 3.27 Å. Both Mg(1)-Mg(4) bond lengths are 3.32 Å. There is one shorter (3.39 Å) and one longer (3.43 Å) Mg(1)-La(1) bond length. In the second Mg site, Mg(2) 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 La(1) atoms. There is one shorter (3.39 Å) and one longer (3.51 Å) Mg(2)-Mg(2) bond length. There is one shorter (3.29 Å) and one longer (3.53 Å) Mg(2)-Mg(3) bond length. There is one shorter (3.35 Å) and one longer (3.47 Å) Mg(2)-Mg(4) bond length. Both Mg(2)-La(1) bond lengths are 3.33 Å. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent La(1) atoms. Both Mg(3)-Mg(4) bond lengths are 3.45 Å. Both Mg(3)-La(1) bond lengths are 3.34 Å. In the fourth Mg site, Mg(4) is bonded in a distorted water-like geometry to two equivalent Na(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms. La(1) is bonded to two equivalent Na(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms to form LaNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)La2Mg10 cuboctahedra, corners with six equivalent La(1)Na2Mg10 cuboctahedra, edges with two equivalent Na(1)La2Mg10 cuboctahedra, faces with two equivalent Na(1)La2Mg10 cuboctahedra, and faces with two equivalent La(1)Na2Mg10 cuboctahedra.