NaSrMg14 crystallizes in the hexagonal P-6m2 space group. Na(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form NaMg12 cuboctahedra that share corners with six equivalent Na(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with six equivalent Mg(1)Na2Mg10 cuboctahedra, edges with twelve equivalent Mg(3)NaSrMg10 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, faces with six equivalent Mg(1)Na2Mg10 cuboctahedra, and faces with six equivalent Mg(3)NaSrMg10 cuboctahedra. Sr(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form SrMg12 cuboctahedra that share corners with six equivalent Sr(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(1)Na2Mg10 cuboctahedra, edges with six equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with twelve equivalent Mg(3)NaSrMg10 cuboctahedra, faces with two equivalent Na(1)Mg12 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, faces with six equivalent Mg(3)NaSrMg10 cuboctahedra, and faces with six equivalent Mg(2)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Sr(1)Mg12 cuboctahedra, corners with six equivalent Mg(1)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with two equivalent Na(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(1)Na2Mg10 cuboctahedra, edges with eight equivalent Mg(3)NaSrMg10 cuboctahedra, faces with two equivalent Na(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Mg10 cuboctahedra, and faces with ten equivalent Mg(3)NaSrMg10 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Na(1)Mg12 cuboctahedra, corners with six equivalent Mg(2)Sr2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with eight equivalent Mg(3)NaSrMg10 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with ten equivalent Mg(3)NaSrMg10 cuboctahedra. In the third Mg site, Mg(3) is bonded to one Na(1), one Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and four equivalent Mg(3) atoms to form distorted MgNaSrMg10 cuboctahedra that share corners with four equivalent Mg(4)Mg12 cuboctahedra, corners with fourteen equivalent Mg(3)NaSrMg10 cuboctahedra, edges with two equivalent Na(1)Mg12 cuboctahedra, edges with two equivalent Sr(1)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(3)NaSrMg10 cuboctahedra, edges with four equivalent Mg(2)Sr2Mg10 cuboctahedra,  a faceface with one Na(1)Mg12 cuboctahedra,  a faceface with one Sr(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with five equivalent Mg(1)Na2Mg10 cuboctahedra, faces with five equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with six equivalent Mg(3)NaSrMg10 cuboctahedra. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, corners with twelve equivalent Mg(3)NaSrMg10 cuboctahedra, edges with six equivalent Mg(1)Na2Mg10 cuboctahedra, edges with six equivalent Mg(3)NaSrMg10 cuboctahedra, edges with six equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Na(1)Mg12 cuboctahedra, faces with three equivalent Sr(1)Mg12 cuboctahedra, faces with three equivalent Mg(1)Na2Mg10 cuboctahedra, faces with three equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with six equivalent Mg(3)NaSrMg10 cuboctahedra.
NaSrMg14 crystallizes in the hexagonal P-6m2 space group. Na(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form NaMg12 cuboctahedra that share corners with six equivalent Na(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with six equivalent Mg(1)Na2Mg10 cuboctahedra, edges with twelve equivalent Mg(3)NaSrMg10 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, faces with six equivalent Mg(1)Na2Mg10 cuboctahedra, and faces with six equivalent Mg(3)NaSrMg10 cuboctahedra. All Na(1)-Mg(1) bond lengths are 3.33 Å. All Na(1)-Mg(3) bond lengths are 3.25 Å. Sr(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form SrMg12 cuboctahedra that share corners with six equivalent Sr(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(1)Na2Mg10 cuboctahedra, edges with six equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with twelve equivalent Mg(3)NaSrMg10 cuboctahedra, faces with two equivalent Na(1)Mg12 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, faces with six equivalent Mg(3)NaSrMg10 cuboctahedra, and faces with six equivalent Mg(2)Sr2Mg10 cuboctahedra. All Sr(1)-Mg(2) bond lengths are 3.33 Å. All Sr(1)-Mg(3) bond lengths are 3.34 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Sr(1)Mg12 cuboctahedra, corners with six equivalent Mg(1)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with two equivalent Na(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(1)Na2Mg10 cuboctahedra, edges with eight equivalent Mg(3)NaSrMg10 cuboctahedra, faces with two equivalent Na(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Mg10 cuboctahedra, and faces with ten equivalent Mg(3)NaSrMg10 cuboctahedra. Both Mg(1)-Mg(4) bond lengths are 3.29 Å. There are two shorter (3.31 Å) and two longer (3.36 Å) Mg(1)-Mg(1) bond lengths. All Mg(1)-Mg(3) bond lengths are 3.19 Å. In the second Mg site, Mg(2) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Na(1)Mg12 cuboctahedra, corners with six equivalent Mg(2)Sr2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with eight equivalent Mg(3)NaSrMg10 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with ten equivalent Mg(3)NaSrMg10 cuboctahedra. Both Mg(2)-Mg(4) bond lengths are 3.26 Å. There are two shorter (3.26 Å) and two longer (3.40 Å) Mg(2)-Mg(2) bond lengths. All Mg(2)-Mg(3) bond lengths are 3.28 Å. In the third Mg site, Mg(3) is bonded to one Na(1), one Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and four equivalent Mg(3) atoms to form distorted MgNaSrMg10 cuboctahedra that share corners with four equivalent Mg(4)Mg12 cuboctahedra, corners with fourteen equivalent Mg(3)NaSrMg10 cuboctahedra, edges with two equivalent Na(1)Mg12 cuboctahedra, edges with two equivalent Sr(1)Mg12 cuboctahedra, edges with two equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(3)NaSrMg10 cuboctahedra, edges with four equivalent Mg(2)Sr2Mg10 cuboctahedra,  a faceface with one Na(1)Mg12 cuboctahedra,  a faceface with one Sr(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with five equivalent Mg(1)Na2Mg10 cuboctahedra, faces with five equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with six equivalent Mg(3)NaSrMg10 cuboctahedra. Both Mg(3)-Mg(4) bond lengths are 3.34 Å. There are two shorter (3.23 Å) and two longer (3.44 Å) Mg(3)-Mg(3) bond lengths. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, corners with twelve equivalent Mg(3)NaSrMg10 cuboctahedra, edges with six equivalent Mg(1)Na2Mg10 cuboctahedra, edges with six equivalent Mg(3)NaSrMg10 cuboctahedra, edges with six equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Na(1)Mg12 cuboctahedra, faces with three equivalent Sr(1)Mg12 cuboctahedra, faces with three equivalent Mg(1)Na2Mg10 cuboctahedra, faces with three equivalent Mg(2)Sr2Mg10 cuboctahedra, and faces with six equivalent Mg(3)NaSrMg10 cuboctahedra.