Be8Ru crystallizes in the hexagonal P-6m2 space group. There are six inequivalent Be sites. In the first Be site, Be(1) is bonded to three equivalent Be(2), three equivalent Be(4), three equivalent Be(6), and three equivalent Ru(1) atoms to form distorted BeBe9Ru3 cuboctahedra that share corners with six equivalent Be(4)Be10Ru2 cuboctahedra, edges with six equivalent Be(1)Be9Ru3 cuboctahedra,  a faceface with one Be(1)Be9Ru3 cuboctahedra, and faces with nine equivalent Be(4)Be10Ru2 cuboctahedra. In the second Be site, Be(2) is bonded in a distorted q6 geometry to one Be(1), one Be(5), one Be(6), two equivalent Be(3), four equivalent Be(2), and two equivalent Ru(1) atoms. In the third Be site, Be(3) is bonded in a 8-coordinate geometry to one Be(3), three equivalent Be(5), six equivalent Be(2), and one Ru(1) atom. In the fourth Be site, Be(4) is bonded to two equivalent Be(1), four equivalent Be(4), four equivalent Be(6), and two equivalent Ru(1) atoms to form distorted BeBe10Ru2 cuboctahedra that share corners with four equivalent Be(4)Be10Ru2 cuboctahedra, corners with four equivalent Be(1)Be9Ru3 cuboctahedra, edges with two equivalent Be(4)Be10Ru2 cuboctahedra, faces with six equivalent Be(1)Be9Ru3 cuboctahedra, and faces with eight equivalent Be(4)Be10Ru2 cuboctahedra. In the fifth Be site, Be(5) is bonded in a 12-coordinate geometry to six equivalent Be(2) and six equivalent Be(3) atoms. In the sixth Be site, Be(6) is bonded in a 3-coordinate geometry to three equivalent Be(1), three equivalent Be(2), six equivalent Be(4), and three equivalent Ru(1) atoms. Ru(1) is bonded in a 16-coordinate geometry to one Be(3), three equivalent Be(1), three equivalent Be(4), three equivalent Be(6), and six equivalent Be(2) atoms.
Be8Ru crystallizes in the hexagonal P-6m2 space group. There are six inequivalent Be sites. In the first Be site, Be(1) is bonded to three equivalent Be(2), three equivalent Be(4), three equivalent Be(6), and three equivalent Ru(1) atoms to form distorted BeBe9Ru3 cuboctahedra that share corners with six equivalent Be(4)Be10Ru2 cuboctahedra, edges with six equivalent Be(1)Be9Ru3 cuboctahedra,  a faceface with one Be(1)Be9Ru3 cuboctahedra, and faces with nine equivalent Be(4)Be10Ru2 cuboctahedra. All Be(1)-Be(2) bond lengths are 2.14 Å. All Be(1)-Be(4) bond lengths are 2.11 Å. All Be(1)-Be(6) bond lengths are 2.43 Å. All Be(1)-Ru(1) bond lengths are 2.44 Å. In the second Be site, Be(2) is bonded in a distorted q6 geometry to one Be(1), one Be(5), one Be(6), two equivalent Be(3), four equivalent Be(2), and two equivalent Ru(1) atoms. The Be(2)-Be(5) bond length is 2.34 Å. The Be(2)-Be(6) bond length is 2.41 Å. Both Be(2)-Be(3) bond lengths are 2.29 Å. All Be(2)-Be(2) bond lengths are 2.08 Å. Both Be(2)-Ru(1) bond lengths are 2.49 Å. In the third Be site, Be(3) is bonded in a 8-coordinate geometry to one Be(3), three equivalent Be(5), six equivalent Be(2), and one Ru(1) atom. The Be(3)-Be(3) bond length is 2.13 Å. All Be(3)-Be(5) bond lengths are 2.63 Å. The Be(3)-Ru(1) bond length is 2.31 Å. In the fourth Be site, Be(4) is bonded to two equivalent Be(1), four equivalent Be(4), four equivalent Be(6), and two equivalent Ru(1) atoms to form distorted BeBe10Ru2 cuboctahedra that share corners with four equivalent Be(4)Be10Ru2 cuboctahedra, corners with four equivalent Be(1)Be9Ru3 cuboctahedra, edges with two equivalent Be(4)Be10Ru2 cuboctahedra, faces with six equivalent Be(1)Be9Ru3 cuboctahedra, and faces with eight equivalent Be(4)Be10Ru2 cuboctahedra. There are two shorter (2.03 Å) and two longer (2.14 Å) Be(4)-Be(4) bond lengths. All Be(4)-Be(6) bond lengths are 2.50 Å. Both Be(4)-Ru(1) bond lengths are 2.42 Å. In the fifth Be site, Be(5) is bonded in a 12-coordinate geometry to six equivalent Be(2) and six equivalent Be(3) atoms. In the sixth Be site, Be(6) is bonded in a 3-coordinate geometry to three equivalent Be(1), three equivalent Be(2), six equivalent Be(4), and three equivalent Ru(1) atoms. All Be(6)-Ru(1) bond lengths are 2.51 Å. Ru(1) is bonded in a 16-coordinate geometry to one Be(3), three equivalent Be(1), three equivalent Be(4), three equivalent Be(6), and six equivalent Be(2) atoms.