Dy6Al2SiS14 crystallizes in the trigonal P3 space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one S(1), one S(3), one S(6), two equivalent S(4), and two equivalent S(5) atoms. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to one S(2), one S(5), two equivalent S(3), two equivalent S(4), and two equivalent S(6) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in an octahedral geometry to three equivalent S(3) and three equivalent S(4) atoms. In the second Al site, Al(2) is bonded in a tetrahedral geometry to one S(2) and three equivalent S(6) atoms. Si(1) is bonded in a tetrahedral geometry to one S(1) and three equivalent S(5) atoms. There are six inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Dy(1) and one Si(1) atom to form distorted corner-sharing SDy3Si tetrahedra. In the second S site, S(2) is bonded to three equivalent Dy(2) and one Al(2) atom to form distorted corner-sharing SDy3Al tetrahedra. In the third S site, S(3) is bonded to one Dy(1), two equivalent Dy(2), and one Al(1) atom to form distorted SDy3Al trigonal pyramids that share  a cornercorner with one S(1)Dy3Si tetrahedra, corners with two equivalent S(2)Dy3Al tetrahedra, and edges with two equivalent S(3)Dy3Al trigonal pyramids. In the fourth S site, S(4) is bonded in a 4-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), and one Al(1) atom. In the fifth S site, S(5) is bonded in a distorted rectangular see-saw-like geometry to one Dy(2), two equivalent Dy(1), and one Si(1) atom. In the sixth S site, S(6) is bonded in a distorted rectangular see-saw-like geometry to one Dy(1), two equivalent Dy(2), and one Al(2) atom.
Dy6Al2SiS14 crystallizes in the trigonal P3 space group. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one S(1), one S(3), one S(6), two equivalent S(4), and two equivalent S(5) atoms. The Dy(1)-S(1) bond length is 2.85 Å. The Dy(1)-S(3) bond length is 2.69 Å. The Dy(1)-S(6) bond length is 2.96 Å. There is one shorter (2.73 Å) and one longer (2.78 Å) Dy(1)-S(4) bond length. There is one shorter (2.81 Å) and one longer (2.87 Å) Dy(1)-S(5) bond length. In the second Dy site, Dy(2) is bonded in a 8-coordinate geometry to one S(2), one S(5), two equivalent S(3), two equivalent S(4), and two equivalent S(6) atoms. The Dy(2)-S(2) bond length is 2.82 Å. The Dy(2)-S(5) bond length is 3.08 Å. There is one shorter (2.73 Å) and one longer (2.81 Å) Dy(2)-S(3) bond length. There is one shorter (2.92 Å) and one longer (3.40 Å) Dy(2)-S(4) bond length. There is one shorter (2.76 Å) and one longer (2.81 Å) Dy(2)-S(6) bond length. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in an octahedral geometry to three equivalent S(3) and three equivalent S(4) atoms. All Al(1)-S(3) bond lengths are 2.42 Å. All Al(1)-S(4) bond lengths are 2.48 Å. In the second Al site, Al(2) is bonded in a tetrahedral geometry to one S(2) and three equivalent S(6) atoms. The Al(2)-S(2) bond length is 2.22 Å. All Al(2)-S(6) bond lengths are 2.25 Å. Si(1) is bonded in a tetrahedral geometry to one S(1) and three equivalent S(5) atoms. The Si(1)-S(1) bond length is 2.13 Å. All Si(1)-S(5) bond lengths are 2.14 Å. There are six inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Dy(1) and one Si(1) atom to form distorted corner-sharing SDy3Si tetrahedra. In the second S site, S(2) is bonded to three equivalent Dy(2) and one Al(2) atom to form distorted corner-sharing SDy3Al tetrahedra. In the third S site, S(3) is bonded to one Dy(1), two equivalent Dy(2), and one Al(1) atom to form distorted SDy3Al trigonal pyramids that share  a cornercorner with one S(1)Dy3Si tetrahedra, corners with two equivalent S(2)Dy3Al tetrahedra, and edges with two equivalent S(3)Dy3Al trigonal pyramids. In the fourth S site, S(4) is bonded in a 4-coordinate geometry to two equivalent Dy(1), two equivalent Dy(2), and one Al(1) atom. In the fifth S site, S(5) is bonded in a distorted rectangular see-saw-like geometry to one Dy(2), two equivalent Dy(1), and one Si(1) atom. In the sixth S site, S(6) is bonded in a distorted rectangular see-saw-like geometry to one Dy(1), two equivalent Dy(2), and one Al(2) atom.