Hf3AgHg3F20 crystallizes in the hexagonal P6_3/m space group. Hf(1) is bonded to one F(2), one F(3), one F(6), two equivalent F(1), and two equivalent F(5) atoms to form HfF7 pentagonal bipyramids that share corners with two equivalent Hf(1)F7 pentagonal bipyramids, corners with four equivalent Hg(1)F7 pentagonal bipyramids,  a cornercorner with one Ag(1)F5 trigonal bipyramid, and  an edgeedge with one Hg(1)F7 pentagonal bipyramid. Ag(1) is bonded to two equivalent F(7) and three equivalent F(3) atoms to form AgF5 trigonal bipyramids that share corners with three equivalent Hf(1)F7 pentagonal bipyramids, corners with three equivalent Hg(1)F7 pentagonal bipyramids, and corners with two equivalent Ag(1)F5 trigonal bipyramids. Hg(1) is bonded to one F(2), one F(3), one F(4), two equivalent F(1), and two equivalent F(6) atoms to form distorted HgF7 pentagonal bipyramids that share corners with four equivalent Hf(1)F7 pentagonal bipyramids,  a cornercorner with one Ag(1)F5 trigonal bipyramid,  an edgeedge with one Hf(1)F7 pentagonal bipyramid, and edges with two equivalent Hg(1)F7 pentagonal bipyramids. There are seven inequivalent F sites. In the first F site, F(3) is bonded in a trigonal planar geometry to one Hf(1), one Ag(1), and one Hg(1) atom. In the second F site, F(4) is bonded in a trigonal planar geometry to three equivalent Hg(1) atoms. In the third F site, F(5) is bonded in a linear geometry to two equivalent Hf(1) atoms. In the fourth F site, F(1) is bonded in a linear geometry to one Hf(1) and one Hg(1) atom. In the fifth F site, F(6) is bonded in a 3-coordinate geometry to one Hf(1) and two equivalent Hg(1) atoms. In the sixth F site, F(7) is bonded in a linear geometry to two equivalent Ag(1) atoms. In the seventh F site, F(2) is bonded in a distorted bent 150 degrees geometry to one Hf(1) and one Hg(1) atom.
Hf3AgHg3F20 crystallizes in the hexagonal P6_3/m space group. Hf(1) is bonded to one F(2), one F(3), one F(6), two equivalent F(1), and two equivalent F(5) atoms to form HfF7 pentagonal bipyramids that share corners with two equivalent Hf(1)F7 pentagonal bipyramids, corners with four equivalent Hg(1)F7 pentagonal bipyramids,  a cornercorner with one Ag(1)F5 trigonal bipyramid, and  an edgeedge with one Hg(1)F7 pentagonal bipyramid. The Hf(1)-F(2) bond length is 2.05 Å. The Hf(1)-F(3) bond length is 2.11 Å. The Hf(1)-F(6) bond length is 2.06 Å. Both Hf(1)-F(1) bond lengths are 1.99 Å. There is one shorter (2.12 Å) and one longer (2.13 Å) Hf(1)-F(5) bond length. Ag(1) is bonded to two equivalent F(7) and three equivalent F(3) atoms to form AgF5 trigonal bipyramids that share corners with three equivalent Hf(1)F7 pentagonal bipyramids, corners with three equivalent Hg(1)F7 pentagonal bipyramids, and corners with two equivalent Ag(1)F5 trigonal bipyramids. Both Ag(1)-F(7) bond lengths are 2.16 Å. All Ag(1)-F(3) bond lengths are 2.37 Å. Hg(1) is bonded to one F(2), one F(3), one F(4), two equivalent F(1), and two equivalent F(6) atoms to form distorted HgF7 pentagonal bipyramids that share corners with four equivalent Hf(1)F7 pentagonal bipyramids,  a cornercorner with one Ag(1)F5 trigonal bipyramid,  an edgeedge with one Hf(1)F7 pentagonal bipyramid, and edges with two equivalent Hg(1)F7 pentagonal bipyramids. The Hg(1)-F(2) bond length is 2.31 Å. The Hg(1)-F(3) bond length is 2.40 Å. The Hg(1)-F(4) bond length is 2.28 Å. Both Hg(1)-F(1) bond lengths are 2.34 Å. There is one shorter (2.46 Å) and one longer (2.57 Å) Hg(1)-F(6) bond length. There are seven inequivalent F sites. In the first F site, F(3) is bonded in a trigonal planar geometry to one Hf(1), one Ag(1), and one Hg(1) atom. In the second F site, F(4) is bonded in a trigonal planar geometry to three equivalent Hg(1) atoms. In the third F site, F(5) is bonded in a linear geometry to two equivalent Hf(1) atoms. In the fourth F site, F(1) is bonded in a linear geometry to one Hf(1) and one Hg(1) atom. In the fifth F site, F(6) is bonded in a 3-coordinate geometry to one Hf(1) and two equivalent Hg(1) atoms. In the sixth F site, F(7) is bonded in a linear geometry to two equivalent Ag(1) atoms. In the seventh F site, F(2) is bonded in a distorted bent 150 degrees geometry to one Hf(1) and one Hg(1) atom.