Ag8Hg(AsO5)2 crystallizes in the trigonal P31c space group. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(6) atom. In the second Ag site, Ag(2) is bonded in a 3-coordinate geometry to three equivalent O(5) atoms. In the third Ag site, Ag(3) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. In the fourth Ag site, Ag(4) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(4) atom. Hg(1) is bonded in a linear geometry to one O(2) and one O(6) atom. There are two inequivalent As sites. In the first As site, As(1) is bonded in a tetrahedral geometry to one O(4) and three equivalent O(5) atoms. In the second As site, As(2) is bonded in a tetrahedral geometry to one O(3) and three equivalent O(1) atoms. There are six inequivalent O sites. In the first O site, O(4) is bonded to three equivalent Ag(4) and one As(1) atom to form distorted corner-sharing OAg3As tetrahedra. In the second O site, O(5) is bonded in a trigonal planar geometry to one Ag(1), one Ag(2), and one As(1) atom. In the third O site, O(6) is bonded to three equivalent Ag(1) and one Hg(1) atom to form OAg3Hg tetrahedra that share  a cornercorner with one O(2)Ag3Hg tetrahedra and corners with three equivalent O(3)Ag3As tetrahedra. In the fourth O site, O(1) is bonded in a trigonal planar geometry to one Ag(3), one Ag(4), and one As(2) atom. In the fifth O site, O(2) is bonded to three equivalent Ag(4) and one Hg(1) atom to form OAg3Hg tetrahedra that share  a cornercorner with one O(6)Ag3Hg tetrahedra and corners with three equivalent O(4)Ag3As tetrahedra. In the sixth O site, O(3) is bonded to three equivalent Ag(1) and one As(2) atom to form distorted corner-sharing OAg3As tetrahedra.
Ag8Hg(AsO5)2 crystallizes in the trigonal P31c space group. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(6) atom. The Ag(1)-O(3) bond length is 2.47 Å. The Ag(1)-O(5) bond length is 2.31 Å. The Ag(1)-O(6) bond length is 2.29 Å. In the second Ag site, Ag(2) is bonded in a 3-coordinate geometry to three equivalent O(5) atoms. All Ag(2)-O(5) bond lengths are 2.29 Å. In the third Ag site, Ag(3) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. All Ag(3)-O(1) bond lengths are 2.31 Å. In the fourth Ag site, Ag(4) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(4) atom. The Ag(4)-O(1) bond length is 2.37 Å. The Ag(4)-O(2) bond length is 2.26 Å. The Ag(4)-O(4) bond length is 2.37 Å. Hg(1) is bonded in a linear geometry to one O(2) and one O(6) atom. The Hg(1)-O(2) bond length is 2.10 Å. The Hg(1)-O(6) bond length is 2.07 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a tetrahedral geometry to one O(4) and three equivalent O(5) atoms. The As(1)-O(4) bond length is 1.76 Å. All As(1)-O(5) bond lengths are 1.72 Å. In the second As site, As(2) is bonded in a tetrahedral geometry to one O(3) and three equivalent O(1) atoms. The As(2)-O(3) bond length is 1.73 Å. All As(2)-O(1) bond lengths are 1.74 Å. There are six inequivalent O sites. In the first O site, O(4) is bonded to three equivalent Ag(4) and one As(1) atom to form distorted corner-sharing OAg3As tetrahedra. In the second O site, O(5) is bonded in a trigonal planar geometry to one Ag(1), one Ag(2), and one As(1) atom. In the third O site, O(6) is bonded to three equivalent Ag(1) and one Hg(1) atom to form OAg3Hg tetrahedra that share  a cornercorner with one O(2)Ag3Hg tetrahedra and corners with three equivalent O(3)Ag3As tetrahedra. In the fourth O site, O(1) is bonded in a trigonal planar geometry to one Ag(3), one Ag(4), and one As(2) atom. In the fifth O site, O(2) is bonded to three equivalent Ag(4) and one Hg(1) atom to form OAg3Hg tetrahedra that share  a cornercorner with one O(6)Ag3Hg tetrahedra and corners with three equivalent O(4)Ag3As tetrahedra. In the sixth O site, O(3) is bonded to three equivalent Ag(1) and one As(2) atom to form distorted corner-sharing OAg3As tetrahedra.