Ag2Cr2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form CrO4 tetrahedra that share corners with three equivalent Ag(1)O6 pentagonal pyramids,  a cornercorner with one Cr(2)O4 tetrahedra, and corners with two equivalent Ag(2)O5 trigonal bipyramids. In the second Cr site, Cr(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form CrO4 tetrahedra that share corners with three equivalent Ag(1)O6 pentagonal pyramids,  a cornercorner with one Cr(1)O4 tetrahedra, and corners with three equivalent Ag(2)O5 trigonal bipyramids. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one O(1), one O(2), one O(3), one O(7), and two equivalent O(6) atoms to form AgO6 pentagonal pyramids that share corners with three equivalent Cr(1)O4 tetrahedra, corners with three equivalent Cr(2)O4 tetrahedra,  a cornercorner with one Ag(2)O5 trigonal bipyramid,  an edgeedge with one Ag(1)O6 pentagonal pyramid, and  an edgeedge with one Ag(2)O5 trigonal bipyramid. In the second Ag site, Ag(2) is bonded to one O(2), one O(3), one O(7), and two equivalent O(4) atoms to form distorted AgO5 trigonal bipyramids that share  a cornercorner with one Ag(1)O6 pentagonal pyramid, corners with two equivalent Cr(1)O4 tetrahedra, corners with three equivalent Cr(2)O4 tetrahedra,  an edgeedge with one Ag(1)O6 pentagonal pyramid, and  an edgeedge with one Ag(2)O5 trigonal bipyramid. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cr(1) and one Ag(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cr(1), one Ag(1), and one Ag(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cr(1), one Ag(1), and one Ag(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Cr(2) and two equivalent Ag(2) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Cr(2) and two equivalent Ag(1) atoms. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cr(2), one Ag(1), and one Ag(2) atom.
Ag2Cr2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form CrO4 tetrahedra that share corners with three equivalent Ag(1)O6 pentagonal pyramids,  a cornercorner with one Cr(2)O4 tetrahedra, and corners with two equivalent Ag(2)O5 trigonal bipyramids. The Cr(1)-O(1) bond length is 1.63 Å. The Cr(1)-O(2) bond length is 1.66 Å. The Cr(1)-O(3) bond length is 1.65 Å. The Cr(1)-O(5) bond length is 1.79 Å. In the second Cr site, Cr(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form CrO4 tetrahedra that share corners with three equivalent Ag(1)O6 pentagonal pyramids,  a cornercorner with one Cr(1)O4 tetrahedra, and corners with three equivalent Ag(2)O5 trigonal bipyramids. The Cr(2)-O(4) bond length is 1.65 Å. The Cr(2)-O(5) bond length is 1.77 Å. The Cr(2)-O(6) bond length is 1.64 Å. The Cr(2)-O(7) bond length is 1.66 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one O(1), one O(2), one O(3), one O(7), and two equivalent O(6) atoms to form AgO6 pentagonal pyramids that share corners with three equivalent Cr(1)O4 tetrahedra, corners with three equivalent Cr(2)O4 tetrahedra,  a cornercorner with one Ag(2)O5 trigonal bipyramid,  an edgeedge with one Ag(1)O6 pentagonal pyramid, and  an edgeedge with one Ag(2)O5 trigonal bipyramid. The Ag(1)-O(1) bond length is 2.49 Å. The Ag(1)-O(2) bond length is 2.41 Å. The Ag(1)-O(3) bond length is 2.51 Å. The Ag(1)-O(7) bond length is 2.49 Å. There is one shorter (2.42 Å) and one longer (2.52 Å) Ag(1)-O(6) bond length. In the second Ag site, Ag(2) is bonded to one O(2), one O(3), one O(7), and two equivalent O(4) atoms to form distorted AgO5 trigonal bipyramids that share  a cornercorner with one Ag(1)O6 pentagonal pyramid, corners with two equivalent Cr(1)O4 tetrahedra, corners with three equivalent Cr(2)O4 tetrahedra,  an edgeedge with one Ag(1)O6 pentagonal pyramid, and  an edgeedge with one Ag(2)O5 trigonal bipyramid. The Ag(2)-O(2) bond length is 2.53 Å. The Ag(2)-O(3) bond length is 2.38 Å. The Ag(2)-O(7) bond length is 2.30 Å. There is one shorter (2.24 Å) and one longer (2.61 Å) Ag(2)-O(4) bond length. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cr(1) and one Ag(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cr(1), one Ag(1), and one Ag(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cr(1), one Ag(1), and one Ag(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Cr(2) and two equivalent Ag(2) atoms. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Cr(1) and one Cr(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Cr(2) and two equivalent Ag(1) atoms. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cr(2), one Ag(1), and one Ag(2) atom.