Ca2AgGa7 crystallizes in the tetragonal P-4m2 space group. Ca(1) is bonded in a 16-coordinate geometry to two equivalent Ag(1), two equivalent Ga(3), two equivalent Ga(4), two equivalent Ga(5), four equivalent Ga(1), and four equivalent Ga(2) atoms. Ag(1) is bonded to four equivalent Ca(1), four equivalent Ga(1), and four equivalent Ga(4) atoms to form distorted AgCa4Ga8 cuboctahedra that share corners with four equivalent Ag(1)Ca4Ga8 cuboctahedra, corners with four equivalent Ga(5)Ca4Ga8 cuboctahedra, corners with eight equivalent Ga(3)Ca4Ga8 cuboctahedra, edges with two equivalent Ga(5)Ca4Ga8 cuboctahedra, faces with four equivalent Ag(1)Ca4Ga8 cuboctahedra, and faces with four equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra. There are five inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), two equivalent Ag(1), one Ga(2), and two equivalent Ga(4) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to four equivalent Ca(1), one Ga(1), two equivalent Ga(3), and two equivalent Ga(5) atoms. In the third Ga site, Ga(3) is bonded to four equivalent Ca(1), four equivalent Ga(2), and four equivalent Ga(5) atoms to form distorted GaCa4Ga8 cuboctahedra that share corners with four equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra, corners with four equivalent Ga(3)Ca4Ga8 cuboctahedra, corners with eight equivalent Ag(1)Ca4Ga8 cuboctahedra, edges with two equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra, faces with four equivalent Ga(3)Ca4Ga8 cuboctahedra, and faces with four equivalent Ga(5)Ca4Ga8 cuboctahedra. In the fourth Ga site, Ga(4) is bonded to four equivalent Ca(1), four equivalent Ag(1), and four equivalent Ga(1) atoms to form GaCa4Ga4Ag4 cuboctahedra that share corners with four equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra, corners with four equivalent Ga(3)Ca4Ga8 cuboctahedra, corners with eight equivalent Ga(5)Ca4Ga8 cuboctahedra, edges with two equivalent Ga(3)Ca4Ga8 cuboctahedra, faces with four equivalent Ag(1)Ca4Ga8 cuboctahedra, and faces with four equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra. In the fifth Ga site, Ga(5) is bonded to four equivalent Ca(1), four equivalent Ga(2), and four equivalent Ga(3) atoms to form distorted GaCa4Ga8 cuboctahedra that share corners with four equivalent Ag(1)Ca4Ga8 cuboctahedra, corners with four equivalent Ga(5)Ca4Ga8 cuboctahedra, corners with eight equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra, edges with two equivalent Ag(1)Ca4Ga8 cuboctahedra, faces with four equivalent Ga(3)Ca4Ga8 cuboctahedra, and faces with four equivalent Ga(5)Ca4Ga8 cuboctahedra.
Ca2AgGa7 crystallizes in the tetragonal P-4m2 space group. Ca(1) is bonded in a 16-coordinate geometry to two equivalent Ag(1), two equivalent Ga(3), two equivalent Ga(4), two equivalent Ga(5), four equivalent Ga(1), and four equivalent Ga(2) atoms. Both Ca(1)-Ag(1) bond lengths are 3.47 Å. Both Ca(1)-Ga(3) bond lengths are 3.47 Å. Both Ca(1)-Ga(4) bond lengths are 3.47 Å. Both Ca(1)-Ga(5) bond lengths are 3.47 Å. All Ca(1)-Ga(1) bond lengths are 3.24 Å. All Ca(1)-Ga(2) bond lengths are 3.25 Å. Ag(1) is bonded to four equivalent Ca(1), four equivalent Ga(1), and four equivalent Ga(4) atoms to form distorted AgCa4Ga8 cuboctahedra that share corners with four equivalent Ag(1)Ca4Ga8 cuboctahedra, corners with four equivalent Ga(5)Ca4Ga8 cuboctahedra, corners with eight equivalent Ga(3)Ca4Ga8 cuboctahedra, edges with two equivalent Ga(5)Ca4Ga8 cuboctahedra, faces with four equivalent Ag(1)Ca4Ga8 cuboctahedra, and faces with four equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra. All Ag(1)-Ga(1) bond lengths are 2.61 Å. All Ag(1)-Ga(4) bond lengths are 3.00 Å. There are five inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), two equivalent Ag(1), one Ga(2), and two equivalent Ga(4) atoms. The Ga(1)-Ga(2) bond length is 2.47 Å. Both Ga(1)-Ga(4) bond lengths are 2.61 Å. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to four equivalent Ca(1), one Ga(1), two equivalent Ga(3), and two equivalent Ga(5) atoms. Both Ga(2)-Ga(3) bond lengths are 2.60 Å. Both Ga(2)-Ga(5) bond lengths are 2.60 Å. In the third Ga site, Ga(3) is bonded to four equivalent Ca(1), four equivalent Ga(2), and four equivalent Ga(5) atoms to form distorted GaCa4Ga8 cuboctahedra that share corners with four equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra, corners with four equivalent Ga(3)Ca4Ga8 cuboctahedra, corners with eight equivalent Ag(1)Ca4Ga8 cuboctahedra, edges with two equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra, faces with four equivalent Ga(3)Ca4Ga8 cuboctahedra, and faces with four equivalent Ga(5)Ca4Ga8 cuboctahedra. All Ga(3)-Ga(5) bond lengths are 3.00 Å. In the fourth Ga site, Ga(4) is bonded to four equivalent Ca(1), four equivalent Ag(1), and four equivalent Ga(1) atoms to form GaCa4Ga4Ag4 cuboctahedra that share corners with four equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra, corners with four equivalent Ga(3)Ca4Ga8 cuboctahedra, corners with eight equivalent Ga(5)Ca4Ga8 cuboctahedra, edges with two equivalent Ga(3)Ca4Ga8 cuboctahedra, faces with four equivalent Ag(1)Ca4Ga8 cuboctahedra, and faces with four equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra. In the fifth Ga site, Ga(5) is bonded to four equivalent Ca(1), four equivalent Ga(2), and four equivalent Ga(3) atoms to form distorted GaCa4Ga8 cuboctahedra that share corners with four equivalent Ag(1)Ca4Ga8 cuboctahedra, corners with four equivalent Ga(5)Ca4Ga8 cuboctahedra, corners with eight equivalent Ga(4)Ca4Ga4Ag4 cuboctahedra, edges with two equivalent Ag(1)Ca4Ga8 cuboctahedra, faces with four equivalent Ga(3)Ca4Ga8 cuboctahedra, and faces with four equivalent Ga(5)Ca4Ga8 cuboctahedra.