CaSi2(AgO)8 crystallizes in the monoclinic P2 space group. Ca(1) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. In the second Ag site, Ag(2) is bonded in a distorted L-shaped geometry to one O(1) and one O(4) atom. In the third Ag site, Ag(3) is bonded in a 2-coordinate geometry to one O(2) and one O(3) atom. In the fourth Ag site, Ag(4) is bonded in a distorted linear geometry to one O(3) and one O(4) atom. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to two equivalent O(2) and two equivalent O(4) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Ca(1), one Ag(2), and one Si(2) atom. In the second O site, O(2) is bonded to one Ca(1), one Ag(1), one Ag(3), and one Si(1) atom to form distorted corner-sharing OCaSiAg2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(3), one Ag(4), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(2), one Ag(4), and one Si(1) atom.
CaSi2(AgO)8 crystallizes in the monoclinic P2 space group. Ca(1) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Ca(1)-O(1) bond lengths are 2.41 Å. Both Ca(1)-O(2) bond lengths are 2.38 Å. There are four inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. The Ag(1)-O(2) bond length is 2.55 Å. The Ag(1)-O(3) bond length is 2.33 Å. The Ag(1)-O(4) bond length is 2.58 Å. In the second Ag site, Ag(2) is bonded in a distorted L-shaped geometry to one O(1) and one O(4) atom. The Ag(2)-O(1) bond length is 2.51 Å. The Ag(2)-O(4) bond length is 2.28 Å. In the third Ag site, Ag(3) is bonded in a 2-coordinate geometry to one O(2) and one O(3) atom. The Ag(3)-O(2) bond length is 2.33 Å. The Ag(3)-O(3) bond length is 2.61 Å. In the fourth Ag site, Ag(4) is bonded in a distorted linear geometry to one O(3) and one O(4) atom. The Ag(4)-O(3) bond length is 2.13 Å. The Ag(4)-O(4) bond length is 2.11 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to two equivalent O(2) and two equivalent O(4) atoms. Both Si(1)-O(2) bond lengths are 1.68 Å. Both Si(1)-O(4) bond lengths are 1.66 Å. In the second Si site, Si(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Si(2)-O(1) bond lengths are 1.67 Å. Both Si(2)-O(3) bond lengths are 1.67 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Ca(1), one Ag(2), and one Si(2) atom. In the second O site, O(2) is bonded to one Ca(1), one Ag(1), one Ag(3), and one Si(1) atom to form distorted corner-sharing OCaSiAg2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(3), one Ag(4), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ag(1), one Ag(2), one Ag(4), and one Si(1) atom.