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An atomic arrangement in which two single chains of silica tetrahedra bond together by sharing the third oxygen in alternate tetrahedra. Feldspar group A group of silicate minerals in which silica tetrahedra are arranged in a framework structure and containing potassium, calcium or sodium cations.
Initially, my silver atom is neutral and oxygen has a coordination of 2 with silicon having a coordination of 4. After the deposition of silver atoms, I find that the coordination of silver atoms ranges up to 12 and oxygen has coordination of 3 where a bond is formed with silver. Since $\ce{Ag-Si}$ bonds are not present, silicon's coordination number does not change. I want to understand why oxygen is able to have a coordination number of 3 as with 2 bonds with silicon, the valency is already satisfied. I know silver forms a fcc-lattice where the coordination number is 12 but I want to get a more in depth detail of this change of coordination number.