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A group of minerals containing various amounts of the elements Silicon and Oxygen. The Silicates are the largest group of minerals. The construction component of all Silicates is the tetrahedron, which is one Silicon atom equidimensionally placed around four Oxygen atoms.
The basic building block of all silicate minerals is the [SiO4] 4â tetrahedron. Silicate minerals containing chains are termed inosilicates. In single chains (SiO 3 2â) n, the silicon to oxygen ratio is 1:3, while in double chains (Si 4 O 11 6â) n, the silicon to oxygen ratio is 4:11. The formula of silicate sheet is (Si 2 O 5 2â) n. Silicate minerals containing sheets are termed phyllosilicates. Key Terms