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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.
The vast majority of minerals in the Earth's rocks, from the crust down to the iron core, are chemically classed as silicates. The silicate minerals are all based upon a chemical unit called the silica tetrahedron.The silica tetrahedron consists of a silicon atom surrounded by four oxygen atoms.solated silica tetrahedra occur in many silicates such as olivine, where the tetrahedra are surrounded by iron and magnesium cations. Pairs of tetrahedra (SiO 7) occur in several silicates, the best known of which is probably hemimorphite.