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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.
Silicates. The fundamental structural unit is the silicon and oxygen tetrahedron. The four oxygens sit on the corners of the tetrahedon and the silicon sits at the center. These tetrahedra can be arranged in various ways by sharing one or more oxygens between adjacent tetrahedra. There are some 3,500 recognized minerals found on Earth. For our purpose, we can focus on about a dozen.