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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.
Much of the silicon and oxygen in the Earthâs crust is present as the compound silicon dioxide also known as silica. Silicon dioxide has a giant covalent structure.Part of this structure is shown in the diagram-oxygen atoms are shown as red, silicon atoms shown as brown:t has a very high melting point (1,610 Â°C) and boiling point (2,230 Â°C), is insoluble in water, and does not conduct electricity. These properties result from the very strong covalent bonds that hold the silicon and oxygen atoms in the giant covalent structure.