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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 non metallic elements carbon and silicon form giant covalent structures. The structure of the three allotropes of carbon (diamond, graphite and fullerenes), silicon and silicon dioxide (silica). DIAGRAMS. 1  It is possible for many atoms to link up to form a giant covalent structure or lattice. TYPICAL PROPERTIES of GIANT COVALENT STRUCTURES. 2  This type of giant covalent structure is thermally very stable and has a very high melting and boiling points because of the strong covalent bond network (3D or 2D in the case of graphite below).