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Zeolites are naturally occurring hydrated aluminosilicate minerals. They belong to the class of minerals known as “tectosilicates”. Most common natural zeolites are formed by alteration of glass-rich volcanic rocks (tuff) with fresh water in playa lakes or by seawater (1). The structures of zeolites consist of threedimensional frameworks of SiO₄ and AlO₄ tetrahedra. The aluminum ion is small enough to occupy the position in the center of the tetrahedron of four oxygen 4+ atoms, and the isomorphous replacement of Si by Al3+ produces a negative charge in the lattice.