Zeolites are a group of hydrated aluminosilicates of the alkali or alkaline earth metals (principally sodium, potassium, magnesium and calcium). Zeolites have three-dimensional crystalline frameworks of tetrahedral silica or alumina anions strongly bonded at all corners. The zeolite structures contain (-Si-O-Al-) linkages that form surface pores of uniform diameter and enclose regular internal cavities and channels of discrete sizes and shapes, depending on the chemical composition and crystal structure of the specific zeolite involved. Pore sizes range from about 2 to 4.3 angstroms. The enclosed cavities contain both the metal cations and water molecules. The cations are loosely bound to the lattice and thus can engage in ion exchange. The water molecules can also be reversibly driven off in most zeolites. Views of a typical zeolite structure are shown in the following diagram:

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