Solids of the zeolite type combine pores of uniform dimensions with large void fractions and are important in applications such as catalysts and as host materials for intercalation. The regular pores influence the physical and chemical properties of the solid while the zero- to three-dimensional connectivity of the pore system can determine the electronic properties of host-guest compounds. Here, a simple new method for the classification of these solids is presented. Which also leads to the prediction of new classes of microporous materials.