**Preface to "Zeolites"**

Zeolites and zeolite-based materials are characterized by unique physical and chemical properties that can be used for numerous and important applications. These properties arise directly from their specific structure, i.e., the system of channels and chambers characterized by well-defined molecular dimensions. If thermal stability, chemical resistance, the possibility of generating active sites, and sorption and ion-exchange properties are taken into account, it is not surprising that zeolites play an extremely important role in various applications of chemical technology, and their importance continues to increase.

This Special Issue aims to attract original contributions in topics related to zeolites, covering aspects such as the origin of such materials, their characterization, and their applications in different areas. It presents reports on the unique methods of synthesis of zeolites and improvement of existing ones, as well as structural characterization and their potential use in various fields. I believe that this collection outlines the current state of the art in the field of zeolitic materials and will become a source of new ideas resulting in the development of this group of minerals.

I would like to thank the contributing authors and colleagues acting as peer reviewers for their efforts in preparing high-quality manuscripts.

> **Magdalena Kr ´ol, Paulina Florek** *Editors*
