Proceedings of the NATO Advanced Research Workshop on the Application of Natural Microporous Materials for Environmental Technology, Smolenice Castle, Slovakia, 26-30 October 1998Clay Minerals.- Structure and Chemical Characteristics of Modified Clays.- Pillared Clays: Chemistry and Prospects.- Hg2+ Trapping by Thiol Functionalised Mesoporous Silica Molecular Sieves.- The Use of Clays as Sorbents and Catalysts.- Contaminant Plume Management Utilising In Situ Organoclay Sorbent Zones.- Atomistic Computer Modelling of Chiral Pillared Clays.- Natural Microporous Materials of Central Slovakia.- Sorption and Leaching Properties of the Composites and Complexes of Natural Microporous Materials.- Experimental Study on the Formation of Heavy Metal Sulphides Using Layer Silicates: Environmental Aspects.- Diffusion of Radionuclides in Clay-Based Ceramics.- Natural Zeolites.- Zeoponic Substrates for Space Applications: Advances in the Use of Natural Zeolites for Plant Growth.- Natural Zeolites and Nuclear-Waste Management: The Case of Yucca Mountain, Nevada, USA.- Interaction of Actinides with Natural Microporous Materials.- Environmental Applications of Natural Zeolitic Materials Based on their Ion Exchange Properties.- Zeolitised Materials of the Mediterranean Area as Adsorbents for Environmental Protection.- Distribution of Industrial Minerals in Sardinia (Italy): Clinoptilolite Bearing Rocks of the Logudoro Region.- Application of Microporous Materials for the Recovery of Nutrients From Wastewaters.- Transition Metal Complexes Supported on Natural Zeolitic Materials: An Overview.- Heterogeneous Catalysis at Supercritical Conditions Using Microporous Materials. Environmental Advantages.- Properties of NaOH-Treated Slovak Zeolitic Tuff and its Sorption Ability Towards Some Cations.- Zeolites in Aquacultural Primary Production.- Sorption of Cadmium(II) and Nickel(II) on a Natural Zeolite Rich in Clinoptilolite.- Environmental Applications of Modified Natural Zeolites.- Roml#£