en Research Paper Research Paper The structural properties of a natural clay sample (51% kaolinite) were tweaked to suit specific applications. H₂SO₄ and NaOH (1.0 M) treatment caused structural alterations and a significant release of Al ions compared to Si ions. Chemical treatment caused structural alterations, according to XRD analysis. FTIR analysis also indicated higher density of polar surface groups upon treatment which affected the corresponding dielectric behaviors. Dielectric measurements shown the suitable application of the materials either as dielectrical insulator and this dependent on the applied frequency. Acid treated kaolinite was reported to be a promising dielectric at 10 and 1000 Hz. With appropriate mass attenuation coefficients (μ/ρ) 12.098-12.182 cm²/g and a high half value layer of 10 cm at 10 keV, kaolinite and other treated forms were adequate shielding materials. Kaolinite,Acid/alkali treatment,Physicochemical characteristics,Dielectric and shielding properties 1 14 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-3410-1&slc_lang=en&sid=1 Anas Al-Reyahi 1800319475328460014762 1800319475328460014762 No Department of Physics, Faculty of Science, The Hashemite University, P.O. Box 330127, Zarqa 13133, ‎Jordan. Salem Yahya Degs yahyasalem1971@gmail.com 1800319475328460014763 1800319475328460014763 Yes Department of Chemistry, Faculty of Science, The Hashemite University, P.O. Box 330127, Zarqa 13133, ‎Jordan. Ayman Issa 1800319475328460014764 1800319475328460014764 No Department of Chemistry, Faculty of Science, The Hashemite University, P.O. Box 330127, Zarqa 13133, ‎Jordan Zyad Khattari 1800319475328460014765 1800319475328460014765 No Department of Physics, Faculty of Science, The Hashemite University, P.O. Box 330127, Zarqa 13133, ‎Jordan. Mohammed Abu Al Sayyed 1800319475328460014766 1800319475328460014766 No Faculty of Science, University of Tabuk, Saudi Arabia