Kaolinized granite is one of the least studied geological materials. Kaolinization of the granites usually described as a process, controlled by feldspar dissolution kinetics, the precipitation kinetics of silica minerals and the initial log a (K+/H+) of the fluids that interacted with the granites. Data on kaolinized granite deposit in Bosnia and Herzegovina, studied here, is very scarce and present study shows thorough characterisation of the primary material along with results of its chemical/thermal treatment with aim to form the core-shell structure. In particular, the series of samples were treated by varying concentrations of acids, removing selectively the metal ions in the kaolinite fraction.

This procedure is followed by the thermal treatment of the samples, generating the ceramic shell around the granite core, a unique and innovative structure. The idea which will be presented is that such procedure could be used for extraction of the rare earth elements while at the same time generating these specific structures with minimum treatment, thus being very energy efficient. Application of the new structures is aimed mostly at the catalytic purposes, which will be shown in detail.