Our study on the Pannonian clays from Halmagiu area (Arad County) has focused on their mineralogical and chemical composition, as well as on their technological characterization in the view of establishing their potential fields of usage. The information retrieved from the X-ray diffraction analysis (on both oriented and bulk samples), completed with the IR spectroscopy and thermal analysis results allowed the identification of the following mineral phases: kaolinite, montmorillonite, vermiculite, muscovite/illite, chlorite, calcite, quartz, plagioclase feldspars, pyrite and hematite. Additionally, the granulometric features, the physical-chemical transformations following the thermal treatment and the technological characteristics (water absorption capacity, apparent porosity and density) point to the fact that the fine clays from Hălmagiu could be used as raw material for coarse porous ceramics as building materials (bricks, roof tiles), or to a lesser extent, as a component in the composition of semifine ceramics (wall and floor tiles).