Non-Vascular Ceramic Sherds Coming from Two Italian Etruscan Settlements: Peculiarities and Interpretation of Their Possible Use

Peculiar non-vascular ceramic slabs of uncertain use were found in two different Etruscan settlements of the Po Delta region (San Basilio di Ariano nel Polesine and Adria, North-East Italy) dated back to the first millennium BC. Different interpretations concerning the primary role of these fragments have been suggested by previous scholars. To bring to light an understanding of the construction processes that appear to be unique to the San Basilio and Adria settlements, a multi-analytical approach has been carried out. Macroscopic observations enabled these materials to be preliminary subdivided into groups based on chromatic features, followed by the identification of their chemical composition through FTIR-ATR spectroscopy. Moreover, the open porosity was estimated by the total water absorption test, and the superficial morphology and elemental composition of specific samples were analyzed using SEM-EDS. Furthermore, the firing temperature of a few selected fragments was evaluated by the TGA-DSC technique in order to investigate ancient production techniques. The results of the research lead us to consider the role of these peculiar non-vascular ceramic slabs as building materials due to their specific protective properties, considering the environmental conditions of the Po Delta region.