Characterization of Stone Tesserae from “Praedia Iuliae Felicis” Mosaics (Pompeii—Italy)

This work illustrates the results of an archaeometric investigation performed on 29 stone tesserae collected from 2021 to 2024 during the restoration campaigns of three mosaic floors at Praedia Iuliae Felicis in Pompeii (Campania, Italy). The tesserae were studied through a micro-analytical approach using Polarized Optical Microscopy (POM), Scanning Electron Microscopy (SEM) with Energy-Dispersive X-ray Spectroscopy (EDS) and Electron Probe Micro-Analyzer with Wavelength-Dispersive Spectroscopy (EPMA-WDS). The aim of the study was to determine the petro-chemical features of the mosaic tesserae and to obtain information about the provenance of the raw materials. The research highlights the use of different types of stone, such as volcanic and sedimentary, of probable local provenance. A single marble tessera was also recognized. In addition, the archaeometric study allowed a better knowledge of the executive technique and contributed to orienting the technical choices of the restoration. Indeed, a complementary study of conservation state of the three mosaic floors was conducted with the aim of better defining strategies for conservation and restoration, paying attention to the compatibility and to the interaction of the restoration products with the characteristics of the raw materials.