Francesco Capitelli has worked at IC-CNR since 2001. His main research activity is framed along the conceptual line of geomaterials–biomaterials. Geomaterials refer to minerals retrieved in the geological context and synthetical minerals that present chemical–physical–mechanical features similar to those of natural compounds. Their crystal–chemical characterization is achieved through the application of XRD, Raman, FTIR, and SEM-EDS techniques. From the knowledge of these geomaterials, it is possible to realize synthetical compounds that, owing to the several possible chemical substitutions, are requested for technological applications: for example, apatite-based materials are employed in agriculture, in the environment, and in applications related to cultural heritage. Biomaterials such as hydroxyapatite and tricalcium phosphate represent synthetic counterparts of materials present in nature, and they are much appreciated because of their similarities with the mineral fraction of vertebrates' hard tissues. Owing to their crystal–chemical features, which give rise to many possible cationic and anionic substitutions, together with their well-known biocompatibility, the structural investigation of calcium phosphates leads to the design and production of a large class of biomaterials appreciated in biomedical sciences. Author of more than 90 articles published in International Journals; Scopus h-index: 21.