To reach the objectives, the workload was divided into four tasks, using main analytical techniques such as Scanning Electron Microscopy (SEM), Electron Microprobe Analysis (EPMA), Secondary Ion Mass Spectrometry (NanoSIMS), Transmission and Reflectance Spectroscopy, Laser Fluorination and Thermodynamic Modeling. During the first task, the petrographic history of primitive achondrites was investigated in order to define new classification criteria amongst primitive achondrites and understand their parent body history. This work has led to the discovery of a new group of primitive achondrites, the tissemouminites. The second task was devoted to the reflectance and transmittance spectroscopy analyses of terrestrial standards and achondritic samples, so far without any substantial results. During the third task, hydrogen and chlorine abundances and isotopic composition have been carried out on NAMs and apatites in a range of achondritic samples, from primitive achondrite acapulcoites and lodranites, to lunar samples. Both these studies have led to the same main conclusion, that a water source was incorporated into various amount amongst the inner solar system planetesimals, and that this source of water must have incorporated some nebular hydrogen, as revealed by the low hydrogen isotopic composition measured in both acapulcoites-lodranites and lunar samples compared to the present-day Earth. Finally, the last task was to engage and disseminate the results to a diverse audience. Outreach events to raise awareness of planetary studies, in particular to promote woman in science, were conducted. Moreover, an educational trilingual website has been elaborated and is actively updated. This work opened and strengthened new and ongoing national and international collaboration with the University of Florence (Italy), the Open University (UK), Arizona State University (USA) and Bayreuth Geoinstitut (Germany). Results achieved in POSEIDON are of very high-quality and novelty, and were presented at many conferences, workshops, seminars, publications, media.
