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The scientific activity is mainly devoted to the study of crystal chemistry of minerals (pyroxenes, olivines and spinels) from mafic and ultramafic rocks and the applications in petrological and thermodynamical problems. In addition the scientific interest is focused on order-disorder mechanism in synthetic and natural spinels and their dependence on composition, temperature and time. These studies allowed a revision of a geothermometer based on Mg-Al cations exchange between T and M sites in spinels.