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It is with great pleasure and with enthusiasm, I propose Patrick Cordier for MSA Dana medal. The former President and Vice-President of the Societe Francaise de Mineralogie et de Cristallographie and co-author of the book for the general public on mineralogy Ce que disent les mineraux (“What do the minerals say”), he is one of the few people that capture the essence of modern mineralogical research allied to concepts coming from materials science and physics. A physicist by training and now professor of physics at the University of Lille, he embarked on the route to become one of the world’s leading mineralogists by studying the plastic deformation of quartz and his Ph.D. in 1989.What could be simpler than to understand the plasticity of mineral with the composition of SiO2? Indeed, in reality it was a very difficult task, a subject rich in experimental folk law and dubious observations, the young researcher developed a methodology based on rigorous experimental protocol, quantitative state-of-the-art transmission electron microscopy (TEM) characterization of defect densities and their crystallography, and pertinent theoretical analysis of the results. This first adventure into the field of mineralogical research produced several well-documented publications using mechanical experiments, heat treatment, infrared spectroscopy, electron spin resonance (ESR), and, of course, TEM. The major results from this early period were the first and, I believe even today, the only determination of the equilibrium concentration of the hydro-garnet defect in quartz and the development of new vision of the importance of hydro-garnet defect (4H in Si site) (identified by ESR) in the hydrolytic weakening of quartz facilitating the easy glide of dislocations. In the following years, Patrick expanded his activities to include the characterization of shocked minerals from meteorite impacts and interstellar material. The collaborative work on Comet 81P/Wild 2, published in two …

Presentation of the Dana Medal of the Mineralogical Society of America for 2016 to Patrick Cordier