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Albert Chan, David M. Jenkins, and M. Darby Dyar

Albert received a B.S. in Mechanical Engineering from the Massachusetts Institute of Technology and M.S. in Geophysics from the California Institute of Technology. His research interests include studies of Earth s interior structure and chemical composition using seismic data and its relation to geodynamics models and high-pressure mineral physics experimental results. His work with David Jenkins at Binghamton University regarding chlorine partitioning in amphibole constitutes experimental research in geochemistry, resulting in the following publication of the subsequently awarded paper.

David received his doctorate at the University of Chicago in 1980 for the experimental investigation of several reactions relevant to the mineralogy of the upper mantle under the supervision of Robert Newton. He worked for a year as a post-doctorate for John Holloway at Arizona State University on a radioactive waste contaminant project. He then returned to the University of Chicago to work as a post-doctorate for Julian Goldsmith, investigating the stability of the brittle mica margarite, relative stabilities of clinozoisite and zoisite, and the high-pressure hydrothermal melting and order-disorder of albite. In 1984 he joined the faculty at the State University of New York at Binghamton (Binghamton University) where he augmented the existing experimental petrology facilities to expand the range of pressures and temperatures that could be attained. Research at Binghamton University has focused primarily on various aspects of amphibole crystal-chemistry, stability, and changes in amphibole composition in response to changes in pressure, temperature, and coexisting mineral assemblage. Additional research has been done on such things as the infrared spectroscopy of sheet and chain silicates, anion inter-diffusion kinetics, stability limits of blueschist-facies rocks, and more recently chlorine incorporation into calcium amphibole. In 2001 he was named a Fellow of the Mineralogical Society of America, and in 2004 received the Chancellor’s Award for Excellence in Scholarship and Creative Activities. While at Binghamton University, he has had the privilege of working with many talented graduate and undergraduate students, such as the lead author of this award.

Darby is a mineral spectroscopist in the Department of Astronomy at Mount Holyoke College, and also a Senior Scientist at the Planetary Science Institute. She studies the distribution of hydrogen and oxygen throughout the solar system, focusing on terrestrial, lunar, meteoritic, and returned samples. She collaborates with many scientists in the international community using the resources in her Mineral Spectroscopy Laboratory, founded in 1986, to enable Mössbauer, Raman, laser-induced breakdown spectroscopy, and other types of analyses of mineral and geological samples, and to provide rock and mineral standards for many other types of analyses. Darby received her B.A. from Wellesley College and her Ph.D. from MIT, followed by a post-doc at Caltech and faculty positions at the University of Oregon, West Chester University, and Mount Holyoke. She is a long-time Associate Editor for the American Mineralogist, and belongs to the Association for Women Geoscientists, NASLIBS, GSA, and AGU. She is the 2016 recipient of the G.K. Gilbert Award from the Geological Society of America for her outstanding contributions to the solution of a fundamental problem of planetary geology.

The 2017 Hawley Medal was awarded for the paper ‘Partitioning of chlorine between NaCI brines and ferro-pargasite: Implications for the formation of chlorine-rich amphiboles in mafic rocks published in The Canadian Mineralogist 54, part 1.

Chan, Jenkins and Dyar conducted hydrothermal experiments to measure the partitioning of chlorine between brine and amphibole. The careful characterisation of the reactants and products and the development of a thermodynamic model to relate amphibole chemistry and brine chemistry allowed the results to be applied to high grade metamorphic rocks and to seawater – ocean floor alteration. The work provides an excellent example of the application of mineralogy in the understanding of earth processes.

We are delighted and honored that our work on chlorine partitioning into ferro-pargasite has been selected for the Hawley Medal of the Mineralogical Association of Canada in recognition of the 2016 best paper in the Canadian Mineralogist. It is particularly fitting that this paper appeared in the issue honoring the prestigious career of Frank Hawthorne, a mineralogist who has influenced many of us who have studied amphiboles. We are very grateful to editor Lee Groat for encouraging our participation in this special issue. Thanks are extended to Prof. Jaime Barnes (University of Texas, Austin) for asking the simple question of how one can synthesize chlorine-bearing amphibole, which, in turn, has set into motion a series of research projects at Binghamton University on that very topic, with the initial results appearing in the paper being recognized today. It is indeed an honor to have our article selected as the best paper in a journal that reaches a world-wide readership and publishes numerous excellent articles with an equally world-wide authorship.

We extend our heartfelt thanks and appreciation to the Mineralogical Association of Canada and to the selection committee for nominating this article for the 2016 Hawley Medal.

Respectfully yours,

Albert Chan, David M.Jenkins, and M. Darby Dyar