The Hawley Medal is being presented to the authors of what is judged to be the best paper in volume 43 2005 of The Canadian Mineralogist. It is awarded to Ronald C. Peterson and Alan H. Grant for their paper on “Dehydration and crystallization reactions of secondary sulfate minerals found in mine waste: in situ powder-diffraction experiments” (pages 1171–1181).

This paper is simply elegant. A new experimental method that has direct application to the study of mineral stability as a function of key environmental factors such as partial pressures of gaseous constituents and temperature is described. Careful observations and...

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