Chemical reactions occurring at the mineral-fluid interfaces are ubiquitous on Earth and other planets. They control the transport and distribution of a wide range of nutrient, carbon, metal, and organic and inorganic contaminants. In this course, we will learn the fundamental principles concerning mineral surface properties, element distribution in aqueous solutions and at the mineral-water interface, as well as a range of analytical techniques that are relevant to these interfacial reactions. We will also host guest lectures on selected topics and tour user facilities (if schedule allows).