Carmichael is an Assistant Professor in the Department of Geology at Appalachian State University. She studies the mineralogy of manganese ore deposits and the characteristics of manganese biominerals in caves, in addition to her work on Si-deficient volcanic rocks and the geochemistry of mass extinctions. Her research heavily involves scanning and transmission electron microscopy, X-ray diffraction, and spectroscopic techniques. She is studying the biomineralization process that occurs in caves when microbes utilize reduced metals, such as iron, as a source of energy, much like plants harvest light energy via photosynthesis. “These are minerals that do not have organic carbon as part of their makeup and the microbes are not using traditional pathways to obtain food. They are using metals instead of carbon as an energy source,” Carmichael said. The iron and manganese oxide mineral deposits the professors collect from caves in eastern Tennessee and southwest Virginia are a result of t