Physicochemical or geochemical

• Horwell, C. J., Sargent, P., Andronico, D., Lo Castro, M. D., Tomatis, M., Hillman, S. E., Michnowicz, S. A. K., Fubini, B., (2017), The iron-catalysed surface reactivity and health-pertinent physical characteristics of explosive volcanic ash from Mt. Etna, Italy, Journal of Applied Volcanology, 6(1): 12, 10.1186/s13617-017-0063-8