Physicochemical or geochemical

• Damby, D. E., Llewellin, E. W., Horwell, C. J., Williamson, B. J., Najorka, J., Cressey, G., Carpenter, M. A., (2014), The α-β phase transition in volcanic cristobalite, Journal of Applied Crystallography, 47, 1205-1215, 10.1107/S160057671401070X

Physicochemical or geochemical

• Horwell, C. J., Stannett, G. W., Andronico, D., Bertagnini, A., Fenoglio, I., Fubini, B., Le Blond, J. S., Williamson, B. J., (2010), A physico-chemical assessment of the health hazard of Mt. Vesuvius volcanic ash, Journal of Volcanology and Geothermal Research, 191(3-4), 222-232, 10.1016/j.jvolgeores.2010.01.014
• Le Blond, J. S., Cressey, G., Horwell, C. J., Williamson, B. J., (2009), A rapid method for quantifying single mineral phases in heterogeneous natural dust using X-ray diffraction, Powder Diffraction, 24(1), 17- 23, 10.1154/1.3077941
• Horwell, C. J., Sparks, R. S. J., Brewer, T. S., Llewellin, E. W., Williamson, B. J., (2003), The characterisation of respirable volcanic ash from the Soufriere Hills Volcano, Montserrat, with implications for health hazard, Bulletin of Volcanology, 65, 346-362, 10.1007/s00445-002-0266-6