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Photograph of cylindrical samples of each tuff as used in the experiments. Samples show differences in macroscopic texture, color, and particle size. The Neapolitan Yellow Tuff (NYT) and La Pietra Tuff 1 (LPT‐1) contain abundant and large pumices and lithics within a fine matrix, whereas the Gauro Tuff (GT) and the La Pietra Tuff 2 (LPT‐2) show a more ash‐dominant component.
