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Total alkali versus silica classification diagram and representative bi-plots for the Moscerini pumice #37 and of some potential correlative tephra from Ischia Island activity. Data source TM-33-1c, TM-32-2a and TM-24–3 (glass-WDS)50; POP2b (glass-WDS)32; Monte Epomeo Green Tuff (glass-WDS)51.
