Extended Data Fig. 3: Image analysis example for crystallinity and vesicularity estimates.
From: Shifting melt composition linked to volcanic tremor at Cumbre Vieja volcano
(a) Backscattered electron image of a representative Type A ash clast from sample CAN-TLP-0212. (b–f) Traced amounts of vesicles, clinopyroxene, olivine, plagioclase, and Fe-Ti oxides used to calculate vesicularity and crystallinity. For this sample, we obtain a vesicularity of 11.0 vol% and a vesicle-free crystallinity of 25.6 vol% (Cpx: 11.2 vol%; Plag: 9.5 vol%; Ol: 2.9 vol%; Ox: 2.0 vol%).
