Backscattered electron and major element maps of pumice from the 1991 eruption of Mount Pinatubo, Philippines. Samples provided by Mauro Rosi; for detailed description of location and eruptive stratigraphy see the following paper: Rosi, M., Paladio-Melosantos, M., Di Muro, A., Leoni, R. and Bacolcol, T., 2001. Fall vs flow activity during the 1991 climactic eruption of Pinatubo Volcano (Philippines). Bulletin of Volcanology, 62, pp.549-566. Backscattered electron maps were obtained on a Zeiss Sigma HD Field Emission Gun analytical scanning electron microscope (ASEM). Major element maps were obtained on the same ASEM using dual Oxford Instruments X-max 150 mm2 energy dispersive silicon drift detectors.

A compilation of mineral and glass compositions erupted at Villarrica volcano, Chile, measured by electron microprobe. Data are sourced from published articles, theses and unpublished works. Minerals and glasses are from deposits erupted over the last 100ka. This is supporting data for the manuscript entitled 'Insights into Magma Storage Beneath a Frequently Erupting Arc Volcano (Villarrica, Chile) from Unsupervised Machine Learning Analysis of Mineral Compositions' by F. O. Boschetty, D. J. Ferguson, J. A Cortés, E. Morgado, S. K. Ebmeier, D. J. Morgan, J. E. Romero and C. Silva Parejas.