Unpolarized FTIR spectra of quartz phenocrysts originated from silicic pyroclastic fallout deposits (Bükk Foreland Volcanic Area and Kaharoa eruption, New Zealand).https://hdl.handle.net/21.15109/ARP/IJFSLKHencz, MátyásBiró, TamásKovács, István JánosARP2025-06-192025-10-20T08:37:06ZThe dataset contains raw Fourier-transform infrared spectras, quartz phenocrytal photos and evaluation of FTIR data to quantify the structural hydroxyl content of quartz phenocrysts originated from pyroclastic fallout deposits of the Bükk Foreland Volcanic Area (BFVA, Hungary) and of the AD1314 Kaharoa eruption (New Zealand). The obtained spectra can be processed using the OPUS® software (preferably with OPUS 7.2.139.1294 version).Earth and Environmental SciencesFTIRquartzpyroclasticfalloutHencz, M., Biró, T., Kovács, I.J., Stalder, R., Németh, K., Szakács, A., Pálos, Zs., Pécskay, Z., Karátson, D. 2021. Uniform "water" content in quartz phenocrysts from silicic pyroclastic fallout deposits - implications on pre-eruptive conditions. European Journal of Mineralogy, 33, 571-589. https://doi.org/10.5194/ejm-33-571-2021, doi, 10.5194/ejm-33-571-2021, https://doi.org/10.5194/ejm-33-571-20212025-06-19Hencz, Mátyás2025-06-19CC BY-NC 4.0