Data set 1. FTIR spectra

This dataset contains the full Fourier-transform infrared (FTIR) spectra of the phlogopite mining residue used as the ceramic raw material. The dataset includes: raw spectral data exported directly from the FTIR instrument (.csv); the processed FTIR spectrum used to generate Fig. 10 (.png); absorption bands associated with Si–O stretching, Mg–O vibrations, OH groups, and characteristic phyllosilicate structures; annotations identifying the main vibrational modes relevant to phlogopite-based materials. This dataset provides the chemical-bond information needed to interpret the functional groups in the precursor material and supports the discussion of the mineralogical features included in the manuscript.