Global MIR to FIR spectra of the grains analysed, including large regions of interest for some of the grains from chamber A (left) and chamber C (right). Reference spectra for major species identified in the Ryugu samples spectra such as carbonates: dolomite, Roush (2021); magnesite, Roush (2021); breunnerite Mg_0.78Fe_0.22CO₃, (this work) and phyllosilicates: saponite, serpentine, Glotch et al. (2007), are displayed for comparison (mineral compositions are given in Table A.1). For some grains with a large carbonate contribution to the spectrum, we also display the spectrum of dolomite, the carbonate the closest to the measured band positions and intensities. In addition, in the lower right panel are displayed the spectra of two CI1 meteorites closely related to the composition of the Ryugu samples, Orgueil (this work, measured under the same conditions in a diamond cell) and Ivuna (measured in a KBr pellet at 300°C, from Beck, Pierre (2012): MIR absorbance spectra of bulk CI chondrites in KBr pellets at ambient temperature, 150°C and 300°C. SSHADE/GhoSST, OSUG Data Center, https://doi.org/10.26302/SSHADE/EXPERIMENT_LB_20170719_001).