## 3 Results
### Raman Spectroscopy
\begin{table}
\begin{tabular}{c c c c c c c} \hline  & \multicolumn{2}{c}{**Leucocratic Fraction**} & \multicolumn{3}{c}{**Melanocratic Fraction**} \\  & **An (mol\%)** & **Other Minerals** & **\% Rx** & **\% Amp** & **Other Minerals** & **Lithotype** \\ \hline
**R1** & - & Prh, Cal & 70 & 30 & - & Metabasite \\ \hline
**R2** & \(23\pm 4\) & Cal, Or & - & 100 & Ep & Silicate marble or Calceschist \\ \hline
**R3** & \(47\pm 7\) & Zem & 42 & 48 & Ttn, Ep, Zeo, Bt &
\begin{tabular}{c} Diorite/Gabbro with \\ Amphibole \\ or Amphibolite \\ \end{tabular} \\ \hline
**R5** & \(33\pm 7\) & - & 100 & - & Dsp & Diorite or Granulite \\ \hline
**R4** & - & Srp, Cal, Or & - & 100 & Hem, Ats & Serpentine schist \\ \hline \end{tabular}
\end{table} 
Table 4: Summary of Raman results for each sample are reported. Amp: Amphibole; Ats: Anatase; Bt: Biotite; Cal: Calcite; Dps: Diopside; Ep: Epidote; Hem: Hematite; Or: Orthoclase; Prh: Prenhite; Px: Pyroxene; Srp: Serpentine; Tnt: Titanite; Zem: Zemannite; Zeo: Zeolite. so the plagioclase of R3 contain both Na and Ca in their mineral structure and fall into the labradorite-andesite interval. Table S1 reports the An(mol%) content of each mineral recognised as plagioclase for R2, R3, and R5. In addition, sample R3 shows the presence of the accessory mineral Zemannite. Concerning the melanocratic fraction, sample R5 mainly shows the presence of pyroxene, in particular, diopside. The melanocratic fraction of sample R3 is made of pyroxene and amphibole in equal percentages, and minor minerals like epidote, zeolite, brookite, and titanite. The overlapping in the same spectrum of peaks belonging to the amphibole and titanite minerals confirms that titanite in the R3 sample is always an inclusion of amphibole, as shown in Figure 10a. Figure 8: **(a)** Raman spectra of pyroxene (black line) and amphibole (red line) from sample R1. In the upper right corner, the spectral interval associated with the discriminative presence of hydroxyl groups between pyroxene and amphibole. **(b)** Prehnite and calcite spectra from sample R1, which have been identified through the comparison with RRUFF reference spectra (black lines). **(c)** Epidemote (blue line) and amphibole (red line) spectra from the sample R2. They mainly differ in the peak position of hydroxyl groups in the 3.200–3.800 cm\({}^{-1}\). Figure 10: **(a)** Amphibole spectrum acquired from sample R3 (green line). The spectrum is defined by characteristic peaks related to titanite and actinolite reference spectra from the RRUFF database. **(b)** Antigorite spectrum (pink line) from sample R4. There is a clear peak overlapping between the reference spectrum from the RRUFF database (black line) and the characteristic peaks of hydroxyl groups at 3.600–3.700 cm\({}^{-1}\). Figure 9: Interval plot with relative errors of the An(mol%) for sample R3 **(a)** and sample R5 **(b)**. Gaussian distribution of An(mol%) of the plagioclase fraction for sample R3 **(c)** and R5 sample **(d)**. From the data collected, sample R5 may be classified as a diorite, a magmatic rock with an An(mol%) less than 50%, or a granulite, a metamorphic rock, which may justify the moderately preferred orientation of melanocratic minerals. The uncertainty in the R3 lithological classification derives from its An(mol%) value which is too close to the cutoff value between gabbro and diorite at An(mol%) equal to 50%. For this reason, R3 is simply labelled as a diorite/gabbro rich in amphibole. Finally, the leucocratic fraction of R4 is composed of a small amount of calcite and orthoclase, a K-feldspar, together with an abundance of antigorite, a mineral belonging to the phyllosilicate serpentinite group usually found in the metamorphosed serpentinites (Figure 10b). The scarce melanocratic fraction consists of amphibole, hematite, and anatase.