## 5 Results
### Petrophysical Properties
From the physical-mechanical point of view, considering the PLT resistance data of metadolostone and sandstone samples (Table 4), a general positive exponential correlation was observed between the Is\({}_{(50)}\) index (MPa) versus bulk density (Figure 13a) and the Is\({}_{(50)}\) index versus open porosity to helium (Figure 13b), with determination coefficients R\({}^{2}\) equal to 0.65 and 0.63, respectively. Considering all samples (including the \"sandstone\" _s.l._) the R\({}^{2}\) value decreased due to the different trend shown by the population. Therefore, the highest values of the PLT index were found in the metadolostone samples (4.76 \(\pm\) 2.45, 2.74 \(\pm\) 1.30, 2.32 \(\pm\) 1.84 MPa, Table 4), which had lower porosity, while the lowest values, with an average of 0.72 \(\pm\) 0.52 MPa, occurred in the most porous samples (sandstone), as they had a carbonate \"cement\" of poor compactness and resistance. The \"sandstone\" _s.l._ samples, on the other hand, by virtue of a carbonation of lime-based binder, showed a much higher resistance value than that of sandstone, with an average value of 2.55 \(\pm\) 1.18 MPa (Table 4). The values of the standard deviation show a greater variability of the mechanical resistance in metadolostone samples due to their more brittle behaviour compared to sandstone and \"sandstone\" _s.l._, which, on the other hand, showed better absorption and distribution of mechanical stresses. \begin{table}
\begin{tabular}{l c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & \multirow{2}{*}{**Lithology**} & **W** & **H** & **P** & \(\mathbf{D_{e}}^{2}\) & **Is** & **F** & \(\mathbf{Is_{(50)}}\) & \multicolumn{2}{c}{\(\mathbf{R_{C}}\)} & \multicolumn{2}{c}{\(\mathbf{R_{T}}\)} \\ \cline{3-13}  & & **mm** & **mm** & **kN** & **mm\({}^{2}\)** & **N/mm\({}^{2}\)** & _/_ & **MPa** & **MPa** & **kg/cm\({}^{2}\)** & **MPa** & **kg/cm\({}^{2}\)** \\ \hline TAP32 & \multirow{2}{*}{Laminated metadolostone (from temples)} & 17.6 & 10.0 & 1.45 & 223.5 & 6.49 & 0.58 & 3.77 & 75.4 & 768.6 & 3.0 & 30.7 \\ TAR3 & & 14.9 & 12.0 & 0.80 & 228.0 & 3.51 & 0.58 & 2.05 & 40.9 & 417.4 & 1.6 & 16.7 \\ TAR5 & & 18.1 & 15.5 & 0.60 & 356.2 & 1.68 & 0.65 & 1.09 & 21.7 & 221.6 & 0.9 & 8.9 \\ \hline TAC2 & Lam. dol. (quarry) & 18.5 & 11.5 & 2.85 & 270.9 & 10.52 & 0.61 & 6.38 & 127.6 & 1301.4 & 5.1 & 52.1 \\ \hline TASC3 & \multirow{4}{*}{Laminated metadolostone (from outcrops)} & 17.7 & 15.5 & 3.90 & 348.3 & 11.20 & 0.64 & 7.19 & 143.7 & 1465.5 & 5.7 & 58.6 \\ TASC4 & & 16.2 & 7.5 & 1.85 & 154.2 & 12.00 & 0.53 & 6.41 & 128.2 & 1307.1 & 5.1 & 52.3 \\ TASC5 & & 17.7 & 8.5 & 1.00 & 191.6 & 5.22 & 0.56 & 2.93 & 58.6 & 597.3 & 2.3 & 23.9 \\ TASC6 & & 17.8 & 15.5 & 4.45 & 351.3 & 12.67 & 0.64 & 8.15 & 162.9 & 1661.3 & 6.5 & 66.5 \\ TASC8 & & 18.9 & 15.0 & 2.75 & 361.0 & 7.62 & 0.65 & 4.93 & 98.6 & 1005.2 & 3.9 & 40.2 \\ \hline \multirow{4}{*}{ \begin{tabular}{l} TAP45 \\ TAR2 \\ TAR4 \\ TAR7 \\ \end{tabular}  } & **Average** & **17.5** & **12.3** & **2.18** & **276.1** & **7.88** & **0.60** & **4.76** & **95.3** & **971.7** & **3.8** & **38.9** \\ \cline{1-1}  & **St. Dev. ** & **1.2** & **3.2** & **1.38** & **80.3** & **3.94** & **0.04** & **2.45** & **48.9** & **499.1** & **2.0** & **20.0** \\ \hline TAP45 & \multirow{4}{*}{Brecciated metadolostone (from temples)} & 18.7 & 15.5 & 1.85 & 368.1 & 5.03 & 0.65 & 3.27 & 65.3 & 666.1 & 2.6 & 26.6 \\ \cline{1-1}  & & 17.4 & 9.5 & 0.50 & 210.5 & 2.38 & 0.57 & 1.36 & 27.2 & 277.6 & 1.1 & 11.1 \\ \cline{1-1}  & & 17.5 & 12.0 & 0.65 & 267.4 & 2.43 & 0.60 & 1.47 & 29.4 & 299.8 & 1.2 & 12.0 \\ \cline{1-1}  & & 16.8 & 8.0 & 0.65 & 170.9 & 3.80 & 0.55 & 2.08 & 41.6 & 424.2 & 1.7 & 17.0 \\ \hline TAC1 & \multirow{4}{*}{Brecciated metadolostone (from quarry)} & 16.3 & 10.0 & 1.65 & 206.9 & 7.97 & 0.57 & 4.55 & 91.0 & 928.4 & 3.6 & 37.1 \\ \cline{1-1}  & & **(from quarry)** & 19.5 & 13.0 & 1.90 & 322.8 & 5.89 & 0.63 & 3.71 & 74.3 & 757.4 & 3.0 & 30.3 \\ \hline \multirow{4}{*}{\ \begin{tabular}{l} TAC1 \\ TAC3 \\ \end{tabular}