A dark-brown glauconite-rich sand cemented by iron oxides characterizes the landscape and the typical architecture of the Hageland: the so-called ferruginous sandstone of the Diest Formation. This paper describes the results of a material-technical research of this ferruginous sandstone, excavated from sedimentary beds at five locations, with the aim to evaluate their potential use for restoration purposes. The correlation of the physical-mechanical properties of the ferruginous sandstone with either ultrasound or petrographic characterization was evaluated as part of a quality assessment of the material. Although the evaluation of the ultrasound wave velocity proved useful for the selection of the samples, the statistical analysis evidenced only a general correlation with the different physical-mechanical properties. The petrographic analysis, on the other hand, could effectively address the lithification properties of the ferruginous sandstone, which could be positively related to the density, the porosity and the strength characteristics of the material.