A flexible face-slab has a layer (11) of natural sandstone from which its natural binding material has at least been partially removed, but without disturbing its natural granular structure consisting of sand-grains being in contact with each other. The empty spaces, created in the layer (11) after the removal of the natural binding material are partially or completely filled with a flexible binding agent, which can be a synthetic resin-based binder. One side of the layer (11) of natural sandstone is strengthened by a base layer (12) that acts as a stabilizing layer. This may incorporate a mesh (13), woven cloth material, or threads of natural or an artificial material. The total thickness (17) of the sandstone layer (11) and the base layer (12) after completion of the manufacturing process may range between 2 and 6 mm.