PORPHYRY: this resistant, big, hard rock of volcanic, metamorphic origin, is one of the favourites at the moment of covering buss depot soils, traffic and pedestrian entrances, terraces and so long. It comes in classical cobbles 10x10 and 3x10. The 2cm thick of rustic is used in kitchen covers, walls, etc. It’s placed with simple mortars of cement or in sand base.
It doesn’t ned any kind of special maintenance apart form water and brush.