FLAGSTONES: these rocks with high contents of quartz have a foliable varied structure, and varied colours, too. They are ochery sand, green, black and red oxide. They are very useful because of their resistance in order to cover horizontal and vertical surfaces, exteriors or interiors. It’s generally put in irregular shapes, stick with concrete, changeable thicnesses, due to add new technologies on the cutting. They are sold squared, in different superficial ended that goes from rustic, shone, sand, apart from its irregular, natural surface. It doesn’t need any kind of maitenance, only water and brush according with the customers’ preferences.