This may be noticed also as an advantage or disadvantage since the sandstone over time will develop into soiled from dust and algae development. Sandstone: A specimen of sandstone around two inches (5 centimeters) across. A better perspective of the specimen is within the Photograph below. But just one materials https://lxfjsccj81469.tinyblogging.com/fascination-about-sandstone-retaining-wall-blocks-74800431