BELGIAN BLOCKS (SETTS) - granite, limestone, sandstone, slate
Belgian blocks or setts are a form of quarried stone pavement, typically rectangular in shape, six to twelve inches in length and half that dimension wide. A Belgian block is defined by its shape, rather than its material, which is most often granite, but could also be limestone or sandstone. They also vary in terms of the smoothness of their surface, ranging from very slick and almost glassy to very rough. Making their appearance in North American cities during the second half of the 19th century, Belgian blocks were used on streets bearing traffic with the heaviest loads.