Chisel used by stonemason. It has a long flat rectangular blade that tapers to a point at one side. It has a rounded shaft with worn ridges around the circumference. The end of the chisel shows signs of frequent use with the edge well worn and curved over.
Stone was worked using a range of tools including saws and chisels. Stone mason's tools have changed very little over the centuries. Finer shaping and detail was worked by striking chisels like this with a large wooden mallet.