Stonemason's chisel (12)

Chisel type tool used by stonemason.  It is lozenge shaped with a square profile tapering to a point at either end.  Irregular grooves are incised along the centre of the two opposite sides.    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.