How best to roughen the edges of natural stone slabs that have been cut using a cut off saw

When I lay natural stone slabs, if I cut the slabs, I use a chisel to chip the cut edge to make it rougher rather than clean and straight. Whilst this does work, I feel there must be a better way of doing this. Does anyone have any suggestions for a better way to achieve a rougher edge?
 
I have a 4lb Scottish Dyker's hammer used for walling - mainly sandstone - guess it would roughen up edges of slabs...but it's heavy to use. A waller/mason's hammer might be better...it has an end specifically for dressing stone.
 
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