A brick hammer is a great tool for many hardscaping projects. It’s one of the most used tools in my tool bag.
While a "mason's" or brick hammer is designed for cleanly breaking bricks, it can also be used to break rocks, hammer concrete, split pavers, drive stakes, and scrape dried cement. So do not get hung up on the name: it is a multipurpose tool.
Use the square, blunt side for breaking bigger pieces. Use the thinner, finer side for more delicate hammering. If you need to chip a small of piece of stone but don’t want to risk breaking the whole thing, a brick hammer is the right tool for the job.
You can find brick hammers at most home improvement stores. I recommend buying one for almost any hardscaping project.