I wouldn't think that hammers are used to "blast" rocks. A mallet usually has a wooden head, so would be no use on rock. A mace is something different.
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AnonymousIn the US, jackhammer or hoeram.A jackhammer and a sledgehammer are different things. A jackhammer is powered by compressed air (normally). A sledgehammer is wielded by hand. I had assumed that Gamboler meant a non-mechanical hammer, but I suppose that may not be right.