A rock hammer is a tool used by rock climbers and geologists to break or chip away small pieces of rock. It is similar to a small pickaxe. Full definition
He just keeps plugging away, digging his tunnel with his little rock hammer for twenty years, without telling anyone. (gapingvoid.com)
Then, on January 12th, just six days after the tweet that rocked the Hammer world, Slaven Bilic took to a press conference. (bracethehammer.sbnation.com)
At low tide, visitors prowl the mudflats in search of sunken fossils and scavenge the shoreline jumble, rock hammers in hand. (discovermagazine.com)