Games & Recreation » Hobbies & Crafts » Trying to figure out what this hobby is called and where I can get it from.?

Trying to figure out what this hobby is called and where I can get it from.?

Back in Elementary school, one of my best friend s dad had a hobby, that involved taking huge dried (very dense) rocks of Georgia clay (or something that looks like it) and chipping away bits of it to eventually excavate something, one notable thing I remember is a foot long scale model pirate ship

Anyone have any ideas or am I crazy?

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