I am looking to purchase a couple chisels that will work well in the shale typically found in western New York. I have read several threads and have a general idea of the sizes that I’d need, but I wanted to be sure I got the right type of chisels. Should I get cold chisels or masonry/brick chisels? From what I’ve heard elsewhere online, hardware stores usually say that cold chisels are for metal but I’ve seen them recommended for fossils in several threads. Are either options okay to use? I’m mostly asking in terms of safety.