Reap, I find this ironstone here in NC. I think it's the same stone anyway. It will get a rust like patina that can be scraped off. Is this the same ironstone? If so, I've never seen it flaked. Cool!None of those are Slate rock. They are all hardstone and made from the Ironstone/Waverly Sandstone I mentioned.
I should just say artifacts, all joking to the side they are real nice