This is what I believe to be a moss agate or possibly Jasper. Found in decorative river rock at my local grocery store. 🤷‍♀️ This stone reminds me of a pregnant belly. It even has a little belly button. When I found it it was in the rough. I started with a sandpaper grit of 60 And worked my way up to 7,000 grit. All done by hand without machine.