I found this piece at my local rock shop. The person who sold it to me didn’t know what it was, and it took me a few hours of searching online to find it–a lot of my search terms brought up tiger’s eye, which this clearly is not.
I don’t know what other people use it for, but for me this stone is wonderfully calming and grounding.
There’s a shop on Etsy that sells jewelry made from it sometimes.