Thread: Hone ID?

Hi Guys
I know hone identification is difficult even at the best of times (label on box, hone in hand)
Any thought on what this one is? A friend of mine got it from an old carpenter. He'd used it his whole career around 60 years apparently. It's really hard and smooth, difficult to lap even with a diamond pad. It looks a lot like wood, something about it reminds me of Arkansas stone except it doesn't cut like it. I tried it out on a razor but really have very little to compare it to. It left the razor shaving arm hair easily, haven't tried shaving yet. If you have an idea let me know, or just enjoy looking at yet another piece of rock. Unfortunately, it's not mine for long, just long enough to get attached and take some pics
Thanks for looking