Thread: A little help needed: hone identification

Hi folks, I picked up this hone a week ago for a couple bucks at a flea market. It was in with rusty tools and such, very dirty. I figured it for a slate of some sort and just got around to cleaning and lapping it today. There's still some scratch marks from lapping and I might need to do more, but it was hard lapping.

Now I don't know what to think because it seems pretty hard for a slate, it's a deep purple color, the slurry was purple, and it has these blue/green spots in places (which I didn't see when I bought it). It feels very fine, measures about 8 1/4 x 1 7/8 x 1/2. Anybody wanna take a stab at identifying it? Thanks