Picked up this stone on a trade. Never saw anything like this. Primarily green in color. With black streaks, light greenish patches, and fine gold flecks throughout. Reminds me of wood due to the grain. Was told it hails from France.
Acts much like a Coti (I think). Feels slightly gritty with slurry, and must be finished on clear water as the slurry is rather aggressive. I believe garnets or some kind of material releases from the stone and cuts the blade. Stone is hard, smooth, and due to the grain, seems like it could flake away, like shale. But it hasn’t done that yet.
Anyway, just thought I’d post and see if anyone has seen anything like this. Attachment 299772Attachment 299771Attachment 299773Attachment 299774