I don't know the name, Sham, but I believe it's volcanic in origin rather than sedimentary or metamorphic. I have what I think is the same stone; I got it in a small lot of razor related things. I've lapped mine and have tried it briefly as a razor hone. I've found mine to be worthless as such. Too gritty and relatively speaking, soft. It's a coarse stone to be sure.


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Chris L