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looks like a Turkish oilstone.

Turkish oilstones are strange hones. Lapping a stone that is wet is impossible. It will easily destroy a diamond plate or many pieces of sandpaper, pretty much like a translucent Arkansas. But if its...

Any photos of the stone dry? I don't think its a Turkish oilstone. For this much slurry, even with a diamond plate, it needs a few days of lapping. But it does look like one.