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Yeah, it's what the stone does when it's not cutting with freshly exposed grit that counts. Can you clog the surface of it with loose grit, can it be used until the grit on the surface has dulled or...

owyhee jasper slabs. Some japanese finishers.

Hard to get a guess at the size of the actual particles in a stone without generating a slurry using a diamond hone.

I figured the zulu hone that I had was similar to any other hard sedimentary...