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The Aoto has natural abrasives too, this is a very popular stone for knife sharpening because the composition. Imanishi uses natural stone material in their Takenoko 6k or the identical Arashyama 8k...

thanks for the clarification, I was under the impression it was similar to the Imanishi Aoto, but never really checked into it.

I think the stone has natural abrasives which break down and thus provide much better polish than the stated grit of the stone.

those are very popular for knives, very soft stones.