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There are no natural coarse-medium grit stones that are fast, or come close to what we define as fast. Man made stones are made to be fast, with harder abrasives, and binders with specific...

Yes, it's a great stone, if a bit slow. Hard, porous, with nice scratch pattern. I like it.

I looked about this stone, it has history as a sharpening stone-hone, so I suppose, it has to be consistent. Not every natural stone is unreliable. Some of them are really good, finishers or coarser...

All natural stones are very slow, and we use them as finishers because their edges feel better than most synthetics. I really like naturals, but for stones 3k and up, for lower grits, all I need is...