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That makes sense. For some reason the I thought a harder stone would be faster cutter. Now that I think about it hard Arks don't cut like soft arks do with pocket knives. Now it seems like a goofy...

I haven't thought much about the amount of variance in Coti hardness. I guess it the same with most species of stone.
Do harder cotis usually cut faster or do they just normally provide a finer edge?