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There is no grit level, naturals do not have nice round particles like synthetics do.

Knowing the composition does not provide insight of hardness,speed, refinement. It is well known what makes...

correct, it is a mine and the different seams are named with different names based on properties. There are ten different seams, but what is left of the mine is Mejiro, Tenjio, Botan, Koma.

can...

I agree with all of the above. My experience is that a well used DMT 325 will leave very fine scratches on the hone surface, and the first use of nagura/tomonagura for the slurry the stone will be ...

In general many stones get re stamped for commercial purposes, if the seller is honest then the stone will indeed be as described. Even if a stone as from the mine which stamp it carries, there is...