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Good luck with that...

“What am I feeling is something as smooth as glass, and I can see my re flexion in the stone.”

So are you saying you can hone on glass? They feel the same…

Of course not, and that is the point,...

So, what is it that you are feeling? And really, you can tell grit size with your fingers, down to 50K, a quarter of a micron?

On some stones you can grit rate/compare, a particular stone face....

“Why can't someone determent the grit of a natural stone or guess at it ? Who determent the grit of a man made stone ?”

The size of the grit used to make it.

Natural stones are made by nature,...