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I thought Thuringian stuff had a lighter mudd to it.

Could be granite. I heard from the Sysco sales rep the local quarries used to hit some nice stones
for sharpening from time to time in the Rockland country.

I would say it's natural.

If the stone rusts in a building with a lot of water in the air it is must likely
natural. unless they added something you don't want in the stone.
But the top side has the least damage from being...

I kind of think you found a nice natural fine stone.
even if it's not it must likely would do the job of making your razor shaving sharp.

When I refer to manmade I refer to anything that's manmade.
I have a 12k water stone that is so old it came with a wooden base and I never tried it once with razors.
I only sharpened on it a few...

Yea today I learned one of my stones that I thought was manmade I learned is natural.
I was honing a razor on it and thought it was manmade cause how just how fast it was cutting.
But the more and...