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this is interesting stones which i have are a lot softer .I even didn't spend 5 minutes to lap?

Stefan
if you have finest one i would say it is very close to escher with a lot more cutting power.
I had tested couple different ones and choose 2 which is one huge size and next one is normal...

As my early post i mention i will try to buy one and let you know what i think about them.
As all natural stones not all of them is as fine as we like.
Some of them i don't think you could call...

i bought one of those too.
I hope it will act same as your describe Rich(i hope i didn't mess up name). if not i am sending it to you and you got to cover the damage.
have fun.