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I have a stone that I found when I was still quite new to wet shaving. It looked like a thurinigian, slurried like a thuringian, soft like a thuringian but when I used it after an 8k I could not...

I'd say Thuri. Your pic of the slurry sure says Thuri. Take a blade to an 8k level, then go to this one and see if it improves the edge. Try and use a blade that you know will take a good edge.

You won't want that one for razors. Looks like a Portuguese paver stone. I'm short one brick in my back yard, do you mind sending that to me so I can complete my project???