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It has just occurred to me - Maciek, you should ask your friend where he procured the stone. Maybe it is neither LI or Frankonian. Perhaps there's a quarry in Poland that we don't know of?

My LI is actually very fast on slurry from a very worn 1200 Atoma - just slightly faster than my Frankonian on the same slurry. I haven't tested on plain water or oil yet. The OP's stone looks...