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Take pics of the label for reference of course...

Please post pics of the "crack". My thoughts are that if the stone is in danger it might be best to epoxy it to a nice piece of hardwood. I would hate for you to sit it down wrong on the countertop...

Interesting, how many other synthetics have you learned?

At the OP, the thuringian waterstone with the label Escher isn't "magic". They are however good finishers, I don't think I have ever...