Need help to identify a Wetstone, Maybe Belgian Blue?

I have posted two pictures, one dry and the other wet. I lapped the stone and the slurry looked very similar to my Escher stone slurry. The measurements of the stone are 3/4" x 2 7/8" x 17". It has a beautiful grain pattern. I found it in an antique store in Sparta, WI, on the lower self, no box just the stone. Thanks for the help,





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