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Chris, Kees told me about his stone and that it was marketed by an American company. Mine was marketed under the Droescher name so Hohenzollern is probably a type of stone. It looks like a Y/G Escher...

I just boubht this small Hohenzollern hone and took some pictures with my ProScope HR digital microscope. I don't know much about this hone except that Kees says that it is finer than than a...