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Almost all natural stones contain some carbonate minerals. These foam. As for synthetics it works only for some with magnesia binder or something similar. Norton won't foam. Naniwa superstones won't...

I've been here for a long time and know the rules, I was sure everybody understood that I was kidding, it's a common thing. I've also done it for la lune stones as well as for filarmonica razors,...

I think this stone is described on this thread, http://straightrazorpalace.com/hones/106607-ordovician-thuringian-hones-ii-escher-quarry.html
The stamp on the other hand, it's clearly Japanese,...