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Thuringians being a natural stone have a myriad of colors, take a look at the photo in this thread:
http://straightrazorpalace.com/hones/85090-what-kind-stone-2.html

There is a collage of photos...

It could be a thuringian...let's see some close up photos of the surface both wet and dry, also with slurry. Does it leave a white mark if you scratch the stone with a metal object? It definitely...