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Thanks for the link Piet, that's the same stone and I agree with mrmaroon's observations. I'm really intrigued by this and hope to come up with name and origin.

It's harder than a Thuringian, more like the Belgian I have. It doesn't give a slurry while honing yet it's easy to make with a DMT. The pattern sure does look like the Silkstone and it if weren't...

Some pics of it dry and next to a thuringian to show contrast. I also tried to take a clear picture through my 10X loupe. You can see the fairly large red inclusions.

Thanks for the comments everyone. I'm actually happy to hear that it might be something interesting. I did a quick test on a razor and I don't think it's as fine as my thuringian but it does leave a...

Any idea about what this stone might be? It's a blue/gray color with small red dots. The stone on the right I know to be a Belgian Blue since it's a natural combination coticule. The slurry is white...