The diagram shows different veins and dots. Look in the photos there and you will see the difference.
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Im thinking slate, like the link posted thats my stone, more importantly what color is the slurry?
Yes, I am happy with my quality of shaves with the same set of hones; I just like finding and playing with the stones too.
It looks like the fabled green-striped Bitza to me - similar to the blue striped Hodgepodge, but totally different. :)