I just came across this same stone in the last couple of days when looking at pocket stones, and I found that it is usually referred to as the Fallkniven "CC4", and you might find a little more info searching that way.
From my little bit of looking, I am interested enough to give it a shot as a field stone since its only about $23 (here) at this time.
Im sure the darker side is the same composite as the seen on the DC4, which is an excellent grit that can kind of build a slurry of sorts. Its unique in my experience.
Coupled with the finer ceramic I would imagine it a super useful stone.
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