When it originally arrived, it was caked with a sticky layer of old oil.
Attachment 247012
Then, as I scrapped off part of that layer, it appeared dark blue glass like. That may have been in part due to the filings of the knife that I was scrapping the stone with.
As I am continuing to clean, it does not now have the same color. More of a brownish black, and, it is not as slick as before, so was probably had been clogged with metal filings that changed the color and slickness. It is a nice, and flat Arkansas, but not quite as fine as the translucent.
Attachment 247011
Sorry for the false alarm. Now, i will be on the lookout for the real thing though.