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Here is the rest of the lapping story. While tired and still making a mess on the back porch, I thought, "well, I might as well try the 400 diamond plate and see what happens." I had previously...

Back home and getting to work on this hone. Set out to get the thing flat beginning with least aggressive methods; here is how that is going to far:

Started with 400 w/d sandpaper on a little...

Few pics this morning, I do have a Llyn Idwal, and this stone doesn't seem to chip in the same flakey way.
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Thanks for adding more thoughts on this stone. It smells of oil, but not thick at all. Both sides are pictured above, there are some differences noticeable in the inclusions, but the light ridges...

Was able to sneak away for a few minutes to take pics, could this be a synthetic Stone? Not much of s muddy smell, and very green fine slurry after some hard rubbing.
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With family a day, will follow up this evening w more info

Just picked this up from a bin in which my father had several Arkansas stones (mostly smaller stones and sharpening kits). I'm visiting family and don't have time for proper research, but interested...