I really don't have a clue where to start with this one. It looks like a variation of every stone I have ever seen (with this color).
White balance is a bit off, it is a little more grey than shown but still green/yellow.
It is a nice smooth silky and easy honer that will get you to at least 8k, probably more, I haven't done a lot with this one as I have so many more to get through. Need to try to ID it so I can say with some asurity it is what I describe. Sorta' feels like a thuri, as most other similar stones will.
Easy to lap, easy to slurry (creamy white) and medium speed for a softer stone. Doesn't look any different wet so I didn't include a pic.
Sorry I forgot the ruler.
It is 7 1/8"x1 1/2"x3/4" inches. Both surfaces lapped.
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Any help would be greatly appreciated.