I have a stone, purchased from E-Bay quite a long time ago, that is marked Green Cambrian on the back side with marker. It’s light green with abundant black spots. A hard stone, it doesn’t slurry without a lot of work and is very thin.
I’ve been trying to research Green Cambrian hones and not coming up with much at all. What I do find, doesn’t look much like my stone. Any thoughts on what this stone could be?

Could not get the 3rd pic to rotate. Last pic is the stone with water on it,

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