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Yep, I rotate 3 of them...:o

Oh, and if you have anything higher than 120 I would use that instead. 120 is a little low imo. And rinse the stone well to get any grit out that may have embedded itself into the stone.

Well, then I think the only thing you can do is try it. But go very lightly at first to make sure no huge particles are tearing your blade up. Do a few passes and look at the edge under a magnifying...

Can you get it to slurry up with another stone? Interested in what it would look like and whether or not it kicks up any sand particles. In which case you will then know what it is...
It looks...