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looking at that I would say there is something toxic in the stone, perhaps it's a stray garnet, but I would think to cause damage like that it would have to be something more inclusive.

Have a...

no it's not big garnets. Its binder hardness variations. The garnets are microscopic, You can't see them in the slurry but you can feel them on your teeth... don't ask.

What you are seeing is the...

I've got one of the harder ones and I've been playing a lot with it.

I found lapping it to 1K helped with the rough feeling. Then burnishing it smooth also helped. The original finish from AC...