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Just tried this with white vinegar on one of mine. It did bubble but not very much. I’ve had better luck doing this with something like CLR. One thing to note-unlike Coticules these stones are...

OP here are the stones that I’m referring to. This is what I believe you have. As you can see most of these guys really like them.
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But the most important thing is that you are getting along well with the stone and that’s all that matters.

I will remain in the minority and still say that it’s synthetic. You could always send a few good pics over to Maurice at Ardennes and see what he thinks about it. He’s seen a Coticule or two in...