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I doubt the stone is ruined even if it smells objectionable. Unless it’s not cutting correctly it’s probably fine. But it’s probably mold you’re looking at. Don’t try to kill it with anything. You’d...

I don’t know for sure but get them out of that box. It’s only natural that a porous surface is retaining moisture and is being trapped in the box. I actually store mine with silica gel to avoid this.