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I would just clean it as you normally would, though I have only had rock with speckles or streaks of rust. After I have cleaned questionable rocks I like to soak them in something for a bit to see if they flake apart, discolor the water, or catch on fire. While I haven't had any start burning on me yet several have left litttle rings of rust where they were sitting but it wasn't enough to make me worry about the water being discolored.
 
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