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You are correct musicman, you could end up with an exploding rock if you boil the rock in a pot of water. What you want to do is what happygirl said, keep pouring boiling water over the rock. You could probably use a diluted bleach solution to kill any bacteria in the crevices. It would be cheaper than peroxide and you may have some already. You can then rinse it thoroughly and then soak it in a bucket with some dechlorinator in it.
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