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Be very careful about boiling rocks. The geologist from our board has seen/heard of cases of rocks exploding when they're boiled if there are air pockets in them.
If you're going to boil them, it's recommended to do it outside, whether it be on your BBQ grill or some other method.

A safer way is to soak/scrub them in a mild bleach solution, rinse them in dechlorinated water, then rinse well in plain water.

Here's a helpful article by the above named geologist about rocks in the aquarium.
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