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I would HIGHLY recommend to any one that they do not do this! There is no safe way to literally boil rock and should never be risked especially with other ways to achieve the same goal in a responsible manner.You can bake or boil rock you just need to be smart about it. If it’s wet then put cold water in a pot, put the rock in and let sit for 30 mins...then turn the heat up. Any water in the rock will acclimate and won’t “blow up”. If you bake it same story, if wet put it in a cold oven for 30 mins and slowly raise the temp.
People that have problems probably toss a wet rock into boiling water or wet rock in hot oven