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The crystals probably grew relatively quickly to their immense size within a completely liquid-filled cavern.
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This made me think of an elementary school project my class did in the '70s, where you put minerals or chemicals in an aluminum pie plate with ammonia, and the next day the plate was filled with a bizarre sort of 'rock garden.' Anyone else do that?
They probably don't do that in school anymore--I bet there were a few kids who decided to taste it.