The giant gypsum crystals in Naica, Mexico’s Cave of Crystals owe their size to unique conditions. The cave was undisturbed and had a constant temperature of 58C (136F) resulting from the proximity to a fault line. Source material to supply the crystal growth, as well as the temperature, was provided by mineral-rich groundwater warmed up by an underground magma chamber. With these conditions stable for half a million years, you end up with huge crystals.
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