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The gypsum crystals of the "Cueva de los Cristales" in the Naica mine of northern Mexico reach 11 meters in length. The hellish conditions (54°C, 100 percent humidity) will prevent this from becoming a tourist attraction, but they preserve the giant crystals of clear selenite. I bring all this up because the upcoming Geology features this image on its cover, heralding a paper on the origin of the crystals by a Spanish-Mexican research team.

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14y ago

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