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San Francisco, 6:17 PM
Wed Dec 30
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Giant Crystals Create an Alien Landscape
This photo looks like it could have been taken on another planet - miners harvesting dilithium, perhaps. But this cave full of monstrous crystals is located in Mexico, and the crystals themselves are a form of gypsum, one of the most common elements on Earth. What geologic processes caused the crystals to get so freaking big? More »