Miners opened a cave filled with 11-meter crystals. π . . . The chamber was discovered in 2000 beneath Mexicoβs Naica Mine. Its selenite crystals grew inside mineral-rich water, while conditions reached about 58Β°C and nearly 100% humidity. It resembled another planet, but the heat made an unprotected visit potentially fatal.
Source
National Geographic, 2007, 'Giant Crystal Cave Comes to Light'
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