These huge gypsum crystals in Mexico's Naica caves, some up to 12m long, have been growing for tens of thousands of years -- but scientists have only now discovered what's inside them. "We've ...
The Cave of Crystals is an underground cavern filled with tree-size gypsum crystals, including some of the largest natural crystals ever found. The cave is located around 980 feet (300 meters) deep ...
Discovered by accident in one of the largest zinc and silver mines in northern Mexico, the Naica cave, filled with enormous selenite gypsum crystals, contains a highly toxic atmosphere. After years of ...
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