Issue Date: September 19, 2011
Giant Crystals Grow Superslowly
Scientists studying the geochemical processes at play in the formation of giant gypsum crystals (CaSO4•2H2O) found in Mexico’s Naica ore mines have determined that these natural wonders—up to about 35 feet long and 3 feet thick—grow much more slowly than a snail’s pace, taking up to 1 million years to reach their current size. To study the crystals, a team led by Juan Manuel García-Ruíz of the University of Granada, in . . .
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