Look at the size of those things…
http://pruned.blogspot.com/2007/03/giant-crystal-caves-of-naica.html
“The largest natural crystals on Earth have been discovered in two caves within a silver and zinc mine near Naica, in Chihuahua, Mexico,” a Discovery News article reprinted here tells us. “Reaching lengths of over 20 feet, the clear, faceted crystals are composed of selenite, a crystalline form of the mineral gypsum.”
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