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Old 03-21-2007, 12:19 PM   #11
Dypok
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Join Date: Jun 2005
Posts: 27
http://www.findarticles.com/p/articl...57/ai_66681236

Found a better explanation of gypsum crystal formation for a similar site in Spain.

Geologists think the gigantic geode was formed 6 million years ago, when mineral-saturated water flowed through a rock hole. As water slowly evaporated, minerals clung to the rock's surface, forming a lattice of smooth-faced, geometrical shapes. "When minerals separate from water they stick to solids, just like sugar from a solution sticks to a piece of string," says Paul Burger, a geologist at New Mexico's Carlsbad Caverns. "Crystal formation uses the same process that makes rock candy."

I'm not sure if the subject pictures qualify as a geode, but the mineral deposit and crystallization process would be the same.
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