Treasure Hunting For Geodes - By: David Cowley, 2008-06-18

Thunder eggs, or geodes, are geological rock formations which occur in sedimentary and certain volcanic rocks. They look like regular rocks from the outside, the exterior typically made up of limestone, but then have crystal formations of quartz on the inside. They're referred to as thunder eggs by treasure hunters because they resemble very large eggs with their smooth exterior and round shape.

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