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07 Feb 2017
Geode
Thunder eggs, or geodes, are geological rock formations which occur in sedimentary and certain volcanic rocks. They look like regular rocks externally, the outside typically comprised of limestone, however have crystal formations of quartz on the inside. They're known as thunder eggs by treasure hunters simply because they do resemble very large eggs because of their smooth exterior and round shape. If you are thinking about any kind of treasure hunting you may want to start out with these thunder eggs, or geodes.

mindat
The actual worth of the geodes is their appearance when they are halved and polished. Their crystal formations typically come in a multitude of colors, from deep purple to pink, blue, and even a silvery crystal...