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On the outside, agate geodes appear to be nothing but rock, but looking deeper into the interior of a geode will reveal incredible crystal growth and formations. Agate geode crystals are usually composed of quartz or chalcedonic deposits, but various other minerals such as calcite, celestite, and dolomite are also commonly found within different varieties of geodes.
Most geodes develop in small hollow burrows within the earth, often created by animals or depressions left by tree roots. The formation begins from a small piece of limestone or anhydrite, and over time, mineral-rich waters seep into the burrow allowing the minerals to harden around the little rock. Through the repetitive series of hardening deposits from mineral-rich waters that eventually form the crystalline structure and outer crust of the geode.

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