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City:
North Hollywood
Most geodes are formed in volcanic rock. Air bubbles inside the lava flow produce hollow spaces. These hollows create cavities inside the lava as it cools. Over the centuries, water seeps through the lava. Minerals that were dissolved in the water deposit tiny crystals inside the hollow spaces. Other geodes are formed in sedimentary rock such as limestone, dolomites or shale. https://michalandcompany.com/geode-rocks-gallery/
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Joined APSense.com
Jul 2019