How are geodes formed?



  1. 0 Votes

    Geodes, or rock cavities, form in gas bubbles in igneous rocks and rounded cavities in sedimentary rocks. When the rock around the cavity hardens, dissolved silicates and carbonates are deposited on the inside surface; chemical weathering allows crystals to form on the inside of the cavities. Bedrock eventually weathers away, revealing beautiful, once hidden geodes.

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