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Agate forms in the nodule cavities of volcanic rock when silica-rich fluids seep through the volcanic material. Similar to geodes, layers of chalcedony and quartz are built up within the cavity over time, different minerals and concentrations determining the color of each layer. Crystals can form within the agate, reaching inwards to the center of the nodule.
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🇺🇸 Ship from USA · On Agora since 2024
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