Volcano Agate Sphere A

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Volcano agate forms when lava from a volcanic eruption cools and creates cavities within the rock due to trapped gas bubbles. Groundwater rich in dissolved silica then percolates t hrough these cavities, gradually depositing layers of silica that crystallize into agate over time, resulting in the distinctive banding patterns often seen in this gemstone. Weight: 8.3 oz Size: appx 56 mm Show more