- Geodes form when magma bubbles trap gas pockets in cooling lava. Groundwater containing dissolved elements seeps into these cavities and slowly evaporates, leaving crystals behind.
- Cavities are formed when organic materials (like tree roots or shells) decompose in limestone or shale, leaving an empty space for mineral-rich water to fill.
- The bumpy, durable exterior is typically composed of chalcedony (wavy quartz), basalt, or limesto.
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Facts about geodes
Cool facts about geodes
May 20, 2026
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