Geode look-alikes
Quartz Geode (Chalcedony and Crystalline Quartz)
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Open the appSeveral rocks and minerals can be confused with Geode. Below are documented look-alikes and the features that tell them apart. Never rely on a single feature. Always check multiple properties.
Similar rocks to compare
Nodule
Various compositions (e.g., chert nodule, pyrite nodule)
Also known as: Concretion
Vug
Geological term for a small, unfilled cavity in a rock
Also known as: Cavity
Thunder Egg
Spherulitic rhyolite with a chalcedony/agate core
Also known as: Lithophysa
Septarian Nodule
Calcite-filled mudstone concretion with radiating cracks
Also known as: Dragon Stone
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