Geode look-alikes
Silica (Chalcedony/Quartz) lined nodule
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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, pyrite, phosphate)
Also known as: Concretion
Vug
Crystal-lined cavity (not necessarily a distinct nodule)
Also known as: Druse
Thunder Egg
Rhyolitic spherulite with a chalcedony/agate core
Also known as: Lithophysa
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