Geode look-alikes
Chalcedony with Quartz crystals
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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
Cavity in rock, often lined with crystals
Also known as: Druse
Thunder Egg
Spherulitic rhyolite with a chalcedony/agate and crystal-lined interior
Also known as: Lithophysa
Septarian Nodule
Concretion with internal cracks (septaria) filled with calcite, aragonite, or barite
Also known as: Dragon Stone
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