Geode look-alikes
Geode (Chalcedony/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
Thunderegg
Thunderegg (SiO2)
Also known as: Lithophysa
Concretion
Variable (e.g., Calcite, Siderite, Pyrite)
Also known as: Nodule
Vug
N/A (geological feature, not a rock/mineral)
Also known as: Cavity
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