Geode look-alikes
Silica (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
Nodule
Various compositions (e.g., chert, pyrite, phosphate)
Also known as: Concretion
Vug
Cavity lined with crystals
Also known as: Druse
Septarian Nodule
Calcite/Aragonite/Barite filled mudstone concretion
Also known as: Dragon Egg
Agate
Cryptocrystalline silica (SiO2)
Also known as: Banded Chalcedony
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