Agate Geode look-alikes

Chalcedony (microcrystalline quartz) with quartz crystals

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Several rocks and minerals can be confused with Agate 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

Thunder Egg

Rhyolite nodule with chalcedony and/or opal

Also known as: Lithophysa

Vug

Any rock cavity lined with crystals

Also known as: Crystal-lined cavity

Concretion

Sedimentary rock mass formed by precipitation of mineral cement

Also known as: Nodule

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