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Australian Museum
Australian Museum: Concretions, Thunder Eggs and Geodes
Ever break open a geode and see the beauty inside? Learn how those crystals formed, as well as the mineral formations in thunder eggs and concretions.
Curated OER
National Park Service: Agate Fossil Beds: Geologic Formations
This National Park Service site has information about these fossil beds in Nebraska and where the name Agate came from.
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