Geode
A geode is a hollow rock lined with crystals, often quartz, amethyst, or celestine, commonly sold as decorative mineral specimens in the fossils and minerals category.
Estimated value as of 2026 · Source: Fossilicious and general range from multiple sources
Fun Fact
Small quartz geodes from Morocco, about 1-4 inches, are the most affordable and popular for beginners, often sold in sets for breaking open as a fun activity.
Price History
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Californium-252 (per gram)
Californium-252 is a synthetic radioactive element produced in nuclear reactors, valued as an exceptional neutron source for medical and industrial applications.
Dog Collar
A dog collar is a band worn around a dog's neck, typically made of nylon or leather, used for identification, control, and attaching leashes.
Fossil Tyrannosaurus Rex Skeleton (Stan)
Nearly complete T-Rex skeleton auctioned for research and display.
Moon Rock Sample (From Apollo 17 Mission)
Lunar basalt specimen collected during humanity's final Apollo mission in 1972.