Hematite
Hematite is the mineral form of iron oxide (Fe2O3), a common primary ore of iron appearing in steel-gray to black colors with a metallic luster, often sold as tumbled, polished, or crystal specimens in mineral and fossil shops.
Estimated value as of 2026 · Source: Science Museum of Minnesota Store and common retail listings for tumbled/polishe…
Fun Fact
Hematite has been used historically as ochre pigment for cave paintings and fashioned into tools due to its density and hardness.
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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.
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Moon Rock Sample (From Apollo 17 Mission)
Lunar basalt specimen collected during humanity's final Apollo mission in 1972.