Amanda Heidt is a Utah-based freelance journalist and editor with an omnivorous appetite for anything science, from ecology and biotech to health and history. Her work has appeared in Nature, Science and National Geographic, among other publications, and she was previously an associate editor at The Scientist.
In Virgin Valley, Nevada, it's possible to spend an afternoon digging for rare black fire opals, while visitors to Coalinga, California, can scour the dirt for pieces of the state's official gemstone, benitoite. At Arkansas' Crater of Diamonds State Park, aspiring gemhounds pay just $10 to hunt for the world's most sought-after stones.
"It'd been hard to tell whether diamonds or peridot were the deepest, but that pretty much settled the debate," Groat said. Gemologists didn't need to burrow into the Earth to learn this; the deepest we've ever penetrated into the planet's interior, at the Kola Superdeep Borehole in Russia, barely scratched the surface, at just 7.8 miles deep.
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