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YouTubeTED-Ed
The most colorful gemstones on Earth - Jeff Dekofsky
What gives opals their signature shimmering colors? Dig into the science of the gemstone’s formation, millions of years in the making. -- In November 1986, Australian miners climbed Lunatic Hill and bored 20 meters into the Earth. They were rewarded with a fist-sized, record breaking gemstone, which they named the Hailey’s Comet opal ...
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