These Fossils Preserved in Opal Are a Gorgeous, Iridescent Window Into the Past. Scientists Are Fighting to Save Them from the Black Market

Cloaked in white dust and surrounded by expansive plains, the town of Lightning Ridge produces the bulk of the world’s precious black opal. This rare gemstone, prized for its dazzling play of color, hides out of sight in the Australian outback beneath a town roughly 450 miles northwest of Sydney. And for more than 100 years, people have come to the Ridge to find their fortune chasing prec…

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