![75-year-old handwritten letter led researchers to one of the 'rarest minerals on Earth'](https://cdn.statically.io/img/ic-cdn.flipboard.com/d1uky1dtpry8e9.cloudfront.net/ebfe17d60b5534354ce91ce337e00127fc6d1b6e/_xlarge.jpeg)
75-year-old handwritten letter led researchers to one of the 'rarest minerals on Earth'
Although the rare mineral's identity has been confirmed, its formation history will always remain a mystery.
Louise Sharman flipped this story into Archaeology/Paleo n Evol.•13d
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