The world’s 2500 rarest minerals have now been categorised for the first time, revealing intriguing implications. Most have been formed in processes directly or indirectly related to living organisms, and so they may serve as a signature of life on other planets, the authors suggest.

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The world’s 2500 rarest minerals have now been categorised for the first time, revealing intriguing implications. Most have been formed in processes directly or indirectly related to living organisms, and so they may serve as a signature of life on other planets, the authors suggest.