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Exoplanets: Life Forms Made One Third of Earth’s Minerals

Researchers hope detection of such minerals on exoplanets can narrow the search for life

Recent work on how minerals form may help determine which planets are more likely to be habitable or inhabited. One-third of minerals — chemical solids whose atoms are highly ordered — are created directly or indirectly by life forms, says Carnegie geologist Robert Hazen: “One third of Earth’s minerals could not have formed without biology — shells and bones and teeth, or microbes, for example, or the vital indirect role of biology, such as by creating an oxygen-rich atmosphere that led to 2,000 minerals that wouldn’t have formed otherwise.” Carnegie Institution for Science, “Crushed, zapped, boiled, baked and more: Nature used 57 recipes to create Earth’s 10,500-plus ‘mineral kinds’” at ScienceDaily Both papers, here and here, require a fee or…