a mineral, iron-nickel phosphide,3P, found only in meteorites.
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Phosphorus in the mineral schreibersite is highly reduced, which means it’s not tightly bound to oxygen in the mineral.
It’s not completely clear there was enough rock exposed to the air—where it could be hit by lightning and lead to schreibersite production—to make phosphorus available.
From there it was just a matter of calculating how much schreibersite could have been produced by lightning billions of years ago, around the time the first life emerged on Earth.
The planet needed a lot of phosphorus-containing schreibersite to sustain life.
One potential source of phosphorus on the early Earth is the unusual mineral schreibersite, which is found in small amounts in meteorites.