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Mantle

Part of Hall of Meteorites.

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Where are the “missing” olivine meteorites?

Why have no meteorites been found from an asteroid's olivine mantle? Here are a few theories:

Theory 1

No pieces of an asteroid mantle happened to land on Earth. But considering that thousands of meteorites provide numerous samples of crusts and cores, it is hard to explain why not one single piece of mantle would have reached us.

Theory 2

After pieces of the crust were knocked off, the olivine mantles eroded away, pounded into dust by numerous collisions over billions of years. But other meteorites made of material just as fragile as olivine have managed to reach Earth.

Theory 3

A thick layer of olivine simply does not e