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Occasionally, very large nickel/iron meteorites strike the Earth, and on examination it is apparent that they were once part of a much larger body which had differentiated into a metallic core and stony mantle before being disrupted by impact. Can these meteorites, by analogy, tell us anything about the more subtle contents of the Earth's core, apart from the basic fact that it is largely nickel/iron? Could they, for example, confirm the hypothesis that iron sulphide is an important minor constituent (5%) of the Earth's core?

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    $\begingroup$ If these meteorites come from another differentiated body, I don't think they can be used as a proxy to the composition of the Earth's core: during planetary differentiation, the partitioning of elements between metal and silicate phases depends on many parameters such as pressure, temperature, oxygen fugacity... Conditions that could have been different on this other body. $\endgroup$ – Jean-Marie Prival Dec 2 at 13:42

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