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Exsolution in Iron Meteorites

Exsolution in Iron Meteorites. Bands of kamacite (Fe-Ni metal low in Ni) formed by exsolution in taenite, Fe-Ni higher in Ni. The two phases have different crystal structures. Kamacite exsolved along octahedral planes in taenite. IVA Iron Meteorite, Gibeon.

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Exsolution in Iron Meteorites

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  1. Exsolution in Iron Meteorites • Bands of kamacite (Fe-Ni metal low in Ni) formed by exsolution in taenite, Fe-Ni higher in Ni. • The two phases have different crystal structures. • Kamacite exsolved along octahedral planes in taenite. IVA Iron Meteorite, Gibeon Photo by Jeffrey Gillis-Davis, U. of Hawaii COSMOCHEMISTRY iLLUSTRATED

  2. Cooling Rates Iron-Nickel Phase Diagram Growth of Kamacite COSMOCHEMISTRY iLLUSTRATED

  3. Cooling Rates Matching the measured profile with calculated profiles indicates that the cooling rate of this sample is 1000 K/My. In total, iron meteorite cooling rates range from about 1 to almost 10,000 K/My COSMOCHEMISTRY iLLUSTRATED

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