1. Iron Meteorite Cooling Rates COSMOCHEMISTRY iLLUSTRATED 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

2. Iron Meteorite Cooling Rates COSMOCHEMISTRY iLLUSTRATED Cooling Rates Iron-Nickel Phase DiagramGrowth of Kamacite

3. Iron Meteorite Cooling Rates COSMOCHEMISTRY iLLUSTRATED 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