Iron-60 is an iron isotope with a half-life of 2.6 million years,[REF][REF] but was thought until 2009 to have a half-life of 1.5 million years.
In phases of the meteorites Semarkona and Chervony Kut a correlation between the concentration of 60Ni, the granddaughter isotope of 60Fe, and the abundance of the stable iron isotopes could be found, which is evidence for the existence of 60Fe at the time of formation of the solar system.