years BC. The age is estimated to be 4.5 billion years old, formed as part of the development of our solar system.The fragments contain an unusually high density of inclusions for an iron meteorite, which may have contributed to the disintegration of the original meteorite. The average composition of the Campo del Cielo meteorites is 3.6 ppm iridium, 87 ppm gallium, 407 ppm germanium, 0.25% phosphorus, 0.43% cobalt, and 6.67% nickel, with the remaining 92.6% being iron. See also Glossary of meteoritics List of impact craters in South America Río Cuarto craters List of largest meteorites on Earth References External links campodelcielo.info Meteorites found in Argentina Impact craters of Argentina Holocene impact craters Quaternary Argentina Chaco Province Santiago del Estero Province