Hefty Campo del Cielo iron meteorite, showing faint surface indentations (regmaglypts) caused by the surface melting during flight. The whole specimen weighs 4.8 kilograms and measures approximately 137 mm x 112 mm x 79 mm. Campo del Cielo is a class IAB iron meteorite, comprised of about 93% iron and 7% nickel plus trace elements. It was first discovered in 1576 by Spanish explorers under Captain de Miraval in Chaco Province, Argentina, and is, therefore, one of Earth's oldest-known meteorites. The impact is believed to have occurred approximately 5,600 years ago and the Campo strewnfield is one of the larger known at roughly 18 km in length, which includes about 25 craters. It is also one of the largest impacts from which actual meteorite specimens have been recovered. The largest single mass from the fall, known as 'El Chaco,' weighs 37 tons and is regarded as a national treasure in Argentina. Accompanied by a certificate of authenticity signed by Geoff Notkin of Aerolite Meteorites Inc. and the TV show Meteorite Men, as well as a specimen identification card.
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