Believed to have fallen some 80 000 years ago, this 60-ton iron-nickel meteorite
measures 3 m x 3 m x 1 m.
Upon receiving the meteorite, Sirbescu evaluated it and discovered it was an iron-nickel meteorite
, composed of 8 to 8.5 percent iron and 11.5 percent nickel.
It came to be known as "Egg Rock" and was later confirmed to be an iron-nickel meteorite
6 a class of space rocks commonly found on Earth.
Earlier research had ruled out the Anoka, an iron-nickel meteorite
found in 1961 during the digging of a cesspool near Anoka, Minnesota.
Analysis with the ChemCam spectrometer confirms that it's an iron-nickel meteorite
, whose outer surface melted and vaporized during the meteorite's plunge through Mars's tenuous atmosphere.
Opportunity found a smaller iron-nickel meteorite
, called "Heat Shield Rock," in late 2004.
Scientists believe the 55,000 year-old Meteor Crater was created by a 50-meter wide iron-nickel meteorite
traveling at 40,000 miles per hour.