Nickel-Iron, Coarse OctahedriteGran Chaco, ArgentinaThe famous iron-nickel meteorite, Campo del Cielo, fell to Earth over 4,000 years ago in a mountainous region of Gran Chaco, Argentina, 500 miles north-northwest of Buenos Aires, in one of the largest and undoubtedly most dramatic falls of the last 10,000 years. Meteorites from this fall were scattered over hundreds of square miles of inaccessible terrain. The two polished and etched sides of the present specimen display the coarse octahedrite Widmanstätten pattern which results from two alloys of nickel - kamacite (the light bands which are low in nickel) and taenite (the dark bands which are high in nickel.) The rear sides exhibit the original surface of the meteorite with several distinctive regmaglypts. Weighing approximately 1814.0 grams (4 lbs). Larger etched side measuring 5 ¼ x 3 in and smaller etched side measuring 2 ½ x 2 in