Basic Information-Location: Campo del Cielo, Gran Chaco Gualamba, Argentina, about 500 miles north-northwest of Buenos Aries. Latitude 27 degrees 39 minutes South, Longitude 61 degrees 44 minutes West. ? Structural Class: Coarse octahedrite, Og, Widmanstatten bandwidth 3.0 ?0.6 mm. ? Chemical Class: Group I, 6.68% Ni, 0.43% Co, 0.25% P, 87 ppm Ga, 407 ppm Ge, 3.6 ppm Ir. ? Time of Fall: 4,000 to 6,000 years ago