Iron Meteorites and Pallasites
Experts disagree on whether iron meteorites have fusion crusts. In my opinion, they do not, but they do have a patina.
Sikhote-Alin (IIAB iron, 23 tons, but there are thousands of pieces) is a good example of an iron meteorite with a patina. It fell in Russia in 1947, so it is not weathered. Photo credit: Randy Korotev
Small fragments of Sikhote-Alin shrapnel. Sikhote Alin is probably the most-photographed meteorite; there are thousands of pieces. Photo credit: Randy Korotev
The Bur-Abor (IIIAB iron, 290 kg) iron meteorite from Kenya also has a nice patina. Photo credit: unknown
These two (of many!) Campo del Cielo ( IAB-MG, iron 50 tons) stones have shiny patinas. Photo credits: Randy Korotev.
The Sterley (pallasite, 1.725 kg). Like many other iron and pallasite meteorites, it was found by a farmer plowing a field, so it has a weathered exterior and no obvious fusion crust. The cube is 1 cm in dimensions. Photo credit: Laurence Garvie
Conception Junction (pallasite, 17 kg) was also found in a farm field. The exterior is highly weathered, but the sawn area shows bright metal with embedded grains of olivine. Photo credit: Randy Korotev