Iron Meteorites and Pallasites
Experts disagree on whether metal-rich meteorites like irons
and pallasites have a fusion crust. In my opinion, they do not, but
they do have a "patina."
Sikhote-Alin (IIAB) is a good example
of an iron meteorite with a patina. It fell in 1947, so it is not weathered.
Photo by Randy Korotev.
(IIIAB) iron meteorite from Kenya also has a nice patina.
(Texas) pallasite (PMG). 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 by
Junction (Missouri) pallasite (PMG-an) was also found in a farm
field. The exterior is highly weathered, but the sawn area shows bright
metal with imbedded grains of olivine. Photo by Randy Korotev.