Widmanstätten patterns, also known as Thomson structures, are figures of long phases of nickel–iron, found in the octahedrite shapes of iron meteorite crystals and some pallasites.
Segment of the Toluca meteorite, about 10 cm wide
Widmanstätten pattern in the Staunton meteorite
The fine Widmanstätten pattern (lamellae width 0.3mm) of a Gibeon meteorite.
Etched slice of a Canyon Diablo meteorite showing a Widmanstätten pattern
The pallasites are a class of stony–iron meteorite. They are relatively rare, and can be distinguished by the presence of large olivine crystal inclusions in the ferro-nickel matrix.
A slice of the Esquel pallasite, clearly showing the large olivine crystals suspended in the metal matrix.
Eagle Station, ES group
Krasnojarsk meteorite
Brenham