Pallasite - PMGMagadanskaya District, Siberia, RussiaA dimensionalized slice with cut edges to three sides and a natural edge to the fourth side as well as to one corner. Etched to reveal the Widmanstätten pattern of crystallization and olivine crystals. display the lovely and distinctive Widmanstätten pattern found in Seymchan, also seen are some olivine. Widmanstätten patterns are unique to iron-nickel meteorites and are not found on any rocks on Earth. The parent asteroid must have been relatively small, with a specific pressure and temperature range in the iron core, but also large enough to allow a slow cooling rate in the core of only a few degrees per million years. Widmanstätten patterns are created by the separation of two allows of nickels: kamacite (which is low in nickel) and taenite (with a high nickel content.) The resulting crystalline structure of intersecting bands can be used to identify the meteorite; the smaller bands contain a higher nickel content. Weighing approximately 120 grams and measuring 2 3/4 x 2 1/2 in