1.65" Etched Seymchan Pallasite Slice (18.1 grams) - Russia

This is a 1.65" wide (18.1 grams) piece of the Seymchan pallasite meteorite from the Magadan district of Russia. It has been nicely cut/etched into a thin slice to display the complex Widmanstätten pattern.

The Seymchan meteorite, based on the first few specimens recovered in 1967, was originally classified as a course octahedrite (IIE) iron. Recently, meteorite hunters using metal detectors have recovered many new masses. Several of these (an estimated 10 to 20% of the masses) contain olivine, revealing the true pallasitic nature of this meteorite, leading to its reclassification.

Pallasite meteorites are a class of stony-iron meteorites. They were once believed to have originated at the core-mantle boundary of asteroids that shattered through impacts, though a recent hypothesis is that they are a mixture of core and mantle minerals.

Pallasite meteorites consist of olivine (peridot) crystals that are surrounded in an iron-nickel matrix. Some pallasites will display interweaving structures known as Widmanstätten patterns or Thomson structures in areas of coarser metal. These structures are comprised of iron-nickel crystals commonly in the form of kamacite and taenite.

Less than 100 pallasite meteorites are known, with only four having been documented as observed during their fall.
Magadan District, Russia
1.65 x 1", .1" thick, Weight: 18.1 grams