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Pallasites are believed to form between the silicate mantle, or outer shell, and molten metal core of a differentiated asteroid. The primary silicate mineral in pallasites is olivine, distinguishable by its greenish hue. 

The olivine crystals contained in the Marjalahti pallasite are of such consistently high purity that they were adopted as a scientific standard for the composition of olivine (aka the gemstone peridot).

Gem-quality peridot has been identified in multiple pallasite meteorites.