Eagle Station pallasite
Eagle Station pallasites are a small pallasite grouplet with more iron-rich olivine and distinctive oxygen isotopes.
Eagle Station pallasites form a small grouplet named after the Eagle Station meteorite, found in Kentucky in 1880. Only a handful of members are known. Like main-group pallasites they contain olivine crystals in iron-nickel metal, but the details differ.
Their olivine is richer in iron, about 17 to 20 per cent fayalite, and contains more calcium. Their metal is richer in nickel and iridium, resembling IIF iron meteorites more than IIIAB. Most strikingly, their oxygen isotopes plot close to those of CV and CO carbonaceous chondrites rather than with the main-group pallasites.
These differences show that pallasites were made on more than one parent body. The Eagle Station grouplet probably comes from a body built of carbonaceous-chondrite-like material that melted, while main-group pallasites come from a different one. Eagle Station pallasites are rare and valuable for research into the diversity of differentiated asteroids.
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