Presolar chromite in Orgueil
Nittler L. R., Alexander C. M. O'D., Stadermann F.
J., and Zinner E. K. (2005) Meteorit. Planet. Sci.
We have previously reported the discovery of presolar
Cr-rich oxide (MgAlCrO4) grains in the Orgueil
meteorite. Continued searches of our Orgueil residue have
revealed several iron chromite grains with unusual O
isotopic compositions, indicating that they are preserved
stardust. These results indicate that chromite condenses
around some O-rich stars, contrary to predictions of
equilibrium condensation calculations.