Aubrites are primarily composed of large white crystals of the Fe-poor, Mg-rich orthopyroxene, or enstatite, with minor phases of olivine, nickel-iron metal, and troilite, indicating a magmatic formation under extremely reducing conditions.

The severe brecciation of most aubrites attests to a violent history for their parent body.

Comparisons of aubrite spectra to the spectra of asteroids have revealed striking similarities between the aubrite group and the E-type asteroids of the Nysa family.

A small near-Earth object, 3103 Eger, is also often suggested as the parent body of the aubrites.

The composition is however different when compared to (44) Nysa and (64) Angelina, ruling out a linkage.