  We present visible and near-infrared reflectance spectra and interpreted
surface mineralogy for asteroid 10537 (1991 RY16). The spectrum of this object
is without precedent amongst the Main Belt asteroids. A unique absorption band
centered at 0.63 microns could be attributed to one of several mineralogies.
Pronounced 1- and 2-micron absorption bands suggest that the composition of
10537 is a mixture of pyroxenes and olivine and that it originated from a
parent body that was partially or fully differentiated. The closest available
analog is the large Main Belt asteroid 349 Dembowska but 10537 may be an
isolated fragment from a completely eroded parent body.
