  We have used the Hubble Space Telescope's Advanced Camera for Surveys (ACS)
to detect and measure ~5300 stars in a single intracluster field in the Virgo
Cluster. By performing F606W and F814W photometry on these stars, we have
determined their metallicity distribution function, and constrained the types
of stars present in this portion of Virgo's intracluster space. Based on the
small number of stars detected brighter than the red giant branch (RGB) tip, we
suggest that in this region, Virgo's intracluster stars are mostly old (>~10
Gyr). Through analysis of the RGB stars themselves, we determine that the
population contains the full range of metallicities probed (-2.3<[M/H]<0.0). We
also present evidence that the younger (<10 Gyr) component of the population is
more metal-rich, with [M/H]>-0.5. The spatial distribution of the most
metal-poor stars in the field shows significantly more structure than that of
the metal-rich stars, indicating that the intracluster population is not
well-mixed. We discuss the implications these observations have for the
production of intracluster stars and the dynamical evolution of the Virgo
Cluster.
