  Spitzer photometry and spectroscopy of the star HD69830 reveal an excess of
emission relative to the stellar photosphere between 8 and 35 $\mu$m dominated
by strong features attributable to crystalline silicates with an emitting
surface area more than 1,000 times that of our zodiacal cloud. The spectrum
closely resembles that of the comet C/1995 O1 (Hale-Bopp). Since no excess is
detected at 70 $\mu$m, the emitting material must be quite warm, be confined
within a few AU of the star, and originate in grains with low long-wavelength
emissivity, i.e. grains much smaller than $70 \mu$m$/2\pi\sim 10 $ $\mu$m. The
strong mineralogical features are evidence for even smaller, possibly
sub-micron sized grains. This small grain size is in direct contrast to the
10-100 $\mu$m grains that dominate the relatively featureless spectra of our
zodiacal dust cloud and most other main sequence stars with excesses. The upper
limit at 70 $\mu$m also implies that any Kuiper Belt analog must either be very
cold or be less massive than $\sim$ 5 times our own Kuiper Belt.
  With collisional and Poynting-Robertson drag times of about a thousand years
for small grains, the emitting material must either: a) be created through
continual grinding down of material in a dense asteroid belt; or b) originate
in cometary debris arising from either a single ``super-comet'' or a very large
number of individual comets arriving from a distant reservoir. In the case of a
cometary origin for the emission, the mass requirements for continuous
generation by many individual comets are unreasonable and we favor the capture
of a single ``super comet'' into a 0.5-1 AU orbit where it can evolve a large
number of small grains over a 2 Myr period.
