  On 17 November 1998, a helium-filled weather balloon was launched into the
stratosphere, equipped with a xerogel microparticle collector. The three-hour
flight was designed to sample the dust environment in the stratosphere during
the Leonid meteor shower, and possibly to capture Leonid meteoroids.
Environmental Scanning Electron Microscope analyses of the returned collectors
revealed the capture of a $\sim$30-$\mu$m particle, with a smooth,
multigranular shape, and partially melted, translucent rims; similar to known
Antarctic micrometeorites. Energy-dispersive X-ray Mass Spectroscopy shows
enriched concentrations of the non-volatile elements, Mg, Al, and Fe. The
particle possesses a high magnesium to iron ratio of 2.96, similar to that
observed in 1998 Leonids meteors (Borovicka, {\it et al.} 1999) and sharply
higher than the ratio expected for typical material from the earth's crust. A
statistical nearest-neighbor analysis of the abundance ratios Mg/Si, Al/Si, and
Fe/Si demonstrates that the particle is most similar in composition to cosmic
spherules captured during airplane flights through the stratosphere. The
mineralogical class is consistent with a stony (S) type of silicates, olivine
[(Mg,Fe)$_{2}$SiO$_{4}$] and pyroxene [(Mg,Fe)SiO$_{3}$]--or oxides, herecynite
[(Fe, Mg) Al$_{2}$O$_{4}$]. Attribution to the debris stream of the Leonids'
parent body, comet Tempel-Tuttle, would make it the first such material from
beyond the orbit of Uranus positively identified on Earth.
