  Interplanetary dust particles (IDPs) are an important constituent of the
earth's stratosphere, interstellar and interplanetary medium, cometary comae
and tails, etc. Their physical and optical characteristics are significantly
influenced by the morphology of silicate aggregates which form the core in
IDPs. In this paper we reinterpret scattering data from laboratory analogs of
cosmic silicate aggregates created by Volten et al. \cite{volten2007}, to
extract their morphological features. By evaluating the structure factor, we
find that the aggregates are mass fractals with a mass fractal dimension $d_{m}
\simeq 1.75$. The same fractal dimension also characterizes clusters obtained
from {\it diffusion limited aggregation} (DLA). This suggests that the analogs
are formed by an irreversible aggregation of stochastically-transported
silicate particles

Solar and Stellar Astrophysics