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The formation of planetesimals in the early Solar System is hardlyunderstood, and in particular the growth of dust aggregates above millimetersizes has recently turned out to be a difficult task in our understanding [Zsomet al. 2010, A&A, 513, A57]. Laboratory experiments have shown that dustaggregates of these sizes stick to one another only at unreasonably lowvelocities. However, in the protoplanetary disk, millimeter-sized particles areknown to have been ubiquitous. One can find relics of them in the form of solidchondrules as the main constituent of chondrites. Most of these chondrules werefound to feature a fine-grained rim, which is hypothesized to have formed fromaccreting dust grains in the solar nebula. To study the influence of thesedust-coated chondrules on the formation of chondrites and possiblyplanetesimals, we conducted collision experiments between millimeter-sized,dust-coated chondrule analogs at velocities of a few cm/s. For 2 and 3 mmdiameter chondrule analogs covered by dusty rims of a volume filling factor of0.18 and 0.35-0.58, we found sticking velocities of a few cm/s. This velocityis higher than the sticking velocity of dust aggregates of the same size. Wetherefore conclude that chondrules may be an important step towards a deeperunderstanding of the collisional growth of larger bodies. Moreover, we analyzedthe collision behavior in an ensemble of dust aggregates and non-coatedchondrule analogs. While neither the dust aggregates nor the solid chondruleanalogs show sticking in collisions among their species, we found an enhancedsicking efficiency in collisions between the two constituents, which leads usto the conjecture that chondrules might act as "catalyzers" for the growth oflarger bodies in the young Solar System.

\'Free Collisions in a Microgravity Many-Particle Experiment. II. The Collision Dynamics of Dust-Coated Chondrules