Relict Grain

Coarse-grained precursor material typically found in chondrules, that survived the melting event that formed the host chondrule. In other words, the relict grain did not crystallize in situ from the host melt. In fact, relict grains can be survivors from previous chondrule-forming events that have been recycled into the most recent melting event. The detection of relict grains and the determination of their frequency in chondrites provides important insights into the nature of chondrule precursors, their gaseous environment, and their mode of formation.1

In rare cases, relict grains may also be present in CAIs2, and therefore, the same statements above may be applied to CAIs and CAI-forming events.