Allende meteorite
The availability of large quantities of samples of the scientifically-important chondrite class has enabled numerous investigations by many scientists; it is often described as "the best-studied meteorite in history . " The Allende meteorite has abundant , large calcium-aluminium-rich inclusions ( CAI ) , which are among the oldest objects formed in the Solar System . 
<triplet> Allende meteorite <subj> meteorite <obj> instance of