ureilite/ˈjɔːɹiɪlʌɪt/EtymologyFrom Russian урейлит (urejlit), named after the Mordovian village of Novy Urey, where a meteorite of this type fell on 4 September 1886.nounAn achondrite composed mostly of olivine and clinobronzite with some diamond or graphite.“Early inspections of the meteorite revealed it to be a ureilite, an unusual composition that does not match other space rocks known to have come from the moon or Mars.”