ijoliteijolite means A rare igneous rock consisting essentially of nepheline and augite.EtymologyDerived from the first syllable of the Finnish words Ii-vaara, Iijoki, etc., common as geographical names in Finland (ultimately reflecting Proto-Samic *ijë (“night”)), and Ancient Greek λίθος (líthos, “a stone”).nounA rare igneous rock consisting essentially of nepheline and augite.