ijolite

== English == === Etymology === Derived 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”). === Noun === ijolite (countable and uncountable, plural ijolites) A rare igneous rock consisting essentially of nepheline and augite. === Further reading === “ijolite”, in Mindat.org – Glossary‎[1], Hudson Institute of Mineralogy, 2000–2026.