Definitions

from The Century Dictionary.

  • noun A phanerocrystalline igneous rock composed of nephelite and pyroxene with small amounts of apatite, titanite, and ivaarite. It corresponds in composition to nephelinite, and occurs in dikes associated with nephelite-syenite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A rare igneous rock consisting essentially of nepheline and augite.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Derived from the first syllable of the Finnish words Ii-vaara, Iijoki, etc., common as geographical names in Finland, and Ancient Greek λίθος (lithos, "a stone").

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