arfvedsonite

[ ahr-vid-suh-nahyt ]

/ ˈɑr vɪd səˌnaɪt /

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noun Mineralogy.

a sodium-rich amphibole, occurring in green to black crystals in alkalic rocks.

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Origin of arfvedsonite

1830–40; named after J. A. Arfvedson (died 1841), Swedish chemist; see -ite¹

In Greenland there are leucite-tinguaites with much arfvedsonite (hornblende) and eudyalite.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5|Various