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arfvedsonite

American  
[ahr-vid-suh-nahyt] / ˈɑr vɪd səˌnaɪt /

noun

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


Etymology

Origin of arfvedsonite

1830–40; named after J. A. Arfvedson (died 1841), Swedish chemist; -ite 1