Arfvedsonite

 ( Amphibole Group ) 

Arfvedsonite (

) or soda hornblende (partiellement obsolète) is a sodium amphibole mineral with composition: NaNa₂(Fe²⁺)₄Fe³⁺(OH)₂|Si₈O₂₂. It crystallizes in the monoclinic prismatic crystal system and typically occurs as greenish black to bluish grey fibrous to radiating or stellate prisms.

It is a rather rare mineral occurring in nepheline syenite and agpaitic (peralkaline) and as the Golden Horn batholith in Okanogan County, Washington (type locality for zektzerite). Occurrences include Mont Saint-Hilaire, Quebec, Canada; the Ilímaussaq complex in Southern Greenland; and in pegmatites of the Kola Peninsula, Russia. Its mineral association includes nepheline, albite, aegirine, riebeckite, katophorite and quartz.

Arfvedsonite was discovered in 1823 and named for the Swedish chemist Johan August Arfwedson (1792–1841).

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See also

• List of minerals
• List of minerals named after people

• Deer, W.A., R.A. Howie, and J. Zussman (1963) Rock-forming Minerals, v. 2, Chain Silicates, p. 364–374
• Mineral Galleries

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