Definitions for arfvedsonite

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  1. arfvedsonite(Noun)

    A rare sodium amphibole mineral.

  2. Origin: Named for Swedish chemist Johan August Arfwedson (1792-1841)


  1. Arfvedsonite

    Arfvedsonite is a sodium amphibole mineral with composition: [Na][Na2][(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 intrusions and agpaitic pegmatites and granites as the Golden Horn batholith in Okanogan County, Washington. 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.


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