08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco
08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco 08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco 08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco 08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco 08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco 08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco 08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco 08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco

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08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco

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Species
Arfvedsonite
Age
-
Location
Imilchil, Morocco
Formation
Imilchil Mines
Size
85.6 mm   •    in
Weight
355 g   •    oz
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Description

 

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 (peralkaline) pegmatites and granites 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.

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