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Arfvedsonite

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PDM719806

Arfvedsonite

Description Tabs

Description
Locality: 
Mount Malosa, Zomba, Southern Region, Malawi
Class: 
Single Crystal
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.7 × 0.6 × 0.4 cm
Description

Black prismatic crystal with minor white feldspar. I found this in a box with aegirine crystals when preparing thin sections for students in the Complutense University of Madrid. The microscope confirmed that this type of crystals is not aegirine but arfvedsonite.

Mineral Data
What's on the rock

Arfvedsonite

Formula: 
[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Strunz: 
9.DE.25
Hardness: 
5.0 - 6.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

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