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Naujakasite & Arfvedsonite

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FDW65230

Naujakasite & Arfvedsonite

Ilimaussaq complex
Rare Mineral

Description Tabs

Description
Locality: 
Kvanefjeld, Ilímaussaq, Narsaq, Kujalleq, Greenland
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 2.5 × 2 cm
Description

Rare mineral, only known from the Ilimaussaq complex. Naujakasite forms almost uncountable white-beige, rhomb-shaped, crystals in shiny flakes up to 2mm.

Large densities of naujakasite crystals form the majority of the specimen with additional dark-green arfvedsonite.

Collected in 2008 on the steep slope of Mt.Kvanefjeld.

Mineral Data
What's on the rock

Naujakasite

Formula: 
(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26
Strunz: 
9.EG.10
Hardness: 
2.0 - 3.0
Type Locality: 
Naujakasik (Naajakasik), Tunulliarfik Fjord (Tunugdliarfik), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

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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