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Arfvedsonite

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