Naujakasite

naujakasite

arfvedsonite

steenstrupine-(Ce)

sodalite

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Formula: Na₆Fe²⁺Al₄Si₈O₂₆
Phyllosilicate (sheet silicate)
Crystal System: Monoclinic
Specific gravity: 2.615 to 2.622 measured, 2.661 calculated
Hardness: 2 to 3
Streak: Grey-white
Colour: Grey to silver-white, colourless in transmitted light
Common impurities: Ti,Mg,Ca,K,H₂O,P
Environments

Plutonic igneous environments

Localities

At the type locality, Naujakasik, Tunulliarfik Fjord, Ilímaussaq complex, Kujalleq, Greenland, naujakasite occurs in an alkalic intrusion, intimately associated with arfvedsonite (AM 20.138). Other associated minerals include steenstrupine-(Ce), sodalite and analcime (Mindat, HOM).

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