Arfvedsonite : [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Aegirine : NaFe3+Si2O6
As recorded:
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Photo added to mindat.org
“This 80 mm specimen shows that black is beautiful. From frozen pocket in Nepheline syenite winter 2003. Aegirine is the narrow pointy bundle on the left of center.”
Jonathan Zvonko Levinger - 2nd November 2007
Photo added to mindat.org
“This 80 mm specimen shows that black is beautiful. From frozen pocket in Nepheline syenite winter 2003. Aegirine is the narrow pointy bundle on the left of center.”
Jonathan Zvonko Levinger - 17th February 2011
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