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Fluoro-magnesio-arfvedsonite

Variety of Arfvedsonite where magnesium partially replaces one the iron, and where fluorine partially replaces the hydroxyl and dominates it. Fluro-magnesio-arfvedsonite is recognized by the IMA as a distinct mineral species with the following chemical formula: NaNa2(Mg,Fe2+)4Fe3+Si8O22(F,OH)2

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