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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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