Arsenite containing hydroxyl and/or halogen
Specific gravity: Greater than 4.4
Hardness: 3½ to 4
Colour: Grass reen to emerald green
Magnussonite occurs in a metamorphosed Fe-Mn orebody
At the type locality, Långban, Filipstad, Värmland, Sweden, magnussonite occurs as fine-grained encrustations in fissures in dolomite impregnated with hausmannite or in fine-grained hematite, associated with trigonite, dixenite, calcite (Mindat, AM 42.581), dolomite, hausmannite, hematite and manganiferous serpentine (HOM).
At the Brattfors mine, Sweden, magnussonite is associated with katoptrite, sonolite, hausmannite, manganosite and magnetite (HOM).
At Sterling Hill, New Jersey, USA, magnussonite occurs very rarely in a metamorphosed stratiform zinc orebody, associated with zincite, willemite, franklinite and kraisslite (HOM, AM69.800).
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