Magnussonite

minerals

hausmannite

dixenite

kraisslite

Formula: Mn2+10As3+6O18(OH,Cl)2
Arsenite containing hydroxyl and/or halogen
Specific gravity: Greater than 4.4
Hardness: 3½ to 4
Streak: White
Colour: Grass reen to emerald green
Environments:

Metamorphic environments

Magnussonite occurs in a metamorphosed Fe-Mn orebody (Webmin).

Localities

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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