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Formula: Mn2+10As3+6O18(OH,Cl)2
Arsenite containing hydroxyl and/or halogen,
manganese-bearing mineral
Crystal System: Isometric
Specific gravity: 4.14 to 4.49 measured, 4.55 calculated
Hardness: 3½ to 4
Streak: White
Colour: Grass green to emerald green
Environments:
Magnussonite occurs in a metamorphosed
iron-manganese 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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