Mineralogy Database

Magnussonite Mineral Data

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General Magnussonite Information

Help on Chemical  Formula: Chemical Formula: Mn++5As+++3O9(OH,Cl)
Help on Composition: Composition: Molecular Weight = 665.07 gm
   Manganese  41.30 %  Mn   53.33 % MnO
   Arsenic    33.80 %  As   44.62 % As2O3
   Hydrogen    0.11 %  H     1.02 % H2O
   Chlorine    1.33 %  Cl    1.33 % Cl
                -   %   Cl   -0.30 % -O=Cl2   
   Oxygen     23.46 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+5As3O9(OH)0.75Cl0.25
Help on Environment: Environment: In a metamorphosed Fe-Mn orebody.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1956
Help on Locality: Locality: Langban, Varmland, and in the Brattfors mine, Nordmark, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Nils Harald Magnusson (1890-1976), formerly Director, Geological Survey of Sweden, for his contributions to knowledge of the Langban mine.
Help on Name Pronunciation: Name Pronunciation: Magnussonite + Pronunciation Say MAGNUSSONITE
Help on Synonym: Synonym: ICSD 100494
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