Mineralogy Database

Jacobsite Mineral Data

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General Jacobsite Information

Help on Chemical Formula: Chemical Formula: (Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4
Help on Composition: Composition: Molecular Weight = 227.38 gm
   Magnesium   1.07 %  Mg    1.77 % MgO
   Manganese  26.58 %  Mn   18.72 % MnO / 17.36 % Mn2O3
   Iron       44.21 %  Fe    9.48 % FeO / 52.67 % Fe2O3
   Oxygen     28.15 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+0.6Fe2+0.3Mg0.1Fe3+1.5Mn3+0.5O4
Help on Environment: Environment: A primary mineral or and alteration product of othe rmanganese-bearing minerals in some metamorphosed Mn deposits. Dimorphous with iwakiite and forms a series with magnetite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1869
Help on Locality: Locality: Jakobsberg, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Jacobsite + Pronunciation Say JACOBSITE
Help on Synonym: Synonym: ICSD 28517
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