Mineralogy Database

Janggunite Mineral Data

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General Janggunite Information

Help on Chemical Formula: Chemical Formula: Mn++++5-x(Mn++,Fe+++)1+xO8(OH)6, x = 0,2
Help on Composition: Composition: Molecular Weight = 559.85 gm
   Manganese  56.92 %  Mn   12.67 % MnO / 74.54 % MnO2
   Iron        2.00 %  Fe    2.85 % Fe2O3
   Hydrogen    1.08 %  H     9.65 % H2O
   Oxygen     40.01 %  O
             ______        ______ 
             100.00 %       99.71 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn4+4.8Mn2+Fe3+0.2O8(OH)6
Help on Environment: Environment: In the zone of supergene manganese oxides.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Janggun mine, Bonghwa, Korea. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Janggunite + Pronunciation Say JANGGUNITE