Mineralogy Database

Jahnsite-(NaFeMg) Mineral Data

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General Jahnsite-(NaFeMg) Information

Help on Chemical Formula: Chemical Formula: NaFe+++Mg2Fe+++2(PO4)4(OH)2•8H2O
Help on Composition: Composition: Molecular Weight = 780.46 gm
   Sodium       2.12 %  Na    2.86 % Na2O
   Calcium      0.26 %  Ca    0.36 % CaO
   Magnesium    6.26 %  Mg   10.38 % MgO
   Manganese    0.28 %  Mn    0.36 % MnO
   Iron        19.46 %  Fe   27.83 % Fe2O3
   Phosphorus  15.87 %  P    36.37 % P2O5
   Hydrogen     2.44 %  H    21.84 % H2O
   Oxygen      53.30 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.72Ca0.05Mn2+0.04Fe3+0.72Mg0.01Mg2Fe3+24(P)4(O3.77)4(OH)0.23(OH)2�8(H2O)
Help on Environment: Environment: Found in a single football-sized rock, consisting mainly of heterosite and presumed to be a fragment of highly altered and oxidized triphylite. Whiteite-jahnsite group.
Help on IMA Status: IMA Status: Approved IMA 2007 (Dana # Added)
Help on Locality: Locality: Tip Top mine, Custer County, South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA.
Help on Name Pronunciation: Name Pronunciation: Jahnsite-(NaFeMg) Say JAHNSITE-(NAFEMG)
Help on Synonym: Synonym: IMA2007-016