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Jahnsite-(CaFeFe) Mineral Data
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General Jahnsite-(CaFeFe) Information
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 Chemical Formula: |
(Ca,Mn)(Fe++,Mn++)Fe++2Fe+++2(PO4)4(OH)2•8(H2O) |
| Composition: |
Molecular Weight = 851.41 gm |
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Calcium 2.82 % Ca 3.95 % CaO |
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Magnesium 2.28 % Mg 3.79 % MgO |
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Manganese 3.87 % Mn 5.00 % MnO |
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Aluminum 0.32 % Al 0.60 % Al2O3 |
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Iron 24.93 % Fe 16.03 % FeO / 17.82 % Fe2O3 |
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Phosphorus 14.55 % P 33.34 % P2O5 |
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Hydrogen 2.37 % H 21.16 % H2O |
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Oxygen 48.86 % O |
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______ ______ |
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100.00 % 101.69 % = TOTAL OXIDE |
| Empirical Formula: |
Ca0.6Mn2+0.6Fe2+1.9Mg0.8Fe3+1.9Al0.1(PO4)4�10(H2O) |
| Environment: |
Pliocene-Pleistocene clay deposits in vivianite nodules and secondary phosphates. |
| IMA Status: |
Not Approved IMA (Dana # Added) |
| Locality: |
Hime-Shima, Oita Prefecute and Kobe, Hyogo Prefecture, western Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA. |
| Name Pronunciation: |
Jahnsite-(CaFeFe)  |
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