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Jahnsite-(CaMnMg) Mineral Data
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General Jahnsite-(CaMnMg) Information
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 Chemical Formula: |
CaMnMg2Fe+++2(PO4)4(OH)2•8(H2O) |
| Composition: |
Molecular Weight = 813.34 gm |
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Calcium 4.93 % Ca 6.89 % CaO |
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Magnesium 5.98 % Mg 9.91 % MgO |
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Manganese 6.75 % Mn 8.72 % MnO |
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Iron 13.73 % Fe 19.63 % Fe2O3 |
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Phosphorus 15.23 % P 34.90 % P2O5 |
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Hydrogen 2.23 % H 19.93 % H2O |
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Oxygen 51.15 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
CaMn2+Mg2Fe3+2(PO4)4(OH)2•8(H2O) |
| IMA Status: |
Approved IMA 1974 |
| Locality: |
Tip Top pegmatite, Custer, South Dakota, USA. 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-(CaMnMg)  |
| Synonym: |
Jahnsite |
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