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Jahnsite-(CaMgMg) Mineral Data
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General Jahnsite-(CaMgMg) Information
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 Chemical Formula: |
CaMgMg2Fe+++2(PO4)4(OH)2•8H2O |
| Composition: |
Molecular Weight = 782.71 gm |
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Calcium 5.12 % Ca 7.16 % CaO |
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Magnesium 9.32 % Mg 15.45 % MgO |
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Iron 14.27 % Fe 20.40 % Fe2O3 |
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Phosphorus 15.83 % P 36.27 % P2O5 |
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Hydrogen 2.32 % H 20.71 % H2O |
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Oxygen 53.15 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
CaMg3Fe3+2(PO4)4(OH)2•8(H2O) |
| Environment: |
Zoned tip on Jahnsite-(NaFeMg). Whiteite-jahnsite group. |
| IMA Status: |
Not Submitted IMA (Dana # Added) |
| Locality: |
Tip Top mine, Custer County, 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-(CaMgMg)  |
| Synonym: |
IMA2007-016 |
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