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Iddingsite Mineral Data
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General Iddingsite Information
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 Chemical Formula: |
MgO.Fe2O3.3SiO2•4(H2O) |
| Composition: |
Molecular Weight = 452.31 gm |
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Magnesium 5.37 % Mg 8.91 % MgO |
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Iron 24.69 % Fe 31.77 % FeO |
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Silicon 18.63 % Si 39.85 % SiO2 |
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Hydrogen 1.78 % H 15.93 % H2O |
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Oxygen 49.52 % O |
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______ ______ |
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100.00 % 96.46 % = TOTAL OXIDE |
| Empirical Formula: |
MgFe2+2Si3O10•4(H2O) |
| Environment: |
Alteration of olivine. Iddinsite is a mixture of various hydrous silicates of iron and magnesium. |
| IMA Status: |
Discredited IMA 1966 - Valid Species (Pre-IMA) 1925 |
| Locality: |
Link to MinDat.org Location Data. |
| Name Origin: |
Named for Joseph Paxson Iddings (1857-1920), American petrologist, U.S. Geological Survey. |
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