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Tetraferriannite Mineral Data
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General Tetraferriannite Information
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 Chemical Formula: |
K(Fe++,Mg)3(Fe+++,Al)Si3O10(OH)2 |
| Composition: |
Molecular Weight = 517.76 gm |
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Potassium 7.55 % K 9.10 % K2O |
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Magnesium 2.35 % Mg 3.89 % MgO |
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Aluminum 1.30 % Al 2.46 % Al2O3 |
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Iron 35.06 % Fe 34.69 % FeO / 11.57 % Fe2O3 |
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Silicon 16.27 % Si 34.81 % SiO2 |
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Hydrogen 0.39 % H 3.48 % H2O |
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Oxygen 37.08 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
KFe2+2.5Mg0.5Fe3+0.75Al0.25Si3O10(OH)2 |
| Environment: |
Metamorphosed banded-iron formation. |
| IMA Status: |
Renamed IMA 1998 Formerly ferri-annite |
| Locality: |
Dales George member, Hammersley group, Wittenoom, WA, Australia. Link to MinDat.org Location Data. |
| Name Origin: |
Named in 1963 for the composition and relationship to annite. Renamed to Tetra-ferri-annite. |
| Synonym: |
Ferri-annite |
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Ferriannite |
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Ferribiotite |
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Monrepite |
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Tetra-ferri-annite - Renamed Tetraferriannite by Mineralogical Record, v39 (2008), p131 |
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