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Brammallite Mineral Data
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General Brammallite Information
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 Chemical Formula: |
(Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] |
| Composition: |
Molecular Weight = 391.86 gm |
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Sodium 3.87 % Na 5.22 % Na2O |
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Magnesium 3.72 % Mg 6.17 % MgO |
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Aluminum 13.77 % Al 26.02 % Al2O3 |
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Iron 1.43 % Fe 1.83 % FeO |
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Silicon 21.50 % Si 46.00 % SiO2 |
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Hydrogen 1.28 % H 11.47 % H2O |
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Oxygen 54.43 % O |
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______ ______ |
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100.00 % 96.71 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.66(H3O)0.33AlMg0.6Fe2+0.1Si3AlO10(OH)2�(H2O) |
| Environment: |
Believed to be a degradation product of paragonite. Group name for Interlayer-deficient clays. |
| IMA Status: |
Not Approved IMA 1998 |
| Locality: |
Landebie, Dyfed, Wales. Link to MinDat.org Location Data. |
| Name Origin: |
Named in 1943 for Alfred Brammall (1879-?), British gologist and mineralogist. |
| Name Pronunciation: |
Brammallite + Pronunciation  |
| Synonym: |
Hydroparagonite |
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Sodium hydromica |
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Sodium illite |
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