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Ferriwinchite Mineral Data
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General Ferriwinchite Information
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 Chemical Formula: |
([ ],Na)(Na,Ca)2(Mg, Fe++)4Fe+++[Si8O22](OH)2 |
| Composition: |
Molecular Weight = 845.75 gm |
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Potassium 0.42 % K 0.50 % K2O |
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Sodium 3.89 % Na 5.24 % Na2O |
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Calcium 3.70 % Ca 5.17 % CaO |
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Magnesium 8.65 % Mg 14.34 % MgO |
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Titanium 0.06 % Ti 0.09 % TiO2 |
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Manganese 0.58 % Mn 0.75 % MnO |
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Aluminum 0.61 % Al 1.15 % Al2O3 |
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Iron 12.48 % Fe 7.22 % FeO / 9.82 % Fe2O3 |
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Silicon 25.94 % Si 55.48 % SiO2 |
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Hydrogen 0.09 % H 0.80 % H2O |
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Oxygen 43.04 % O |
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Fluorine 0.56 % F 0.56 % F |
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- %
F -0.24 % -O=F2 |
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______ ______ |
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100.00 % 100.90 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.21K0.09Ca0.78Na1.22Mg3.01Mn2+0.09Fe2+0.85Ti0.01Fe3+1.04Si7.81Al0.19O22(OH)0.75F0.25 |
| Environment: |
One of many amphibole-group minerals in late veins in the fenite halo of the Ilmen Mountains alkaline complex. |
| IMA Status: |
Approved IMA 1978 |
| Locality: |
Ilmen Mountains alkaline complex, Southern Urals. Link to MinDat.org Location Data. |
| Name Origin: |
Named as the Fe+++ analoge of winchite. |
| Synonym: |
IMA2004-034 |
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