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Middendorfite Mineral Data
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General Middendorfite Information
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 Chemical Formula: |
K3Na2Mn5Si12(O,OH)36•2H2O |
| Composition: |
Molecular Weight = 1,408.07 gm |
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Potassium 8.44 % K 10.17 % K2O |
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Sodium 3.38 % Na 4.56 % Na2O |
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Calcium 0.09 % Ca 0.12 % CaO |
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Magnesium 0.10 % Mg 0.17 % MgO |
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Titanium 0.10 % Ti 0.17 % TiO2 |
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Manganese 19.31 % Mn 24.94 % MnO |
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Aluminum 0.11 % Al 0.22 % Al2O3 |
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Zinc 0.14 % Zn 0.17 % ZnO |
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Iron 0.52 % Fe 0.66 % FeO |
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Silicon 23.82 % Si 50.95 % SiO2 |
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Hydrogen 0.87 % H 7.74 % H2O |
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Oxygen 42.89 % O |
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Fluorine 0.23 % F 0.23 % F |
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- %
F -0.10 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
K3.04Na2.07Ca0.03Mn2+4.95Fe2+0.13Mg0.06Ti0.03Zn0.03Si11.94Al0.06O27.57(OH)8.26F0.17�1.92(H2O) |
| Environment: |
Found in a hydrothermal assemblage in Hilairite hyperperalkaline pegmatite. Related to ganophyllite- and stilpnomelane-group minerals |
| IMA Status: |
Approved IMA 2005 (Dana # Added) |
| Locality: |
Kirovskii apatite mine, Kukisvumchorr, Khibiny alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for A.F. von Middendorff (1815-1894), an outstanding scientist, who carried out the first mineralogical investigations in the Khibiny pluton. |
| Synonym: |
IMA2005-028 |
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