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Manjiroite Mineral Data
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General Manjiroite Information
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 Chemical Formula: |
(Na,K)(Mn++++,Mn++)8O16•n(H2O) |
| Composition: |
Molecular Weight = 739.94 gm |
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Potassium 1.06 % K 1.27 % K2O |
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Sodium 2.17 % Na 2.93 % Na2O |
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Manganese 57.91 % Mn 2.88 % MnO / 88.12 % MnO2 |
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Aluminum 0.36 % Al 0.69 % Al2O3 |
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Hydrogen 0.44 % H 3.90 % H2O |
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Oxygen 38.06 % O |
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______ ______ |
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100.00 % 99.78 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.7K0.2Mn4+7.5Mn2+0.3Al0.1O16•1.6(H2O) |
| Environment: |
Oxidation zone of metamorphosed bedded manganese deposits. |
| IMA Status: |
Approved IMA 1967 |
| Locality: |
Kohare, Tachikawa, Kotamagawa, Kawai, and Takinosawa mines, Iwate Prefecture, Japan. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Manjiro Watanabe (1891-?), Emeritus Professor of Mineralogy, Tohoku University, Sendai, Japan. |
| Name Pronunciation: |
Manjiroite + Pronunciation  |
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