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Johninnesite Mineral Data
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General Johninnesite Information
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 Chemical Formula: |
Na2Mg4Mn++12(AsO4)2(Si12O35)(OH)6 |
| Composition: |
Molecular Weight = 2,079.34 gm |
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Sodium 2.21 % Na 2.98 % Na2O |
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Magnesium 4.68 % Mg 7.75 % MgO |
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Manganese 31.71 % Mn 40.94 % MnO |
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Silicon 16.21 % Si 34.67 % SiO2 |
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Arsenic 7.21 % As 11.05 % As2O5 |
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Hydrogen 0.29 % H 2.60 % H2O |
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Oxygen 37.70 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Na2Mg4Mn2+12(AsO4)2Si12O35(OH)6 |
| Environment: |
In low temperature hydrothermal veins cutting metamophosed Fe-Mn ores. |
| IMA Status: |
Approved IMA 1986 |
| Locality: |
Kombat mine, located 37 km east of Otavi and 49 km south of Tsumeb in the north-central part of Namibia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for John Innes, mineralogist of the Tsumeb Corporation, for his contributions to the mineralogy of the Tsumeb and Kombat mines. |
| Name Pronunciation: |
Johninnesite + Pronunciation  |
| Synonym: |
ICSD 75306 |
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PDF 39-402 |
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