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Neptunite Mineral Data
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General Neptunite Information
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 Chemical Formula: |
KNa2Li(Fe++,Mn)2Ti2Si8O24 |
| Composition: |
Molecular Weight = 907.69 gm |
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Potassium 4.31 % K 5.19 % K2O |
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Sodium 5.07 % Na 6.83 % Na2O |
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Lithium 0.76 % Li 1.65 % Li2O |
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Titanium 10.55 % Ti 17.60 % TiO2 |
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Manganese 3.03 % Mn 3.91 % MnO |
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Iron 9.23 % Fe 11.87 % FeO |
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Silicon 24.75 % Si 52.96 % SiO2 |
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Oxygen 42.30 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
KNa2LiFe2+1.5Mn2+0.5Ti2Si8O24 |
| IMA Status: |
Valid Species (Pre-IMA) 1893 |
| Locality: |
Benitoite mine, San Benito, Co., California, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Neptune, the Roman god of the sea, because it was found with aegirine, named for the Scandinavian god of the sea. |
| Name Pronunciation: |
Neptunite + Pronunciation  |
| Synonym: |
Carlosite |
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ICSD 71360 |
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PDF 43-677 |
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