General Oneillite Information
|
 Chemical Formula: |
Na15Ca3Mn3Fe++3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2 |
| Composition: |
Molecular Weight = 3,128.56 gm |
| |
Sodium 11.02 % Na 14.86 % Na2O |
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Calcium 3.84 % Ca 5.38 % CaO |
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Zirconium 8.75 % Zr 11.82 % ZrO2 |
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Manganese 5.27 % Mn 6.80 % MnO |
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Niobium 2.97 % Nb 4.25 % Nb2O5 |
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Iron 5.36 % Fe 6.89 % FeO |
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Silicon 22.44 % Si 48.01 % SiO2 |
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Hydrogen 0.10 % H 0.89 % H2O |
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Chlorine 0.57 % Cl 0.57 % Cl |
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- %
Cl -0.13 % -O=Cl2 |
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Oxygen 39.68 % O |
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______ ______ |
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100.00 % 99.34 % = TOTAL OXIDE |
| Empirical Formula: |
Na15Ca3Mn2+3Fe2+3Zr3NbSi25O74.8(OH)2.5(H2O)0.3Cl0.5 |
| Environment: |
Found in nepheline syenite at the contact between a vein of fine-grained albite and the host rock. A member of the Eudialyte group. |
| IMA Status: |
Approved IMA 1998 (Dana # Added) |
| Locality: |
Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named after John Johnston O�Neill (1886-1966), geologist with the Geological Survey of Canada, Ottawa, and later, Professor of geology, Dean of Science and Dean of Engineering at Mc Gill University, Montreal, Canada. |
| Synonym: |
IMA1998-064 |
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