| Reference Type | Journal (article/letter/editorial) |
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| Title | Hydroxylian pseudorutile derived from picroilmenite in the Murray Basin, southeastern Australia |
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| Journal | Mineralogical Magazine |
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| Authors | Grey, I. E. | Author |
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| Li, C. | Author |
| Year | 2003 (August) | Volume | 67 |
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| Page(s) | 733-747 | Issue | 4 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/0026461036740130Search in ResearchGate |
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| Mindat Ref. ID | 243460 | Long-form Identifier | mindat:1:5:243460:9 |
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| GUID | 6f4d2762-9b48-4883-8824-16262045dee7 |
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| Full Reference | Grey, I. E., Li, C. (2003) Hydroxylian pseudorutile derived from picroilmenite in the Murray Basin, southeastern Australia. Mineralogical Magazine, 67 (4) 733-747 doi:10.1180/0026461036740130 |
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| Plain Text | Grey, I. E., Li, C. (2003) Hydroxylian pseudorutile derived from picroilmenite in the Murray Basin, southeastern Australia. Mineralogical Magazine, 67 (4) 733-747 doi:10.1180/0026461036740130 |
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| Abstract/Notes | AbstractIlmenite concentrates obtained from heavy mineral deposits in the Murray Basin, southeastern Australia contain appreciable quantities (up to 10 wt.%) of an unusual hydrated Fe titanate mineral in the form of orange to red coloured translucent grains. The grains are weakly magnetic and have a low apparent density (<3.3 g cm–3) due to microprosity, which enables them to be easily concentrated in a pure state. Samples from different deposits have similar analyses of 67–69% TiO2, 8 –9% Fe2O3, 2–3% FeO, 11 –12% H2O and 8 –9% of intra-pore impurities, mainly SiO2 and Al2O3. The powder pattern for the mineral closely matches that for pseudorutile; having a hexagonal subcell with a = 2.844 (1) Å, c = 4.575 (1) Å. The idealized composition range of the Fe titanate, calculated from analyses and structure refinements, is [FeTi6O12(OH)3].3H2O to [FeTi6O11(OH)5].2H2O. The molecular water is nonstructural, probably adsorbed on the surfaces of nano-scale domains of the mineral. Electron microprobe and scanning electron microscopy studies provide evidence for formation of the mineral by replacement reactions acting on MgO-rich ferrian ilmenite grains. The mineral represents a distinct intermediate in the chemical weathering of ilmenite, having a pseudorutile-like structure but a leucoxene-like composition. It is unusual in not having undergone any recrystallization to phases such as rutile and anatase. |
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