| Reference Type | Journal (article/letter/editorial) |
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| Title | An occurrence of a fully-oxidized natural titanomaghemite in basalt |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Allan, Jaoqueline E. M. | Author |
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| Coey, J. M. D. | Author |
| Sanders, I. S. | Author |
| Schwertmann, U. | Author |
| Friedrich, G. | Author |
| Wiechowski, A. | Author |
| Year | 1989 (June) | Volume | 53 |
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| Issue | 371 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_53/53-371-299.pdf+ |
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| DOI | doi:10.1180/minmag.1989.053.371.04Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1506 | Long-form Identifier | mindat:1:5:1506:0 |
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| GUID | 0 |
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| Full Reference | Allan, Jaoqueline E. M., Coey, J. M. D., Sanders, I. S., Schwertmann, U., Friedrich, G., Wiechowski, A. (1989) An occurrence of a fully-oxidized natural titanomaghemite in basalt. Mineralogical Magazine, 53 (371) 299-304 doi:10.1180/minmag.1989.053.371.04 |
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| Plain Text | Allan, Jaoqueline E. M., Coey, J. M. D., Sanders, I. S., Schwertmann, U., Friedrich, G., Wiechowski, A. (1989) An occurrence of a fully-oxidized natural titanomaghemite in basalt. Mineralogical Magazine, 53 (371) 299-304 doi:10.1180/minmag.1989.053.371.04 |
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| In | (1989, June) Mineralogical Magazine Vol. 53 (371) Mineralogical Society |
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| Abstract/Notes | AbstractTitanomaghemite occurs in a relatively fresh doleritic intrusion in an area of Precambrian gneiss in Minas Gerais, Brazil. It hosts exsolution lamellae of ilmenite and contains more than 90% of the iron in the ferric form. It is more resistant to weathering than the ilmenite and is inherited virtually unaltered by the resulting soils. Titanomaghemite, extracted as grains from a weathered rind of the rock, has lattice parameter a0 = 0.8348(3) nm and has a canted spin structure due to substitution of non-magnetic ions on tetrahedral and octahedral sites of the spinel structure. The average canting angle is 32 ± 3° and canting occurs predominantly on the octahedral iron sublattice. Its formula, based on microprobe analysis and Mössbauer spectroscopy may be expressed as:where ◻ and {} denote ions on tetrahedral and octahedral sites, respectively. The spontaneous magnetization of the mineral is 36(3) J/T/kg. |
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