| Reference Type | Journal (article/letter/editorial) |
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| Title | Evidence for loss of protons and octahedral iron from oxidized biotites and vermiculites |
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| Journal | Mineralogical Magazine |
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| Authors | Farmer, V. C. | Author |
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| Russell, J. D. | Author |
| McHardy, W. J. | Author |
| Newman, A. C. D. | Author |
| Ahlrichs, J. L. | Author |
| Rimsaite, J. Y. H. | Author |
| Year | 1971 (June) | Volume | 38 |
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| Issue | 294 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_38/38-294-121.pdf+ |
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| DOI | doi:10.1180/minmag.1971.038.294.01Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6452 | Long-form Identifier | mindat:1:5:6452:5 |
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| GUID | 0 |
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| Full Reference | Farmer, V. C., Russell, J. D., McHardy, W. J., Newman, A. C. D., Ahlrichs, J. L., Rimsaite, J. Y. H. (1971) Evidence for loss of protons and octahedral iron from oxidized biotites and vermiculites. Mineralogical Magazine, 38 (294) 121-137 doi:10.1180/minmag.1971.038.294.01 |
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| Plain Text | Farmer, V. C., Russell, J. D., McHardy, W. J., Newman, A. C. D., Ahlrichs, J. L., Rimsaite, J. Y. H. (1971) Evidence for loss of protons and octahedral iron from oxidized biotites and vermiculites. Mineralogical Magazine, 38 (294) 121-137 doi:10.1180/minmag.1971.038.294.01 |
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| In | (1971, June) Mineralogical Magazine Vol. 38 (294) Mineralogical Society |
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| Abstract/Notes | SummaryInfra-red examination of a weathered biotite and of biotites that have been converted to vermiculites and subsequently oxidized, indicates that oxidation of octahedral ferrous ions to ferric ions is associated with a reversible conversion of hydroxyl ions to oxide ions. Subsequently, in high-iron biotites, there is an irreversible loss of ferric ions from the octahedral layer, resulting in an increased number of dioctahedral sites. Electron microscopy and X-ray diffraction indicate that ejected ferric ions form either amorphous interlayer oxides or, when bromine is used as an oxidant, a crystalline external phase of β-FeOOH. The high refractive index of some oxidized vermiculites is shown to be due largely to submicroscopic iron oxides. |
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