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Noncrystalline Fe-Si-Al-Oxyhydroxides

Published online by Cambridge University Press:  02 April 2024

Richard A. Eggleton
Richard A. Eggleton*
Affiliation:
Department of Geology, Australian National University, Canberra, ACT 2600, Australia
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Abstract

High-resolution transmission electron microscopy of noncrystalline Fe-Si-Al-oxyhydroxide gels shows a common structure of hollow packed spheres having external diameters ranging from 50 to 1000 Å. Some sphere walls display a concentric structure, particularly if the gel composition is close to that of a crystalline clay mineral (e.g., smectite, kaolin). The spheres probably formed by expansion of void space (bubbles) as the surrounding gel contracted 5–10% because of partial ordering of the Fe-Si-Al-oxygen network. Much of the water contained in such noncrystalline minerals is incorporated within the bubbles.

Keywords

GelsHigh-resolution transmission electron microscopyIronMorphologyNoncrystalline oxyhydroxides
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 1 , February 1987 , pp. 29 - 37
Copyright
Copyright © 1987, The Clay Minerals Society

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References

Banfield, J. F., 1985 Mineralogy and chemistry of granite weathering .Google Scholar
Chukhrov, F. W., Zvyagin, B. B., Ermilova, L. P., Gorshkov, A. I. and Serratosa, J. M., 1973 New data on iron oxides in the weathering zone Proc. Int. Clay Conf., Madrid, 1972 Madrid Div. Ciencas C.S.I.C. 333 – 341.Google Scholar
Colman, S. M. (1982) Chemical weathering of basalts and andesites: Evidence from weathering rinds: U.S. Geol. Surv. Prof. Pap. 1246, 51 pp.Google Scholar
Eggleton, R. A. and Buseck, D. R., 1980 High-resolution electron microscopy of feldspar weathering Clays & Clay Minerals 28 173 – 178.CrossRefGoogle Scholar
Eggleton, R. A. and Keller, J., 1982 The palagonitisation of limburgite glass—a TEM study N. Jb. Miner. Mh. Jg. 1982 321 – 336.Google Scholar
Eggleton, R. A., Pennington, T. H., Freeman, R. S. and Threadgold, I. M., 1983 Structural aspects of the hisingerite-neotocite series Clay Miner. 18 21 – 31.CrossRefGoogle Scholar
Eitel, W., 1964 Silicate Science VI: Silicate Structures New York Academic Press.Google Scholar
Henderson, P., 1982 Inorganic Geochemistry New York Pergamon Press.Google Scholar
Henmi, T. and Wada, K., 1976 Morphology and composition of allophane Amer. Mineral. 61 379 – 390.Google Scholar
Ildefonse, P., 1978 Mécanismes de l’altération d’une roche gabbroïque du Massif du Pallet (Loire Atlantique) .Google Scholar
Kirkman, J. H., 1977 Possible structure of halloysite disks and cylinders observed in some New Zealand rhyolitic tephras Clay Miner. 12 199 – 216.CrossRefGoogle Scholar
Kirkpatrick, R. J., 1983 Theory of nucleation in silicate melts Amer. Mineral. 68 66 – 67.Google Scholar
Parfitt, R. L. and Theng, B. K. G., 1980 Chemical properties of variably charged soils Soils with Variable Charge Lower Hutt, New Zealand Soil Bureau D.S.I.R. 167 – 194.Google Scholar
Parfitt, R. L. and Henmi, T., 1980 Structure of some al-lophanes from New Zealand Clays & Clay Minerals 28 285 – 294.CrossRefGoogle Scholar
Phillips, J. C. (1982) Spectroscopic and morphological structure of tetrahedral oxide glasses: Solid State Physics 37, 93 pp.CrossRefGoogle Scholar
Shayan, A., 1984 Hisingerite material from a basalt quarry near Geelong, Victoria, Australia Clays & Clay Minerals 32 272 – 278.CrossRefGoogle Scholar
Sudo, T., Shimoda, S., Yotsumoto, H. and Aita, S., 1981 Electron Micrographs of Clay Minerals Amsterdam Elsevier.Google Scholar
Tazaki, K., van Olphen, H. and Veniale, F., 1982 Analytical electron microscopical studies of halloysite formation processes—morphology and composition of halloysite Proc. Int. Clay Conf, Bologna, Pavia, 1981 Amsterdam Elsevier 573 – 584.Google Scholar
Wada, K., van Olphen, H. and Veniale, F., 1982 Amorphous/clay minerals—chemical composition, crystalline state, synthesis, and surface properties Proc. Int. Clay Conf, Bologna, Pavia, 1981 Amsterdam Elsevier 385 – 398.Google Scholar
Wada, S.-I. and Wada, K., 1977 Density and structure of allophane Clay Miner. 12 289.CrossRefGoogle Scholar
Webb, J. A. and Finlayson, B. L., 1984 Allophane and opal speleothems from granite caves in southeast Queensland Aust. J. Earth Sci. 31 341 – 349.CrossRefGoogle Scholar