The relationship between allophane, an X-ray amorphous, short-range ordered aluminosilicate gel, found in soils derived from volcanic ash (Andosols) and the poorly ordered clay minerals present in the subsoils of podsols (Spodosols) developed on non-vitric parent materials is uncertain. The similarity of many of the physical and chemical properties of these soils has led to postulations that ‘allophane-like’ materials also occur in podsols1–4. The high chemical reactivity of allophane and its intimate association with both soil organic matter and crystalline phyllosilicates and oxides has meant that earlier studies have involved either the examination of mixed crystal-line–microcrystalline clay systems, or the use of dispersing reagents that would have caused at least the partial solution of any poorly ordered phases present. The established instrumental techniques of differential thermal analysis and IR absorption spectroscopy may be used to characterise allophanic materials, but only when they constitute virtually the whole of the clay fraction5. The present study characterises an allophane sample successfully isolated from a podsol profile.
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Structural studies of imogolite and allophanes by aluminum-27 and silicon-29 nuclear magnetic resonance spectroscopy
Physics and Chemistry of Minerals (1985)