Allophane and imogolite are common alteration products of volcanic materials. Natural and
synthetic allophanes and imogolites were characterized in the present study in order to�…

Despite half a century of intensive research, the structure and presence of short-range
ordered aluminosilicates in volcanic soils is still the focus of debate. Imogolite is easily�…

To resolve the existing ambiguities in the interpretation of the OH-stretching vibrations of
kaolinites, relationships were, for the first time, established between the structural and�…

Sixteen clay samples separated from different weathered volcanic ashes and pumices were
studied by electron microscopy, chemical analysis, infrared spectroscopy, and X-ray�…

Dioctahedral smectite samples of a wide range of compositions (beidellites,
montmorillonites, nontronites, Fe-rich montmorillonites and Al-rich nontronites) were studied�…

The aim of this paper is to determine a relationship between the wavenumbers of the first OH-
stretching overtones (W 2νOH) and the wavenumbers of the OH-stretching fundamentals (W�…

Volcanic ash soils were studied with the scanning electron microscope to observe the
morphology and occurrence of allophane, imogolite and halloysite. Allophane and imogolite�…

Samples containing allophane with molar Al/Si ratios from 1.0 to 2.0 have been examined by
infrared spectroscopy, X-ray fluorescence, and phosphate adsorption methods. The infrared�…

Publisher Summary Allophane is considered collectively to constitute noncrystalline hydrous
aluminosilicates, and imogolite is a unique paracrystalline aluminosilicate. These minerals�…

The structural changes of synthetic beidellite and Al13-pillared analogues during
dehydroxylation were studied using infrared emission spectroscopy (IES). The OH-stretching�…