Imogolite: a unique aluminosilicate

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<jats:p>The fibrous aluminosilicate imogolite has been studied by electronoptical and infrared absorption methods. Electron diffraction patterns are interpreted in terms of repeat units of 8·4 Å parallel and 23 Å perpendicular to the fibre axis. These spacings can not be reconciled with a continuous silicate chain structure and this conclusion is supported by an Si-O vibration near 930 cm<jats:sup>−1</jats:sup>. A structure is postulated in which distorted chains of Al-O octahedra are cross-linked through isolated Si<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub> groups.</jats:p><jats:p>Multiple OH stretching vibrations indicate different types of OH group in the imogolite structure. Absorption bands near 1000, 700 and 600 cm<jats:sup>−1</jats:sup> are sensitive to sample orientation. This is attributed to the morphology and dimensions of the imogolite fibres.</jats:p>

Journal

  • Clay Minerals

    Clay Minerals 8 (1), 87-99, 1969-07

    Mineralogical Society

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