F. CORNU11 proposed a very interesting theory to explain at least some of the gel minerals. He took, for example, aluminium hydroxide and passed into it dilute phosphoric acid. The resulting mass was a jelly consisting of aluminium hydroxide and adsorbed phosphoric acid. From a consideration of this reaction he proposed that, by a succession of adsorptions, various gel minerals may be produced in nature. These he designated as primary, secondary, tertiary and quaternary gel minerals. A series of this kind he believed to be represented in nature by:

    2Fe2O3+3H2O (stilpnosiderite)
    2Fe2O3+P2O5+Aq. (delvauxite)
    2Fe2O3+P2O5+2SO3+Aq. (diadochite)

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