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illite

A general term for a group of three-layer (14Aa), micalike clays (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10((OH)2,H2O) ; widely distributed in argillaceous sediments and derived soils; intermediate in composition and structure between muscovite and montmorillonite; contains less potassium and more water than muscovite, but more potassium than kaolinite or montmorillonite; potassium is generally replaced by calcium and/or magnesium; named from studies by Grimm of shales and clays in Illinois. Compare: pholidoide; phyllite.

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  • ed.young
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