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Phyllosilicate(Clay)Minerals <br /> Illite &Mica <br /> Illite & Mica (muscovite) are common non-expanding (non-swelling) minerals. Illite is the fine- <br /> grained clay mineral analogue to muscovite. Illite and Mica are hydrated silicates containing <br /> potassium, silica and alumina. <br /> Kaolinite <br /> Kaolinite is a common non-expanding (non-swelling) clay mineral. It is a hydrous aluminum <br /> silicate with the general formula Al2(Si2O5)(OH)4. <br /> Chlorite <br /> Chlorite is a common non-expanding (non-swelling) clay mineral. It is a hydrous aluminum <br /> silicate that often contains iron. <br /> Mixed-La. e�y Minerals <br /> Clay mineral groups commonly containing Illite or Chlorite interlayered or interstratified with <br /> Smectite. The mixed-layer clay type is identified by the minerals involved, the type of order or <br /> stacking along the Z axis and the proportions of the minerals involved. <br /> Smectite Montmorillonite) <br /> A clay mineral group synonymous with the montmorillonite group. The smectite group is <br /> composed of expandable (swelling) clay minerals. The general formula for Smectite is <br /> (Na,Ca)(A1,Mg)6(Si4O1O)3(OH)6 • n H2O. Smectites are characterized by swelling in water and <br /> extreme colloidal behavior. <br /> Reference for general mineral definitions: Dictionary of Geological Terms, American Geological Institute, 1976, Anchor <br /> Press/Doubleday,Garden City,New York. <br /> K/T GeoServices Report Z23032 Page 4 of 10 February 17,2023 <br />