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Common clays are usually mixtures of clay minerals such as illite, smectite , and kaolinite, together with fine silica and other minor constituents.
The lake may have dried up or nearly dried up periodically, producing outward concentric zones of albite, analcime, clinoptilolite, and smectite .
The clay is composed of illite and kaolinite, with minor amounts of chlorite and smectite .
The limestone-dolomite breccia is characterized by abundant palygorskite, minor sepiolite, rare kaolinite and near absence of smectite .
The clay mineral smectite , with physical properties that make it unsuitable as a soil if it is wet, is only found in major amounts in covered stadiums.
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