What are clays ? give the names and chemical formula of three common clays

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Some clay minerals may be expressed using ideal chemical formulas as the following:

Some clay minerals may be expressed using ideal chemical formulas as the following: 2SiO2·Al2O3·2H2O (kaolinite),

Some clay minerals may be expressed using ideal chemical formulas as the following: 2SiO2·Al2O3·2H2O (kaolinite), 4SiO2·Al2O3·H2O (pyrophyllite),

Some clay minerals may be expressed using ideal chemical formulas as the following: 2SiO2·Al2O3·2H2O (kaolinite), 4SiO2·Al2O3·H2O (pyrophyllite), 4SiO2·3MgO·H2O (talc),

Some clay minerals may be expressed using ideal chemical formulas as the following: 2SiO2·Al2O3·2H2O (kaolinite), 4SiO2·Al2O3·H2O (pyrophyllite), 4SiO2·3MgO·H2O (talc), and 3SiO2·Al2O3·5FeO·4H2O (chamosite).

Some clay minerals may be expressed using ideal chemical formulas as the following: 2SiO2·Al2O3·2H2O (kaolinite), 4SiO2·Al2O3·H2O (pyrophyllite), 4SiO2·3MgO·H2O (talc), and 3SiO2·Al2O3·5FeO·4H2O (chamosite). The SiO2 ratio in a formula is the key factor determining clay mineral types.

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