Clay minerals are light silicates that form from molten rock from chemical weathering of igneous rocks from pressure and heat. from mechanical weathering of any rock

From chemical weathering of igneous rocks

Explanation: Clay minerals are the minerals that are a type of combination of light silicates having very minute size of particle and sheet like form. They mostly contain magnesium and aluminium as major component .They get formed in a long period of time as chemical weathering of the igneous rocks takes time by using silicates and some solvent with low dilution.

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