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Which of the following types of clay mineral includes potassium in the layer structure?

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in Casting-Forming-Welding I by (687k points)
Which of the following types of clay mineral includes potassium in the layer structure?

(a) Chlorite

(b) Vermiculite

(c) Illite

(d) Kaolinite

The question was asked in class test.

My question is taken from Fire Clays, Illite and Kaolinite in portion Molding and Core Sands of Casting-Forming-Welding I

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Correct option is (c) Illite

The explanation: Illite is a clay mineral which has potassium in the interlayer structure. The size and coordination number of potassium are like that it fits tightly in the hexagonal ring of oxygen of the tetrahedral sheets. This makes the structure a strong interlocking ionic bond which packs the individual layers together and restricts the water particles from immersing the interlayer site.

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