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Which one of the following is a 2:1 non-expanding clay mineral?
Question

Which one of the following is a 2:1 non-expanding clay mineral?

A.

Kaolinite

B.

Vermiculite

C.

Montmorillonite

D.

Illite

Correct option is D


Illite is a 2:1 clay mineral (two tetrahedral sheets sandwiching one octahedral sheet), but it is non-expanding due to the presence of potassium ions in the interlayer space. This distinguishes it from montmorillonite and vermiculite, which are expanding types.

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