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Which of the following members of clay minerals is formed by the decompositions of micas?

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Which of the following members of clay minerals is formed by the decompositions of micas?

(a) Chlorite

(b) Illite

(c) Kaolinite

(d) Vermiculite

I got this question in semester exam.

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

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The correct choice is (d) Vermiculite

Easiest explanation: Vermiculite is a very important and essential member of clay minerals which is normally formed by the decompositions of micas and occurs as completely large crystals of mica like appearance. It has a layer structure which basically consists of water particles and exchangeable cations which are mainly magnesium ions.

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