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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) VermiculiteI 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

Answer»

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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