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What is the composition of Kaolinite?

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in Chemistry – Class 12 by (188k points)
What is the composition of Kaolinite?

(a) Fe2O3

(b) Al2O3.2H2O

(c) [Al2(OH)4Si2O4]

(d) CuFeS2

This question was addressed to me during an online interview.

This intriguing question originated from Occurrence of Metals in chapter General Principles and Processes of Isolation of Elements of Chemistry – Class 12

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Right answer is (c) [Al2(OH)4Si2O4]

The best explanation: Kaolinite is a soft clay type material with the chemical composition [Al2(OH)4Si2O4]. It’s basically made up of hydrous aluminium silicates, they comprise the principle ingredients of kaolin (china clay). It is usually white in appearance and sometimes red due to iron oxide.

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