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The 15 clay minerals are mainly divided in to ________ groups.

(a) 3 groups

(b) 2 groups

(c) 9 groups

(d) 4 groups

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Question is from Clay Minerals topic in division Soil Structure and Clay Minerology of Geotechnical Engineering I

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Best answer
Correct option is (d) 4 groups

Best explanation: Clay minerals are classified into 3 groups of kaolin, montmorillonite, illite and palygorskite.

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